The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Saikat Talapatra - One of the best experts on this subject based on the ideXlab platform.
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Carbon Nanotube−MoS2 Composites as Solid Lubricants
ACS Applied Materials & Interfaces, 2009Co-Authors: Xianfeng Zhang, S. M. Aouadi, Brandon Luster, Amelia Church, Punit Kohli, Andrey A. Voevodin, Christopher Muratore, Saikat TalapatraAbstract:Solid Lubricants (SLs) characterized by low coefficients of friction (μ) and wear rates (w) drastically improve the life span of instruments that undergo extreme frictional wear. However, the performance of SLs such as sputtered or nanoparticulate molybdenum disulfide (MoS2), tungsten disulfide (WS2), or graphite deteriorates heavily under extreme operational conditions such as elevated temperatures and high humidity. Here, we present our preliminary results, which demonstrate that composites of carbon nanotubes (CNTs) and MoS2 produced by electrodeposition of MoS2 on vertically aligned CNT films have low μ (∼0.03) and w (∼10−13 mm3/N·mm) even at 300 °C, which are about 2 orders of magnitude better than those of nanoparticulate MoS2-based coatings. The high load-bearing capacity of CNTs provides a strong enduring support to MoS2 nanoclusters and is responsible for their ultralow w. The incorporation of these composites in liquid Lubricants reduces the friction coefficient of the liquid Lubricants by ∼15%....
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carbon nanotube mos2 composites as Solid Lubricants
ACS Applied Materials & Interfaces, 2009Co-Authors: Xianfeng Zhang, S. M. Aouadi, Brandon Luster, Amelia Church, Punit Kohli, Andrey A. Voevodin, Christopher Muratore, Saikat TalapatraAbstract:Solid Lubricants (SLs) characterized by low coefficients of friction (μ) and wear rates (w) drastically improve the life span of instruments that undergo extreme frictional wear. However, the performance of SLs such as sputtered or nanoparticulate molybdenum disulfide (MoS2), tungsten disulfide (WS2), or graphite deteriorates heavily under extreme operational conditions such as elevated temperatures and high humidity. Here, we present our preliminary results, which demonstrate that composites of carbon nanotubes (CNTs) and MoS2 produced by electrodeposition of MoS2 on vertically aligned CNT films have low μ (∼0.03) and w (∼10−13 mm3/N·mm) even at 300 °C, which are about 2 orders of magnitude better than those of nanoparticulate MoS2-based coatings. The high load-bearing capacity of CNTs provides a strong enduring support to MoS2 nanoclusters and is responsible for their ultralow w. The incorporation of these composites in liquid Lubricants reduces the friction coefficient of the liquid Lubricants by ∼15%....
Jianxin Deng - One of the best experts on this subject based on the ideXlab platform.
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modifying tribological performances of aisi 316 stainless steel surfaces by laser surface texturing and various Solid Lubricants
Optics and Laser Technology, 2019Co-Authors: Rong Meng, Jianxin Deng, Ran Duan, Yayun Liu, Guiliang ZhangAbstract:Abstract Severe wear is the primary failure mechanism of AISI 316 stainless steel in tribological applications. The use of surface textures is a well-known method to improve mechanical property of contact surfaces. In this paper, micro-textures were produced on the steel surface by laser ablation process. Different types of Solid Lubricants were filled into the micro-scale textures, including CaF2, h-BN, WS2, and graphite. Dry sliding tests were conducted to examine the tribological performance of the prepared samples. Results showed that severe plastic deformation occurred on both patterned and flat samples. The patterned sample burnished with CaF2 Solid Lubricants did not show any apparent decrease in average friction coefficient. Almost all h-BN Solid Lubricants were squeezed out of the contact area, causing a high friction coefficient. Both patterned samples burnished with WS2 or graphite Solid Lubricants showed a relatively low friction coefficient. The lubricating tribofilm existed on the worn area can protect the prepared samples from further wear damage. This study provides a basis for the proper selection of Solid Lubricants in industrial applications.
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Friction and Wear Behavior of Textured Al2O3/TiC Ceramic Surface Filled with MoS2 Solid Lubricants
Applied Mechanics and Materials, 2012Co-Authors: You Qiang Xing, Ze Wu, Jianxin Deng, Yunsong LianAbstract:Three different textures were produced by Laser Surface Texturing (LST) on Al2O3/TiC ceramic surfaces. MoS2 Solid Lubricants were filled into the textures. The friction and wear properties of textured and untextured surfaces were investigated by carrying out sliding tests against AISI440C stainless steel balls. Results showed that the textured surfaces filled with MoS2 Solid Lubricants exhibited lower friction coefficient and excellent anti-wear properties compared with untextured surfaces. At the texture spacing of 100μm, 150μm and 200μm, wavy textured surface had the lowest friction coefficient, while it was the dimpled surface at the texture spacing of 250μm. MoS2 film in the spaces between the textures was formed by mechanical engagement of particles in the rough surfaces and Solid Lubricants in textures. The friction coefficient and wear rates were reduced by supply of Solid Lubricants from the textures to the surfaces, bulges around the textures and TiO2 formed after laser texturing.
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Tribological behavior of textured cemented carbide filled with Solid Lubricants in dry sliding with titanium alloys
Wear, 2012Co-Authors: Ze Wu, Yunsong Lian, Hui Zhang, Jianxin Deng, Jun ZhaoAbstract:Abstract Laser surface textures were made on the surfaces of WC/Co cemented carbide disks. Dry sliding friction and wear tests against titanium alloy balls were carried out with four kinds of samples for comparison. Results showed that the smooth surface burnished with Solid Lubricants cannot effectively improve the frictional performance of the cemented carbide, the textured surface without Solid Lubricants has a worse tribological behavior compared with the smooth surface, and only the surface texturing combined with Solid Lubricants shows the benefit in improving the tribological properties. The average friction coefficient and temperature of the textured surface filled with Solid Lubricants are both reduced compared with those of the smooth surface. Operation with textured surface filled with Solid Lubricants can also reduce the width of wear scars on the cemented carbide disks and wear loss of titanium alloy balls.
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friction and wear behaviors of the carbide tools embedded with Solid Lubricants in sliding wear tests and in dry cutting processes
Wear, 2011Co-Authors: Jianxin Deng, Wenlong Song, Hui ZhangAbstract:Abstract Micro-holes were made on the surface of WC/TiC/Co carbide, MoS2 Solid Lubricants were filled into these micro-holes. Reciprocating sliding tests and dry cutting tests were carried out with this carbide tools. Results showed that the friction coefficient of conventional carbide is much higher than that of the carbide embedded with Solid Lubricants in sliding tests. The cutting forces, temperature, and friction coefficient at the tool–chip interface of the tool embedded with Solid Lubricants were reduced compared with that of the conventional tool. Two mechanisms responsible were found, the first one is explained as the formation of self-lubricating film at the tool–chip interface, which was released from the micro-hole and smeared on the rake, and served as lubricating additive; the other one was explained by the reduced contact length at the tool–chip interface, which contributes to the decrease of direct contact area between the chip and rake face.
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microstructure and mechanical properties of hot pressed al2o3 tic ceramic composites with the additions of Solid Lubricants
Ceramics International, 2005Co-Authors: Jianxin DengAbstract:Al2O3/TiC ceramic composites with the additions of different Solid Lubricants such as MoS2, BN, and CaF2 were produced by hot pressing. Effect of the Solid Lubricants on the microstructure and mechanical properties of this ceramic composite has been studied. No trace of MoS2 was found in the sintered Al2O3/TiC/MoS2 composite owing to its low melting point and escaping during the hot-pressing process. The flexural strength, fracture toughness, and hardness of Al2O3/TiC/MoS2 composite continuously decreased with the increasing of MoS2 content. AlN phase resulted from the reaction of Al2O3 with BN was formed in Al2O3/TiC/BN composite after sintering. Significant micro-cracks resulted from the residual stress owing to the difference in the thermal expansion coefficient were found on the polished surface, and caused large mechanical properties degradation for Al2O3/TiC/BN composite. While Al2O3/TiC/CaF2 ceramic composite showed relative higher flexural strength, fracture toughness, and hardness compared with that of Al2O3/TiC/MoS2 and Al2O3/TiC/BN composites owing its absence porosity and finer microstructure.
Ashlie Martini - One of the best experts on this subject based on the ideXlab platform.
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synergetic effects of surface texturing and Solid Lubricants to tailor friction and wear a review
Tribology International, 2021Co-Authors: Andreas Rosenkranz, H.l. Costa, Mehmet Z. Baykara, Ashlie MartiniAbstract:Abstract Surface texturing and Solid Lubricants have demonstrated the ability to substantially reduce friction and wear under dry conditions. In recent decades, these two technologies have been combined to leverage the advantages of both for superior tribological performance. This review article first summarizes the state-of-the-art regarding surface texturing and Solid Lubricants, including soft metals, polytetrafluorethylene, diamond-like carbon and 2D layered materials. Then, the synergy between surface textures and Solid Lubricants is discussed, with particular emphasis on the underlying mechanisms. Finally, gaps in the existing understanding of these synergies are identified and opportunities for future research are suggested.
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Synergetic effects of surface texturing and Solid Lubricants to tailor friction and wear – A review
Tribology International, 2021Co-Authors: Andreas Rosenkranz, H.l. Costa, Mehmet Z. Baykara, Ashlie MartiniAbstract:Abstract Surface texturing and Solid Lubricants have demonstrated the ability to substantially reduce friction and wear under dry conditions. In recent decades, these two technologies have been combined to leverage the advantages of both for superior tribological performance. This review article first summarizes the state-of-the-art regarding surface texturing and Solid Lubricants, including soft metals, polytetrafluorethylene, diamond-like carbon and 2D layered materials. Then, the synergy between surface textures and Solid Lubricants is discussed, with particular emphasis on the underlying mechanisms. Finally, gaps in the existing understanding of these synergies are identified and opportunities for future research are suggested.
Andreas Rosenkranz - One of the best experts on this subject based on the ideXlab platform.
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synergetic effects of surface texturing and Solid Lubricants to tailor friction and wear a review
Tribology International, 2021Co-Authors: Andreas Rosenkranz, H.l. Costa, Mehmet Z. Baykara, Ashlie MartiniAbstract:Abstract Surface texturing and Solid Lubricants have demonstrated the ability to substantially reduce friction and wear under dry conditions. In recent decades, these two technologies have been combined to leverage the advantages of both for superior tribological performance. This review article first summarizes the state-of-the-art regarding surface texturing and Solid Lubricants, including soft metals, polytetrafluorethylene, diamond-like carbon and 2D layered materials. Then, the synergy between surface textures and Solid Lubricants is discussed, with particular emphasis on the underlying mechanisms. Finally, gaps in the existing understanding of these synergies are identified and opportunities for future research are suggested.
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Synergetic effects of surface texturing and Solid Lubricants to tailor friction and wear – A review
Tribology International, 2021Co-Authors: Andreas Rosenkranz, H.l. Costa, Mehmet Z. Baykara, Ashlie MartiniAbstract:Abstract Surface texturing and Solid Lubricants have demonstrated the ability to substantially reduce friction and wear under dry conditions. In recent decades, these two technologies have been combined to leverage the advantages of both for superior tribological performance. This review article first summarizes the state-of-the-art regarding surface texturing and Solid Lubricants, including soft metals, polytetrafluorethylene, diamond-like carbon and 2D layered materials. Then, the synergy between surface textures and Solid Lubricants is discussed, with particular emphasis on the underlying mechanisms. Finally, gaps in the existing understanding of these synergies are identified and opportunities for future research are suggested.
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Carbon Nanomaterials—Promising Solid Lubricants to Tailor Friction and Wear
Lubricants, 2019Co-Authors: Sebastian Suarez, Andreas RosenkranzAbstract:It is our pleasure to launch this Special Issue related to the application of carbon nanomaterials as Solid Lubricants to tailor friction and wear [...]
Wen Juan Li - One of the best experts on this subject based on the ideXlab platform.
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effect of Solid Lubricants on tribological behavior of glass fiber reinforced polyamide 6
Polymer Composites, 2013Co-Authors: Du-xin Li, Xin Deng, Wen Juan LiAbstract:The tribological properties of glass fiber reinforced polyamide 6 (GF/PA6, 15/85 by weight) and its composites filled with Solid Lubricants were investigated. The main purposes of this article were to study the hybrid effect of Solid Lubricants with glass fiber as well as the synergism of combined Solid Lubricants, the wear mechanisms were studied by SEM. The results showed that graphite impaired the tribological properties of GF/PA6, but the tribology behavior of graphite filled GF/PA6 composite could be significantly improved by polytetrafluroethylene (PTFE) or/and ultrahigh molecular weight polyethylene (UHMWPE), and the GF/PA6 composite filled with 5 wt % graphite, 5 wt % PTFE together with 5 wt % UHMWPE exhibited the lowest friction coefficient and wear rate, which was almost a reduction in friction coefficient by 37% and in wear rate by 34% contrast to GF/PA6. The effect of load was also studied, and the results showed that the friction coefficient was virtually not affected by load, while the wear rate all increased with increasing load. POLYM. COMPOS., 34:1783–1793, 2013. © 2013 Society of Plastics Engineers
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Tribological properties of Solid Lubricants filled glass fiber reinforced polyamide 6 composites
Materials & Design, 2013Co-Authors: Du-xin Li, Xin Deng, Wen Juan LiAbstract:Abstract The main purpose of this paper is to further optimize the tribological properties of the glass fiber reinforced PA6 (GF/PA6,15/85 by weight) for high performance friction materials using single or combinative Solid Lubricants such as Polytetrafluroethylene (PTFE), ultra-high molecular weight polyethylene (UHMWPE) and the combination of both of them. Various polymer blends, where GF/PA6 acts as the polymer matrix and Solid Lubricants as the dispersed phase were prepared by injection molding. The tribological properties of these materials and the synergism as a result of the incorporation of both PTFE and UHMWPE were investigated. The results showed that, at a load of 40 N and a velocity of 200 rpm, PTFE was effective in improving the tribological capabilities of matrix material. On the contrary, UHMWPE was not conductive to maintain the structure integrity of GF/PA6 composite and harmful to the friction and wear properties. The combination of PTFE and UHMWPE showed synergism on further reducing the friction coefficient of the composites filled with either PTFE or UHMWPE only. Effects of load and velocity on tribological behavior were also discussed. To further understand the wear mechanism, the worn surfaces were examined by scanning electron microscopy.
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Tribological and mechanical behaviors of polyamide 6/glass fiber composite filled with various Solid Lubricants
The Scientific World Journal, 2013Co-Authors: Du-xin Li, Yi-lan You, Wen Juan Li, Ying Xie, Xin DengAbstract:The effects of polytetrafluoroethylene (PTFE), graphite, ultrahigh molecular weight polyethylene (UHMWPE), and their compounds on mechanical and tribological properties of glass-fiber-reinforced polyamide 6 (PA6/GF) were studied. The polymeric materials were blended using twin-screw extruder and subsequently injection molded for test samples. Mechanical properties were investigated in terms of hardness, tensile strength, and impact strength. Friction and wear experiments were run under ambient conditions at a rotating speed of 200 rpm and load of 100 N. The morphologies of the worn surfaces were also observed with scanning electron microscope. The results showed that graphite could increase the tensile strength of PA6/GF-15 composite, but the material became soft. Graphite/UHMWPE complex Solid Lubricants were effective in increasing the already high impact strength of PA6/GF-15 composite. 5% PTFE gave the maximum reduction in the coefficient of friction. However, PTFE/UHMWPE complex Solid Lubricants were the best choice for improving both friction and wear behaviors due to the lower friction coefficient and mass wear rate. Moreover, the worn surface of PA6 composites revealed that adhesive wear, abrasive wear, and fatigue wear occurred in this study.
