The Experts below are selected from a list of 3009 Experts worldwide ranked by ideXlab platform
Zhao-zhu Zhang - One of the best experts on this subject based on the ideXlab platform.
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POSS grafted hybrid-fabric composites with a biomimic middle layer for simultaneously improved UV resistance and tribological properties
Composites Science and Technology, 2018Co-Authors: Junya Yuan, Xuehu Men, Zhao-zhu Zhang, Wenjing Wang, Mingming Yang, Wei-min LiuAbstract:Poor interfacial adhesion and inferior UV resistance severely inhibit the development of hybrid Meta-aramid/Polytetrafluoroethylene (Nomex/PTFE) fabric composites for distinguished solid self-lubrication materials, especially under high exterior load and long-term UV irradiation conditions. Herein, glycidyl polyhedral oligomeric silesquioxanes (POSS) nanoparticles are covalently grafted onto the hybrid Nomex/PTFE fabric with a polydopamine/polyethylenimine (PDA/PEI) intermediate layer. The microstructure and chemical characteristics of Nomex and PTFE fibers before and after modification are investigated and the results manifest an obvious increase in surface functional groups and roughness, as well as resin compatibility. Tensile and peeling testing results show that the obtained fabric composites, denoted as hybrid-fabric@PDA/PEI-POSS composites, exhibit 24.3% and 46.8% enhancements in tensile and interfacial bonding strength without discernable decrease in pristine hybrid-fabric strength. In addition, the PDA/PEI-POSS hierarchical coating imparts the hybrid-fabric with excellent UV-shielding properties. As a result, the tribological performance of hybrid-fabric@PDA/PEI-POSS composites presents an obvious improvement under high load and UV irradiation conditions.
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Surface modification of hybrid-fabric composites with amino silane and polydopamine for enhanced mechanical and tribological behaviors
Tribology International, 2017Co-Authors: Junya Yuan, Xuehu Men, Fang Guo, Zhao-zhu Zhang, Mingming Yang, Wei-min LiuAbstract:The poor interfacial adhesion between hybrid Nomex/PTFE fabric surfaces and polymer materials caused intrinsically by chemical inertness of Nomex and PTFE fibers severely inhibits the further application of hybrid Nomex/PTFE fabric composites. In this study, amino functionalized silane layer (KH550) was immobilized covalently onto hybrid Nomex/PTFE fabric surfaces using bio-inspired polydopamine (PDA) as a bridge to introduce substantial amino groups onto the fabric surfaces. The successful grafting of KH550 on the PDA-coated hybrid fabric surfaces was confirmed by FTIR, XPS and SEM. As a result, the tensile and bonding strength of the amino-functionalized fabric composite were obviously superior to those of the non-treated and polydopamine-coated only, which indicated that the introduction of amino functional layer brought about considerable improvement in interfacial compatibility of hybrid Nomex/PTFE fabric with the phenolic resin matrix. Besides, wear tests also showed the modified fabric composite exhibited the optimal tribological properties under varied test conditions. Most significantly, the strategy presented in this study is substrate-independent along with considerable flexibility to introduce various functional groups, suggesting promising applications for easily improving the interfacial compatibility of reinforcements with polymer matrix.
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Effect of ZrB2 particles incorporation on high-temperature tribological properties of hybrid PTFE/Nomex fabric/phenolic composite
Tribology International, 2016Co-Authors: Mingming Yang, Junya Yuan, Zhao-zhu ZhangAbstract:Abstract The thermal stability of polymer matrix composite could effectively improve by incorporation of highly thermally conductive ceramic materials into polymers. In present work, hybrid PTFE/Nomex fabric/phenolic composite specimens were prepared with zirconium diboride (ZrB 2 ) particles for the improvement its high-temperature tribological performances. The thermal stability of hybrid PTFE/Nomex fabric/phenolic composite was investigated by TGA. The result showed that the thermal stability was improved because of addition of ZrB 2 particles. In addition, it was found that 9 wt% ZrB 2 reinforced hybrid PTFE/Nomex fabric/phenolic composite exhibited optimal tribological performances compared to unfilled fabric composite under all test conditions.
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effect of zrb2 particles incorporation on high temperature tribological properties of hybrid ptfe Nomex fabric phenolic composite
Tribology International, 2016Co-Authors: Mingming Yang, Junya Yuan, Zhao-zhu ZhangAbstract:Abstract The thermal stability of polymer matrix composite could effectively improve by incorporation of highly thermally conductive ceramic materials into polymers. In present work, hybrid PTFE/Nomex fabric/phenolic composite specimens were prepared with zirconium diboride (ZrB 2 ) particles for the improvement its high-temperature tribological performances. The thermal stability of hybrid PTFE/Nomex fabric/phenolic composite was investigated by TGA. The result showed that the thermal stability was improved because of addition of ZrB 2 particles. In addition, it was found that 9 wt% ZrB 2 reinforced hybrid PTFE/Nomex fabric/phenolic composite exhibited optimal tribological performances compared to unfilled fabric composite under all test conditions.
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A biomimetic approach to improving tribological properties of hybrid PTFE/Nomex fabric/phenolic composites
European Polymer Journal, 2016Co-Authors: Mingming Yang, Junya Yuan, Kun Wang, Zhao-zhu ZhangAbstract:Abstract Interfacial strength between reinforcement and polymer matrix and dispersion of lubricant fillers in polymer composites are vital properties in determining the mechanical behaviors and tribological performance. In this work, a facile biomimetic method was employed to improve the interfacial strength between hybrid PTFE/Nomex fabric and phenolic resin as well as the dispersion of carbon carbonaceous in phenolic composite. Dopamine is the main component of mussel adhesive proteins which can easily attach on substrate surface by self-polymerization under weak basic buffer solution. Hence, polydopamine modified graphene oxide (D-rGO) and multi-walled carbon nanotubes (D-MWCNTs) were incorporated into polydopamine functionalized hybrid PTFE/Nomex fabric (D-fabric) composite to improve the tribological performance of the phenolic composite. XPS, TGA, SEM, and TEM characteristics illustrated that the hybrid PTFE/Nomex fabric, graphene oxide (GO), and carbon nanotube (MWCNTs) were successfully functionalized by polydopamine. More importantly, wear test results showed that D-rGO (or D-MWCNTs) reinforced D-fabric phenolic composite exhibited excellent tribological performance. The wear test results and corresponding wear mechanisms of the hybrid PTFE/Nomex fabric composite were discussed in terms of characterizations.
Wei-min Liu - One of the best experts on this subject based on the ideXlab platform.
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POSS grafted hybrid-fabric composites with a biomimic middle layer for simultaneously improved UV resistance and tribological properties
Composites Science and Technology, 2018Co-Authors: Junya Yuan, Xuehu Men, Zhao-zhu Zhang, Wenjing Wang, Mingming Yang, Wei-min LiuAbstract:Poor interfacial adhesion and inferior UV resistance severely inhibit the development of hybrid Meta-aramid/Polytetrafluoroethylene (Nomex/PTFE) fabric composites for distinguished solid self-lubrication materials, especially under high exterior load and long-term UV irradiation conditions. Herein, glycidyl polyhedral oligomeric silesquioxanes (POSS) nanoparticles are covalently grafted onto the hybrid Nomex/PTFE fabric with a polydopamine/polyethylenimine (PDA/PEI) intermediate layer. The microstructure and chemical characteristics of Nomex and PTFE fibers before and after modification are investigated and the results manifest an obvious increase in surface functional groups and roughness, as well as resin compatibility. Tensile and peeling testing results show that the obtained fabric composites, denoted as hybrid-fabric@PDA/PEI-POSS composites, exhibit 24.3% and 46.8% enhancements in tensile and interfacial bonding strength without discernable decrease in pristine hybrid-fabric strength. In addition, the PDA/PEI-POSS hierarchical coating imparts the hybrid-fabric with excellent UV-shielding properties. As a result, the tribological performance of hybrid-fabric@PDA/PEI-POSS composites presents an obvious improvement under high load and UV irradiation conditions.
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Surface modification of hybrid-fabric composites with amino silane and polydopamine for enhanced mechanical and tribological behaviors
Tribology International, 2017Co-Authors: Junya Yuan, Xuehu Men, Fang Guo, Zhao-zhu Zhang, Mingming Yang, Wei-min LiuAbstract:The poor interfacial adhesion between hybrid Nomex/PTFE fabric surfaces and polymer materials caused intrinsically by chemical inertness of Nomex and PTFE fibers severely inhibits the further application of hybrid Nomex/PTFE fabric composites. In this study, amino functionalized silane layer (KH550) was immobilized covalently onto hybrid Nomex/PTFE fabric surfaces using bio-inspired polydopamine (PDA) as a bridge to introduce substantial amino groups onto the fabric surfaces. The successful grafting of KH550 on the PDA-coated hybrid fabric surfaces was confirmed by FTIR, XPS and SEM. As a result, the tensile and bonding strength of the amino-functionalized fabric composite were obviously superior to those of the non-treated and polydopamine-coated only, which indicated that the introduction of amino functional layer brought about considerable improvement in interfacial compatibility of hybrid Nomex/PTFE fabric with the phenolic resin matrix. Besides, wear tests also showed the modified fabric composite exhibited the optimal tribological properties under varied test conditions. Most significantly, the strategy presented in this study is substrate-independent along with considerable flexibility to introduce various functional groups, suggesting promising applications for easily improving the interfacial compatibility of reinforcements with polymer matrix.
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Influence of lubricant filling on the dry sliding wear behaviors of hybrid PTFE/Nomex fabric composite
Journal of Materials Science, 2014Co-Authors: Guina Ren, Xuehu Men, Xiaotao Zhu, Zhao-zhu Zhang, Wei-min LiuAbstract:To improve the antiwear property and load carrying capacity of hybrid PTFE/Nomex fabric/phenolic composites, graphene and graphene oxide (GO) had been synthesized and were employed as fillers, together with graphite. Sliding wear tests show that the wear rates of filler-reinforced PTFE/Nomex fabric composites were reduced greatly when compared to unfilled fabric composite. Besides, it was found that the 2 wt% GO filled PTFE/Nomex fabric composites exhibited the optimal tribological properties. It was proposed that the self-lubrication of GO, the favorable interface stability of the composite, and the uniform transfer film on the counterpart pin contributed together to the reinforced tribological property of GO filled PTFE/Nomex fabric composite. We also investigated the influence of filler content, applied load, sliding speed, and tensile and bonding strength on the tribological properties of PTFE/Nomex fabric composites. © 2014 Springer Science+Business Media New York.
Kun Wang - One of the best experts on this subject based on the ideXlab platform.
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a biomimetic approach to improving tribological properties of hybrid ptfe Nomex fabric phenolic composites
European Polymer Journal, 2016Co-Authors: Mingming Yang, Junya Yuan, Kun Wang, Zhao-zhu ZhangAbstract:Abstract Interfacial strength between reinforcement and polymer matrix and dispersion of lubricant fillers in polymer composites are vital properties in determining the mechanical behaviors and tribological performance. In this work, a facile biomimetic method was employed to improve the interfacial strength between hybrid PTFE/Nomex fabric and phenolic resin as well as the dispersion of carbon carbonaceous in phenolic composite. Dopamine is the main component of mussel adhesive proteins which can easily attach on substrate surface by self-polymerization under weak basic buffer solution. Hence, polydopamine modified graphene oxide (D-rGO) and multi-walled carbon nanotubes (D-MWCNTs) were incorporated into polydopamine functionalized hybrid PTFE/Nomex fabric (D-fabric) composite to improve the tribological performance of the phenolic composite. XPS, TGA, SEM, and TEM characteristics illustrated that the hybrid PTFE/Nomex fabric, graphene oxide (GO), and carbon nanotube (MWCNTs) were successfully functionalized by polydopamine. More importantly, wear test results showed that D-rGO (or D-MWCNTs) reinforced D-fabric phenolic composite exhibited excellent tribological performance. The wear test results and corresponding wear mechanisms of the hybrid PTFE/Nomex fabric composite were discussed in terms of characterizations.
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A biomimetic approach to improving tribological properties of hybrid PTFE/Nomex fabric/phenolic composites
European Polymer Journal, 2016Co-Authors: Mingming Yang, Junya Yuan, Kun Wang, Zhao-zhu ZhangAbstract:Abstract Interfacial strength between reinforcement and polymer matrix and dispersion of lubricant fillers in polymer composites are vital properties in determining the mechanical behaviors and tribological performance. In this work, a facile biomimetic method was employed to improve the interfacial strength between hybrid PTFE/Nomex fabric and phenolic resin as well as the dispersion of carbon carbonaceous in phenolic composite. Dopamine is the main component of mussel adhesive proteins which can easily attach on substrate surface by self-polymerization under weak basic buffer solution. Hence, polydopamine modified graphene oxide (D-rGO) and multi-walled carbon nanotubes (D-MWCNTs) were incorporated into polydopamine functionalized hybrid PTFE/Nomex fabric (D-fabric) composite to improve the tribological performance of the phenolic composite. XPS, TGA, SEM, and TEM characteristics illustrated that the hybrid PTFE/Nomex fabric, graphene oxide (GO), and carbon nanotube (MWCNTs) were successfully functionalized by polydopamine. More importantly, wear test results showed that D-rGO (or D-MWCNTs) reinforced D-fabric phenolic composite exhibited excellent tribological performance. The wear test results and corresponding wear mechanisms of the hybrid PTFE/Nomex fabric composite were discussed in terms of characterizations.
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friction and wear of synfluo 180xf wax and nano al2o3 filled Nomex fabric composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Fenghua Su, Zhao-zhu Zhang, Kun WangAbstract:Abstract Nomex fabric composites filled with the particulates of Synfluo 180XF wax (SFW) and nano-Al 2 O 3 was prepared by dip-coating of Nomex fabric in a phenolic resin containing particulates to be incorporated and the successive curing. The friction and wear performance of the pure and filled Nomex fabric composites sliding against AISI-1045 steel in a pin-on-disk configuration were evaluated on a Xuanwu-III high temperature friction and wear tester. The microstructure of the composites, and the morphologies of the worn surfaces and the morphologies of counterpart steel pins were analyzed by means of scanning electron microscopy. And the elemental plane distribution of Al on the cross-section of the Nomex fabric composites filled with nano-Al 2 O 3 was analyzed with an energy dispersive X-ray analyzer (EDAX). The results showed that the addition of Synfluo 180XF wax in composites have the potential to increase wear resistance and friction reduction of Nomex fabric composites, and the addition of the nano-Al 2 O 3 with the optimum mass fraction in composites can improve the anti-wear ability of the composites. Besides the self-properties of the filler, the character of the microstructure of the Nomex fabric composites filled with different particles, coupled with the character of the transfer film, largely accounts for the improved anti-wear and friction-reducing abilities of the filled Nomex fabric composites as compared with the unfilled one.
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effects of solid lubricants on friction and wear properties of Nomex fabric composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Fenghua Su, Zhao-zhu Zhang, Kun WangAbstract:Abstract The Nomex fabric composites filled with the particulates of PTFE, MoS 2 and graphite, respectively, were prepared by dip-coating of the Nomex fabric in a phenolic resin containing the particulates to be incorporated and the successive curing. The friction and wear behaviors of the pure and filled Nomex fabric composites sliding against AISI-1045 steel in a pin-on-disk configuration were evaluated on a Xuanwu-III high temperature friction and wear tester. The structure of the composites, and the morphologies of the worn surfaces or of the counterpart steel pins of the composites were analyzed by means of scanning electron microscopy (SEM). It was found that the filler of PTFE significantly improved the wear resistance and decrease the friction coefficient of the Nomex fabric composites, but the MoS 2 and Graphite as fillers were harmful to the improvement of friction and wear behaviors of Nomex fabric composites. The bonding strength between the Nomex fabric, the filler and the adhesive resin of the Nomex fabric composites varied with the types of the particulate fillers, and with characteristics of the transferred layers formed on the counterpart steel pins, largely accounted for the different friction and wear behaviors of the pure and different solid lubricants-filled Nomex fabric composites.
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study on the friction and wear properties of the composites made of surface modified Nomex fabrics
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Fenghua Su, Zhao-zhu Zhang, Kun WangAbstract:Abstract The untreated, bromine-etched and bromoacetic acid-grafted Nomex fabrics were used to prepare Nomex fabric composites (NFC) by dip-coating in a phenolic resin. The friction coefficient, wear rate and the contact temperatures of the composites were evaluated with a Xuanwu-III high temperature friction and wear tester in a dry sliding condition. Their adhesion and tensile strength were evaluated on a DY35 universal materials testing machine, respectively. The untreated and grafted-Nomex fabrics were characterized with infrared spectroscopy. It was observed that the bromine-etching and bromoacetic acid-grafting could improve the anti-wear, friction-reducing and the load-carrying abilities of the Nomex fabric composites. Nomex fabric composites made of the bromoacetic acid-grafted Nomex fabric exhibited the best anti-wear properties and the largest adhesion strength. The holistic structure and the bonding strength between the Nomex fabric and binder of the composite were enhanced significantly when the Nomex fabric was modified with bromine-etching and bromoacetic acid-grafting. This was responsible for increased wear-resistance of the modified Nomex fabric composites made of them. The applied load and the environmental temperature affected the tribological properties of the composites.
Mingming Yang - One of the best experts on this subject based on the ideXlab platform.
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POSS grafted hybrid-fabric composites with a biomimic middle layer for simultaneously improved UV resistance and tribological properties
Composites Science and Technology, 2018Co-Authors: Junya Yuan, Xuehu Men, Zhao-zhu Zhang, Wenjing Wang, Mingming Yang, Wei-min LiuAbstract:Poor interfacial adhesion and inferior UV resistance severely inhibit the development of hybrid Meta-aramid/Polytetrafluoroethylene (Nomex/PTFE) fabric composites for distinguished solid self-lubrication materials, especially under high exterior load and long-term UV irradiation conditions. Herein, glycidyl polyhedral oligomeric silesquioxanes (POSS) nanoparticles are covalently grafted onto the hybrid Nomex/PTFE fabric with a polydopamine/polyethylenimine (PDA/PEI) intermediate layer. The microstructure and chemical characteristics of Nomex and PTFE fibers before and after modification are investigated and the results manifest an obvious increase in surface functional groups and roughness, as well as resin compatibility. Tensile and peeling testing results show that the obtained fabric composites, denoted as hybrid-fabric@PDA/PEI-POSS composites, exhibit 24.3% and 46.8% enhancements in tensile and interfacial bonding strength without discernable decrease in pristine hybrid-fabric strength. In addition, the PDA/PEI-POSS hierarchical coating imparts the hybrid-fabric with excellent UV-shielding properties. As a result, the tribological performance of hybrid-fabric@PDA/PEI-POSS composites presents an obvious improvement under high load and UV irradiation conditions.
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Surface modification of hybrid-fabric composites with amino silane and polydopamine for enhanced mechanical and tribological behaviors
Tribology International, 2017Co-Authors: Junya Yuan, Xuehu Men, Fang Guo, Zhao-zhu Zhang, Mingming Yang, Wei-min LiuAbstract:The poor interfacial adhesion between hybrid Nomex/PTFE fabric surfaces and polymer materials caused intrinsically by chemical inertness of Nomex and PTFE fibers severely inhibits the further application of hybrid Nomex/PTFE fabric composites. In this study, amino functionalized silane layer (KH550) was immobilized covalently onto hybrid Nomex/PTFE fabric surfaces using bio-inspired polydopamine (PDA) as a bridge to introduce substantial amino groups onto the fabric surfaces. The successful grafting of KH550 on the PDA-coated hybrid fabric surfaces was confirmed by FTIR, XPS and SEM. As a result, the tensile and bonding strength of the amino-functionalized fabric composite were obviously superior to those of the non-treated and polydopamine-coated only, which indicated that the introduction of amino functional layer brought about considerable improvement in interfacial compatibility of hybrid Nomex/PTFE fabric with the phenolic resin matrix. Besides, wear tests also showed the modified fabric composite exhibited the optimal tribological properties under varied test conditions. Most significantly, the strategy presented in this study is substrate-independent along with considerable flexibility to introduce various functional groups, suggesting promising applications for easily improving the interfacial compatibility of reinforcements with polymer matrix.
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effect of zrb2 particles incorporation on high temperature tribological properties of hybrid ptfe Nomex fabric phenolic composite
Tribology International, 2016Co-Authors: Mingming Yang, Junya Yuan, Zhao-zhu ZhangAbstract:Abstract The thermal stability of polymer matrix composite could effectively improve by incorporation of highly thermally conductive ceramic materials into polymers. In present work, hybrid PTFE/Nomex fabric/phenolic composite specimens were prepared with zirconium diboride (ZrB 2 ) particles for the improvement its high-temperature tribological performances. The thermal stability of hybrid PTFE/Nomex fabric/phenolic composite was investigated by TGA. The result showed that the thermal stability was improved because of addition of ZrB 2 particles. In addition, it was found that 9 wt% ZrB 2 reinforced hybrid PTFE/Nomex fabric/phenolic composite exhibited optimal tribological performances compared to unfilled fabric composite under all test conditions.
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Effect of ZrB2 particles incorporation on high-temperature tribological properties of hybrid PTFE/Nomex fabric/phenolic composite
Tribology International, 2016Co-Authors: Mingming Yang, Junya Yuan, Zhao-zhu ZhangAbstract:Abstract The thermal stability of polymer matrix composite could effectively improve by incorporation of highly thermally conductive ceramic materials into polymers. In present work, hybrid PTFE/Nomex fabric/phenolic composite specimens were prepared with zirconium diboride (ZrB 2 ) particles for the improvement its high-temperature tribological performances. The thermal stability of hybrid PTFE/Nomex fabric/phenolic composite was investigated by TGA. The result showed that the thermal stability was improved because of addition of ZrB 2 particles. In addition, it was found that 9 wt% ZrB 2 reinforced hybrid PTFE/Nomex fabric/phenolic composite exhibited optimal tribological performances compared to unfilled fabric composite under all test conditions.
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a biomimetic approach to improving tribological properties of hybrid ptfe Nomex fabric phenolic composites
European Polymer Journal, 2016Co-Authors: Mingming Yang, Junya Yuan, Kun Wang, Zhao-zhu ZhangAbstract:Abstract Interfacial strength between reinforcement and polymer matrix and dispersion of lubricant fillers in polymer composites are vital properties in determining the mechanical behaviors and tribological performance. In this work, a facile biomimetic method was employed to improve the interfacial strength between hybrid PTFE/Nomex fabric and phenolic resin as well as the dispersion of carbon carbonaceous in phenolic composite. Dopamine is the main component of mussel adhesive proteins which can easily attach on substrate surface by self-polymerization under weak basic buffer solution. Hence, polydopamine modified graphene oxide (D-rGO) and multi-walled carbon nanotubes (D-MWCNTs) were incorporated into polydopamine functionalized hybrid PTFE/Nomex fabric (D-fabric) composite to improve the tribological performance of the phenolic composite. XPS, TGA, SEM, and TEM characteristics illustrated that the hybrid PTFE/Nomex fabric, graphene oxide (GO), and carbon nanotube (MWCNTs) were successfully functionalized by polydopamine. More importantly, wear test results showed that D-rGO (or D-MWCNTs) reinforced D-fabric phenolic composite exhibited excellent tribological performance. The wear test results and corresponding wear mechanisms of the hybrid PTFE/Nomex fabric composite were discussed in terms of characterizations.
Fenghua Su - One of the best experts on this subject based on the ideXlab platform.
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tribological and mechanical properties of Nomex fabric composites filled with polyfluo 150 wax and nano sio2
Composites Science and Technology, 2007Co-Authors: Fenghua Su, Zhao-zhu ZhangAbstract:Abstract Nomex fabric composites filled with the particulates of polyfluo150 wax (PFW) and nanoparticles of SiO 2 , respectively, were prepared by dip-coating of Nomex fabric in a phenolic resin containing particulates to be incorporated and the successive curing. The friction and wear behaviors of the pure and filled-Nomex fabric composites sliding against AISI-1045 steel in a pin-on-disk configuration were evaluated on a Xuanwu-III high temperature friction and wear tester. The structure of the composites, and the morphologies of the worn surfaces and of the counterpart steel pins were analyzed by means of scanning electron microscopy. The adhesion and tensile strength of the unfilled, PFW or nano-SiO 2 filled Nomex fabric composites were evaluated with a DY35 universal material tester. The results showed that the addition of PFW and nano-SiO 2 significantly improved the wear resistance and decreased the friction coefficient, moreover the PFW as a filler is better than nano-SiO 2 . The improved tribological performance of filled-Nomex fabric composites when compared with the unfilled one, can be attributed to the self-properties of filler, such as the self-lubricative of PFW, the bonding strength between the Nomex fabric and the adhesive resin adopted with the different particles and the special characteristic of transfer film.
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tribological properties of the composites made of pure and plasma treated Nomex fabrics
Wear, 2006Co-Authors: Fenghua Su, Zhao-zhu Zhang, Haojie SongAbstract:Abstract The pure and air-plasma treated Nomex fabric was used to prepare Nomex fabric composites (NFC) by dip-coating in a phenolic resin and the relative mass content of Nomex fabric in the Nomex fabric composites is 65%. The friction coefficient, wear rate and the contact temperature of the Nomex fabric composites were evaluated with a Xuanwu-III high temperature friction and wear tester in a dry sliding condition. The change in the chemical compositions of the pure and air-plasma treated Nomex fabric at 19.8 W for 5 min were analyzed by means of X-ray photoelectron spectroscopy and FTIR. The morphologies of the worn surfaces for the Nomex fabric composites at different condition and of the pure and air-plasma treated-Nomex fiber were analyzed by means of scanning electron microscopy (SEM). It is found that the friction-reduction and anti-wear properties of the Nomex fabric composites are significantly improved by air-plasma bombardment. The roughness on the treated-fiber surface and the active groups of ketone ( C O) of the treated Nomex fabric increase during the bombardment process, which contribute to strengthen the bonding strength between the Nomex fabric and the adhesive and hence to improve the tribological properties of the composites. The applied load, sliding velocity and the environmental temperature affected the tribological properties of Nomex fabric composites. The friction coefficient, wear rate with contact temperature of the NFC coincided with each other.
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friction and wear of synfluo 180xf wax and nano al2o3 filled Nomex fabric composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Fenghua Su, Zhao-zhu Zhang, Kun WangAbstract:Abstract Nomex fabric composites filled with the particulates of Synfluo 180XF wax (SFW) and nano-Al 2 O 3 was prepared by dip-coating of Nomex fabric in a phenolic resin containing particulates to be incorporated and the successive curing. The friction and wear performance of the pure and filled Nomex fabric composites sliding against AISI-1045 steel in a pin-on-disk configuration were evaluated on a Xuanwu-III high temperature friction and wear tester. The microstructure of the composites, and the morphologies of the worn surfaces and the morphologies of counterpart steel pins were analyzed by means of scanning electron microscopy. And the elemental plane distribution of Al on the cross-section of the Nomex fabric composites filled with nano-Al 2 O 3 was analyzed with an energy dispersive X-ray analyzer (EDAX). The results showed that the addition of Synfluo 180XF wax in composites have the potential to increase wear resistance and friction reduction of Nomex fabric composites, and the addition of the nano-Al 2 O 3 with the optimum mass fraction in composites can improve the anti-wear ability of the composites. Besides the self-properties of the filler, the character of the microstructure of the Nomex fabric composites filled with different particles, coupled with the character of the transfer film, largely accounts for the improved anti-wear and friction-reducing abilities of the filled Nomex fabric composites as compared with the unfilled one.
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effects of solid lubricants on friction and wear properties of Nomex fabric composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Fenghua Su, Zhao-zhu Zhang, Kun WangAbstract:Abstract The Nomex fabric composites filled with the particulates of PTFE, MoS 2 and graphite, respectively, were prepared by dip-coating of the Nomex fabric in a phenolic resin containing the particulates to be incorporated and the successive curing. The friction and wear behaviors of the pure and filled Nomex fabric composites sliding against AISI-1045 steel in a pin-on-disk configuration were evaluated on a Xuanwu-III high temperature friction and wear tester. The structure of the composites, and the morphologies of the worn surfaces or of the counterpart steel pins of the composites were analyzed by means of scanning electron microscopy (SEM). It was found that the filler of PTFE significantly improved the wear resistance and decrease the friction coefficient of the Nomex fabric composites, but the MoS 2 and Graphite as fillers were harmful to the improvement of friction and wear behaviors of Nomex fabric composites. The bonding strength between the Nomex fabric, the filler and the adhesive resin of the Nomex fabric composites varied with the types of the particulate fillers, and with characteristics of the transferred layers formed on the counterpart steel pins, largely accounted for the different friction and wear behaviors of the pure and different solid lubricants-filled Nomex fabric composites.
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study on the friction and wear properties of the composites made of surface modified Nomex fabrics
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Fenghua Su, Zhao-zhu Zhang, Kun WangAbstract:Abstract The untreated, bromine-etched and bromoacetic acid-grafted Nomex fabrics were used to prepare Nomex fabric composites (NFC) by dip-coating in a phenolic resin. The friction coefficient, wear rate and the contact temperatures of the composites were evaluated with a Xuanwu-III high temperature friction and wear tester in a dry sliding condition. Their adhesion and tensile strength were evaluated on a DY35 universal materials testing machine, respectively. The untreated and grafted-Nomex fabrics were characterized with infrared spectroscopy. It was observed that the bromine-etching and bromoacetic acid-grafting could improve the anti-wear, friction-reducing and the load-carrying abilities of the Nomex fabric composites. Nomex fabric composites made of the bromoacetic acid-grafted Nomex fabric exhibited the best anti-wear properties and the largest adhesion strength. The holistic structure and the bonding strength between the Nomex fabric and binder of the composite were enhanced significantly when the Nomex fabric was modified with bromine-etching and bromoacetic acid-grafting. This was responsible for increased wear-resistance of the modified Nomex fabric composites made of them. The applied load and the environmental temperature affected the tribological properties of the composites.