The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Xinglong Gong - One of the best experts on this subject based on the ideXlab platform.
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The CNT/PSt-EA/Kevlar composite with excellent ballistic performance
Composites Part B-engineering, 2020Co-Authors: Haoming Pang, Shouhu Xuan, Chunyu Zhao, Xinglong GongAbstract:Abstract This work reports a new type of ballistic composite which is prepared by integrating the carbon nanotube-polystyrene ethyl acrylate (CNT/PSt-EA) based shear thickening fluid (C-STF) with Kevlar fabric. Because the rheological property of the PSt-EA based STF is significantly enhanced by the CNT, the C-STF/Kevlar offers better ballistic property than Kevlar fabric. The ballistic test indicated that the ballistic limit velocity ( v b l ) of Kevlar could be improved from 84.6 m/s to 96.5 m/s by impregnating the C-STF. Here, the optimum addition of CNT for C-STF/Kevlar is 1.0% and excessive CNT addition reduces the reinforcement effect. Besides, as the volume fraction of dispersed phase in STF increased from 53.5% to 58.5%, the v b l increased from 92.9 m/s to 99.5 m/s. The fabric layer number also plays a critical role in the ballistic property of C-STF/Kevlar. By combining the finite element analysis (FEA) results of ballistic impact with the quasi-static puncture and yarn pull-out results, the enhanced anti-impact mechanism is obtained. It is found that the friction coefficient between the yarns is strengthened and the bearing area of the fabric is increased by doping STFs, thereby the ballistic performance of Kevlar is improved. This work achieves the regulation of ballistic performance of Kevlar composites.
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impact resistance of shear thickening fluid Kevlar composite treated with shear stiffening gel
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Qianyun He, Yunpeng Wang, Shouhu Xuan, Pengfei Wang, Xinglong GongAbstract:Abstract In this work, shear-stiffening gel (STG) was introduced into shear thickening fluid (STF)-impregnated-Kevlar® woven fabric (Kevlar/STF) to improve the impact resistance. The STF filled within the yarns of Kevlar and the STG covered the Kevlar/STF to form Kevlar/STF/STG composite. The STG in the Kevlar/STF/STG not only protected STF but also improved the impact resistance of the fabric because of its excellent shear-stiffening characteristics. A series of experiments including the yarn pull-out test, the split Hopkinson pressure bar impact test, rod penetration test, and knife cutting test were carried out to verify the enhancement effect. The improvement mechanism of the impact resistance for the Kevlar/STF/STG was studied. Under the similar anti-impact performance, the Kevlar/STF/STG possessed lower weight than the Kevlar and its strong impact resistance originated from the synergetic effect among the STF, STG and Kevlar. Therefore, the Kevlar/STF/STG exhibited broad potential in the soft body armor.
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Impact resistance of shear thickening fluid/Kevlar composite treated with shear-stiffening gel
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Qianyun He, Yunpeng Wang, Shouhu Xuan, Pengfei Wang, Xinglong GongAbstract:Abstract In this work, shear-stiffening gel (STG) was introduced into shear thickening fluid (STF)-impregnated-Kevlar® woven fabric (Kevlar/STF) to improve the impact resistance. The STF filled within the yarns of Kevlar and the STG covered the Kevlar/STF to form Kevlar/STF/STG composite. The STG in the Kevlar/STF/STG not only protected STF but also improved the impact resistance of the fabric because of its excellent shear-stiffening characteristics. A series of experiments including the yarn pull-out test, the split Hopkinson pressure bar impact test, rod penetration test, and knife cutting test were carried out to verify the enhancement effect. The improvement mechanism of the impact resistance for the Kevlar/STF/STG was studied. Under the similar anti-impact performance, the Kevlar/STF/STG possessed lower weight than the Kevlar and its strong impact resistance originated from the synergetic effect among the STF, STG and Kevlar. Therefore, the Kevlar/STF/STG exhibited broad potential in the soft body armor.
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high strain rate dynamic mechanical properties of Kevlar fabrics impregnated with shear thickening fluid
Composites Part A-applied Science and Manufacturing, 2017Co-Authors: Qian Chen, Yunpeng Wang, Shouhu Xuan, Wanquan Jiang, Xinglong GongAbstract:Abstract To investigate the anti-impact mechanism, the mechanical property and energy absorption of the STF impregnated Kevlar (STF/Kevlar) fabric at high strain rate were conducted using a split Hopkinson pressure bar (SHPB) system. The volume fraction of STF, number of fabric specimens, and impact velocity highly affected the dynamic mechanical performance of the STF/Kevlar composite. The energy transfer rate decreased from 0.85 to 0.01 once the number of fabric specimens increased from 2 layers to 8 layers. The strain rate stiffening mechanism of the STF/Kevlar was analyzed. The Kevlar fabrics underwent four sections during the impact process. The STF was mainly worked in the slip and deformation section by enhancing the friction between fabric yarns and preventing the fabric yarns from slipping. Overall, this work demonstrated that the multilayer Kevlar fabrics impregnated with high volume fraction of STF were the optimal choice for soft body armor.
Shouhu Xuan - One of the best experts on this subject based on the ideXlab platform.
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The CNT/PSt-EA/Kevlar composite with excellent ballistic performance
Composites Part B-engineering, 2020Co-Authors: Haoming Pang, Shouhu Xuan, Chunyu Zhao, Xinglong GongAbstract:Abstract This work reports a new type of ballistic composite which is prepared by integrating the carbon nanotube-polystyrene ethyl acrylate (CNT/PSt-EA) based shear thickening fluid (C-STF) with Kevlar fabric. Because the rheological property of the PSt-EA based STF is significantly enhanced by the CNT, the C-STF/Kevlar offers better ballistic property than Kevlar fabric. The ballistic test indicated that the ballistic limit velocity ( v b l ) of Kevlar could be improved from 84.6 m/s to 96.5 m/s by impregnating the C-STF. Here, the optimum addition of CNT for C-STF/Kevlar is 1.0% and excessive CNT addition reduces the reinforcement effect. Besides, as the volume fraction of dispersed phase in STF increased from 53.5% to 58.5%, the v b l increased from 92.9 m/s to 99.5 m/s. The fabric layer number also plays a critical role in the ballistic property of C-STF/Kevlar. By combining the finite element analysis (FEA) results of ballistic impact with the quasi-static puncture and yarn pull-out results, the enhanced anti-impact mechanism is obtained. It is found that the friction coefficient between the yarns is strengthened and the bearing area of the fabric is increased by doping STFs, thereby the ballistic performance of Kevlar is improved. This work achieves the regulation of ballistic performance of Kevlar composites.
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impact resistance of shear thickening fluid Kevlar composite treated with shear stiffening gel
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Qianyun He, Yunpeng Wang, Shouhu Xuan, Pengfei Wang, Xinglong GongAbstract:Abstract In this work, shear-stiffening gel (STG) was introduced into shear thickening fluid (STF)-impregnated-Kevlar® woven fabric (Kevlar/STF) to improve the impact resistance. The STF filled within the yarns of Kevlar and the STG covered the Kevlar/STF to form Kevlar/STF/STG composite. The STG in the Kevlar/STF/STG not only protected STF but also improved the impact resistance of the fabric because of its excellent shear-stiffening characteristics. A series of experiments including the yarn pull-out test, the split Hopkinson pressure bar impact test, rod penetration test, and knife cutting test were carried out to verify the enhancement effect. The improvement mechanism of the impact resistance for the Kevlar/STF/STG was studied. Under the similar anti-impact performance, the Kevlar/STF/STG possessed lower weight than the Kevlar and its strong impact resistance originated from the synergetic effect among the STF, STG and Kevlar. Therefore, the Kevlar/STF/STG exhibited broad potential in the soft body armor.
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Impact resistance of shear thickening fluid/Kevlar composite treated with shear-stiffening gel
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Qianyun He, Yunpeng Wang, Shouhu Xuan, Pengfei Wang, Xinglong GongAbstract:Abstract In this work, shear-stiffening gel (STG) was introduced into shear thickening fluid (STF)-impregnated-Kevlar® woven fabric (Kevlar/STF) to improve the impact resistance. The STF filled within the yarns of Kevlar and the STG covered the Kevlar/STF to form Kevlar/STF/STG composite. The STG in the Kevlar/STF/STG not only protected STF but also improved the impact resistance of the fabric because of its excellent shear-stiffening characteristics. A series of experiments including the yarn pull-out test, the split Hopkinson pressure bar impact test, rod penetration test, and knife cutting test were carried out to verify the enhancement effect. The improvement mechanism of the impact resistance for the Kevlar/STF/STG was studied. Under the similar anti-impact performance, the Kevlar/STF/STG possessed lower weight than the Kevlar and its strong impact resistance originated from the synergetic effect among the STF, STG and Kevlar. Therefore, the Kevlar/STF/STG exhibited broad potential in the soft body armor.
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high strain rate dynamic mechanical properties of Kevlar fabrics impregnated with shear thickening fluid
Composites Part A-applied Science and Manufacturing, 2017Co-Authors: Qian Chen, Yunpeng Wang, Shouhu Xuan, Wanquan Jiang, Xinglong GongAbstract:Abstract To investigate the anti-impact mechanism, the mechanical property and energy absorption of the STF impregnated Kevlar (STF/Kevlar) fabric at high strain rate were conducted using a split Hopkinson pressure bar (SHPB) system. The volume fraction of STF, number of fabric specimens, and impact velocity highly affected the dynamic mechanical performance of the STF/Kevlar composite. The energy transfer rate decreased from 0.85 to 0.01 once the number of fabric specimens increased from 2 layers to 8 layers. The strain rate stiffening mechanism of the STF/Kevlar was analyzed. The Kevlar fabrics underwent four sections during the impact process. The STF was mainly worked in the slip and deformation section by enhancing the friction between fabric yarns and preventing the fabric yarns from slipping. Overall, this work demonstrated that the multilayer Kevlar fabrics impregnated with high volume fraction of STF were the optimal choice for soft body armor.
Yunpeng Wang - One of the best experts on this subject based on the ideXlab platform.
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impact resistance of shear thickening fluid Kevlar composite treated with shear stiffening gel
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Qianyun He, Yunpeng Wang, Shouhu Xuan, Pengfei Wang, Xinglong GongAbstract:Abstract In this work, shear-stiffening gel (STG) was introduced into shear thickening fluid (STF)-impregnated-Kevlar® woven fabric (Kevlar/STF) to improve the impact resistance. The STF filled within the yarns of Kevlar and the STG covered the Kevlar/STF to form Kevlar/STF/STG composite. The STG in the Kevlar/STF/STG not only protected STF but also improved the impact resistance of the fabric because of its excellent shear-stiffening characteristics. A series of experiments including the yarn pull-out test, the split Hopkinson pressure bar impact test, rod penetration test, and knife cutting test were carried out to verify the enhancement effect. The improvement mechanism of the impact resistance for the Kevlar/STF/STG was studied. Under the similar anti-impact performance, the Kevlar/STF/STG possessed lower weight than the Kevlar and its strong impact resistance originated from the synergetic effect among the STF, STG and Kevlar. Therefore, the Kevlar/STF/STG exhibited broad potential in the soft body armor.
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Impact resistance of shear thickening fluid/Kevlar composite treated with shear-stiffening gel
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Qianyun He, Yunpeng Wang, Shouhu Xuan, Pengfei Wang, Xinglong GongAbstract:Abstract In this work, shear-stiffening gel (STG) was introduced into shear thickening fluid (STF)-impregnated-Kevlar® woven fabric (Kevlar/STF) to improve the impact resistance. The STF filled within the yarns of Kevlar and the STG covered the Kevlar/STF to form Kevlar/STF/STG composite. The STG in the Kevlar/STF/STG not only protected STF but also improved the impact resistance of the fabric because of its excellent shear-stiffening characteristics. A series of experiments including the yarn pull-out test, the split Hopkinson pressure bar impact test, rod penetration test, and knife cutting test were carried out to verify the enhancement effect. The improvement mechanism of the impact resistance for the Kevlar/STF/STG was studied. Under the similar anti-impact performance, the Kevlar/STF/STG possessed lower weight than the Kevlar and its strong impact resistance originated from the synergetic effect among the STF, STG and Kevlar. Therefore, the Kevlar/STF/STG exhibited broad potential in the soft body armor.
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high strain rate dynamic mechanical properties of Kevlar fabrics impregnated with shear thickening fluid
Composites Part A-applied Science and Manufacturing, 2017Co-Authors: Qian Chen, Yunpeng Wang, Shouhu Xuan, Wanquan Jiang, Xinglong GongAbstract:Abstract To investigate the anti-impact mechanism, the mechanical property and energy absorption of the STF impregnated Kevlar (STF/Kevlar) fabric at high strain rate were conducted using a split Hopkinson pressure bar (SHPB) system. The volume fraction of STF, number of fabric specimens, and impact velocity highly affected the dynamic mechanical performance of the STF/Kevlar composite. The energy transfer rate decreased from 0.85 to 0.01 once the number of fabric specimens increased from 2 layers to 8 layers. The strain rate stiffening mechanism of the STF/Kevlar was analyzed. The Kevlar fabrics underwent four sections during the impact process. The STF was mainly worked in the slip and deformation section by enhancing the friction between fabric yarns and preventing the fabric yarns from slipping. Overall, this work demonstrated that the multilayer Kevlar fabrics impregnated with high volume fraction of STF were the optimal choice for soft body armor.
Huijuan Zhang - One of the best experts on this subject based on the ideXlab platform.
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Tribological behavior of Kevlar fabric composites filled with nanoparticles
Journal of Applied Polymer Science, 2009Co-Authors: Zhaozhu Zhang, Huijuan ZhangAbstract:The friction and wear characteristics of ZnO- or montmorillonite-nanoparticle-filled Kevlar fabric composites with different filler proportions when sliding against stainless steel pins under dry friction conditions were studied, with unfilled Kevlar fabric composites used as references. The worn surface and transfer film of Kevlar fabric composites were then examined with a scanning electron microscope. It was found that ZnO and montmorillonite as fillers could improve the tribological behavior of the Kevlar fabric composites with various applied loads, and the best antiwear property was obtained with the composites containing 5 wt % ZnO or montmorillonite. This indicated that these nanoparticles could prevent the destruction of Kevlar fabric composites during the friction process. The transfer film established by these nanoparticles during the sliding wear of the composites against their metallic counterpart made contributions to reducing the friction coefficient and wear rate of the Kevlar fabric composites measured in the test. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
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effect of plasma treatment of Kevlar fabric on the tribological behavior of Kevlar fabric phenolic composites
Tribology International, 2009Co-Authors: Zhaozhu Zhang, Fenghua Su, Huijuan ZhangAbstract:Abstract Pure and plasma-treated Kevlar fabrics were used to prepare Kevlar fabric/phenolic composites by consecutive dipping of the fabric in phenolic adhesive resin. The friction and wear performance of the resulting composites has been evaluated in a pin-on-disk wear tester at various dry-sliding conditions. The surface changes occurring on Kevlar fibers treated with air–plasma were analyzed by using X-ray photoelectron spectroscope (XPS), Fourier transform infrared spectroscope (FT-IR) and scanning electron microscope (SEM). Moreover, the impact of air–plasma treatment time and power on the friction and wear behavior of Kevlar fabric/phenolic composites composed of the air–plasma-treated Kevlar fabrics was systematically studied. It was found that plasma treatment can significantly improve the tribological performance of the prepared Kevlar fabric/phenolic composites; the best performance was after a plasma treatment at 50 W for 15 min. The plasma treatment generates oxygenic and nitrogenous groups on the surface of the fabric, coupled with an increase of the surface roughness, strengthening the bond between the Kevlar fabric and phenolic adhesive resin and hence improving the tribological properties of the Kevlar fabric/phenolic composites.
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Effect of plasma treatment of Kevlar fabric on the tribological behavior of Kevlar fabric/phenolic composites
Tribology International, 2009Co-Authors: Zhaozhu Zhang, Fenghua Su, Huijuan ZhangAbstract:Abstract Pure and plasma-treated Kevlar fabrics were used to prepare Kevlar fabric/phenolic composites by consecutive dipping of the fabric in phenolic adhesive resin. The friction and wear performance of the resulting composites has been evaluated in a pin-on-disk wear tester at various dry-sliding conditions. The surface changes occurring on Kevlar fibers treated with air–plasma were analyzed by using X-ray photoelectron spectroscope (XPS), Fourier transform infrared spectroscope (FT-IR) and scanning electron microscope (SEM). Moreover, the impact of air–plasma treatment time and power on the friction and wear behavior of Kevlar fabric/phenolic composites composed of the air–plasma-treated Kevlar fabrics was systematically studied. It was found that plasma treatment can significantly improve the tribological performance of the prepared Kevlar fabric/phenolic composites; the best performance was after a plasma treatment at 50 W for 15 min. The plasma treatment generates oxygenic and nitrogenous groups on the surface of the fabric, coupled with an increase of the surface roughness, strengthening the bond between the Kevlar fabric and phenolic adhesive resin and hence improving the tribological properties of the Kevlar fabric/phenolic composites.
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Influence of solid lubricant reinforcement on wear behavior of Kevlar fabric composites
Journal of Applied Polymer Science, 2008Co-Authors: Zhaozhu Zhang, Fenghua Su, Huijuan ZhangAbstract:The friction and wear behavior of Kevlar fabric composites reinforced by PTFE or graphite powders was investigated using a Xuanwu-III friction and wear tester at dry sliding condition, with the unfilled Kevlar fabric composite as a reference. The worn surfaces were analyzed by means of scanning electron microscope, and X-ray photoelectron spectroscopy. It was found that PTFE or graphite as fillers could significantly improve the tribological behavior of the Kevlar fabric composites, and the Kevlar fabric composites filled with 20%, PTFE exhibited the best antiwear and antifriction ability among all evaluated cases. The transfer films established with two lubricants in sliding wear of composites against metallic counterparts made contributions to reducing friction coefficient and wear rate of Kevlar fabric composites. In particular, FeF2 generated in the sliding of Kevlar fabric composites filled with PTFE against counterpart pin improved the bonding strength between the transfer film and counterpart surface, which accounted for the lowest friction coefficient and wear rate of the Kevlar fabric composites filled with PTFE measured in the testing. (C) 2008 Wiley Periodicals, Inc.
Zhaozhu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Tribological behavior of Kevlar fabric composites filled with nanoparticles
Journal of Applied Polymer Science, 2009Co-Authors: Zhaozhu Zhang, Huijuan ZhangAbstract:The friction and wear characteristics of ZnO- or montmorillonite-nanoparticle-filled Kevlar fabric composites with different filler proportions when sliding against stainless steel pins under dry friction conditions were studied, with unfilled Kevlar fabric composites used as references. The worn surface and transfer film of Kevlar fabric composites were then examined with a scanning electron microscope. It was found that ZnO and montmorillonite as fillers could improve the tribological behavior of the Kevlar fabric composites with various applied loads, and the best antiwear property was obtained with the composites containing 5 wt % ZnO or montmorillonite. This indicated that these nanoparticles could prevent the destruction of Kevlar fabric composites during the friction process. The transfer film established by these nanoparticles during the sliding wear of the composites against their metallic counterpart made contributions to reducing the friction coefficient and wear rate of the Kevlar fabric composites measured in the test. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
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effect of plasma treatment of Kevlar fabric on the tribological behavior of Kevlar fabric phenolic composites
Tribology International, 2009Co-Authors: Zhaozhu Zhang, Fenghua Su, Huijuan ZhangAbstract:Abstract Pure and plasma-treated Kevlar fabrics were used to prepare Kevlar fabric/phenolic composites by consecutive dipping of the fabric in phenolic adhesive resin. The friction and wear performance of the resulting composites has been evaluated in a pin-on-disk wear tester at various dry-sliding conditions. The surface changes occurring on Kevlar fibers treated with air–plasma were analyzed by using X-ray photoelectron spectroscope (XPS), Fourier transform infrared spectroscope (FT-IR) and scanning electron microscope (SEM). Moreover, the impact of air–plasma treatment time and power on the friction and wear behavior of Kevlar fabric/phenolic composites composed of the air–plasma-treated Kevlar fabrics was systematically studied. It was found that plasma treatment can significantly improve the tribological performance of the prepared Kevlar fabric/phenolic composites; the best performance was after a plasma treatment at 50 W for 15 min. The plasma treatment generates oxygenic and nitrogenous groups on the surface of the fabric, coupled with an increase of the surface roughness, strengthening the bond between the Kevlar fabric and phenolic adhesive resin and hence improving the tribological properties of the Kevlar fabric/phenolic composites.
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Effect of plasma treatment of Kevlar fabric on the tribological behavior of Kevlar fabric/phenolic composites
Tribology International, 2009Co-Authors: Zhaozhu Zhang, Fenghua Su, Huijuan ZhangAbstract:Abstract Pure and plasma-treated Kevlar fabrics were used to prepare Kevlar fabric/phenolic composites by consecutive dipping of the fabric in phenolic adhesive resin. The friction and wear performance of the resulting composites has been evaluated in a pin-on-disk wear tester at various dry-sliding conditions. The surface changes occurring on Kevlar fibers treated with air–plasma were analyzed by using X-ray photoelectron spectroscope (XPS), Fourier transform infrared spectroscope (FT-IR) and scanning electron microscope (SEM). Moreover, the impact of air–plasma treatment time and power on the friction and wear behavior of Kevlar fabric/phenolic composites composed of the air–plasma-treated Kevlar fabrics was systematically studied. It was found that plasma treatment can significantly improve the tribological performance of the prepared Kevlar fabric/phenolic composites; the best performance was after a plasma treatment at 50 W for 15 min. The plasma treatment generates oxygenic and nitrogenous groups on the surface of the fabric, coupled with an increase of the surface roughness, strengthening the bond between the Kevlar fabric and phenolic adhesive resin and hence improving the tribological properties of the Kevlar fabric/phenolic composites.
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Influence of solid lubricant reinforcement on wear behavior of Kevlar fabric composites
Journal of Applied Polymer Science, 2008Co-Authors: Zhaozhu Zhang, Fenghua Su, Huijuan ZhangAbstract:The friction and wear behavior of Kevlar fabric composites reinforced by PTFE or graphite powders was investigated using a Xuanwu-III friction and wear tester at dry sliding condition, with the unfilled Kevlar fabric composite as a reference. The worn surfaces were analyzed by means of scanning electron microscope, and X-ray photoelectron spectroscopy. It was found that PTFE or graphite as fillers could significantly improve the tribological behavior of the Kevlar fabric composites, and the Kevlar fabric composites filled with 20%, PTFE exhibited the best antiwear and antifriction ability among all evaluated cases. The transfer films established with two lubricants in sliding wear of composites against metallic counterparts made contributions to reducing friction coefficient and wear rate of Kevlar fabric composites. In particular, FeF2 generated in the sliding of Kevlar fabric composites filled with PTFE against counterpart pin improved the bonding strength between the transfer film and counterpart surface, which accounted for the lowest friction coefficient and wear rate of the Kevlar fabric composites filled with PTFE measured in the testing. (C) 2008 Wiley Periodicals, Inc.
