目的研究高镍钛基合金(TiNi)的摩擦学性能以提高其使用精度和服役寿命。方法以TiNi为研究对象,结合仿生学方法在TiNi表面设计并制备了鱼鳞状表面织构。随后将复合固体润滑剂Sn AgCu-Al_(2)O_(3)(S-A)均匀填充至织构,使用摩擦磨损测试仪...目的研究高镍钛基合金(TiNi)的摩擦学性能以提高其使用精度和服役寿命。方法以TiNi为研究对象,结合仿生学方法在TiNi表面设计并制备了鱼鳞状表面织构。随后将复合固体润滑剂Sn AgCu-Al_(2)O_(3)(S-A)均匀填充至织构,使用摩擦磨损测试仪对制备的样品进行摩擦实验。最后利用场发射扫描电子显微镜和三维表面形貌仪对磨痕表面进行表征,重点分析表面织构的角度参数对复合材料Sn Ag Cu-Al_(2)O_(3)/TiNi(S-A/TiNi)摩擦学性能的影响。结果与TiNi相比,当表面织构的角度为70°时,S-A/TiNi-70°的平均摩擦因数和磨损率分别降低约81.8%和85.5%,其值分别约为0.1和1.2×10^(-13)m^(3)/(N·m)。结论研究过程中发现,S-A/TiNi-70°试样表现的优异摩擦学性能依赖于S-A固体润滑膜的完整性,摩擦表面形成的固体润滑膜越连续其表面磨损越小。S-A/TiNi-70°试样优异的摩擦学性能主要归因于在表面织构角度为70°时,织构凹槽中的S-A固体润滑剂相较于其他角度更容易流动。这导致织构凹槽中的润滑剂能够大量迁移到摩擦表面形成S-A固体润滑膜,从而减少了摩擦副和基体直接接触。展开更多
Wear behaviors of a peak-aged Cu-15Ni-8Sn alloy fabricated by powder metallurgy were investigated.The results indicated that the friction coefficients and the wear rates of Cu-15Ni-8Sn alloy within a normal load range...Wear behaviors of a peak-aged Cu-15Ni-8Sn alloy fabricated by powder metallurgy were investigated.The results indicated that the friction coefficients and the wear rates of Cu-15Ni-8Sn alloy within a normal load range of 50−700 N and a sliding speed range of 0.05−2.58 m/s were less than 0.14 and 2.8×10−6 mm3/mm,respectively.Stribeck-like curve and wear map were developed to describe the oil-lubrication mechanism and wear behavior.The equation of the dividing line between zones of safe and unsafe wear life was determined.Lubricating oil was squeezed into micro-cracks under severe wear conditions.In addition,the lubricating oil reacted with Cu-15Ni-8Sn alloy to generate the corresponding sulfides,which hindered the repair of micro-cracks,promoted cracks growth,and led to delamination.This work has established guidelines for the application of the Cu-15Ni-8Sn alloy under oil-lubricated conditions through developing wear map.展开更多
The tribological behaviors of Cu-15Ni-8Sn/graphite composites with the graphite content of 38 vol.%against AISI321 stainless steel under dry-sliding,deionized water and sea water were investigated on a block-on-ring c...The tribological behaviors of Cu-15Ni-8Sn/graphite composites with the graphite content of 38 vol.%against AISI321 stainless steel under dry-sliding,deionized water and sea water were investigated on a block-on-ring configuration.The results indicated that the friction coefficient was the lowest under dry-sliding,and the highest in deionized water.The wear rate decreased to reach the minimum value of 1.39×10-15 m^(3)/(N·m)in sea water and in deionized water,it increased to the maximum value of 5.56×10-15 m^(3)/(N·m).The deionized water hindered the formation of tribo-oxide layer and lubricating film,which resulted in the largest friction coefficient and wear rate.In sea water,however,the corrosion products comprised of oxides,hydroxides and chlorides were found on the worn surface,and the compacted layer composed of corrosion products and graphite played an important role in keeping the excellent wear resistance.It was elucidated that the tribological behaviors of Cu-15Ni-8Sn/graphite composite were powerful influenced by the friction environments.展开更多
Tribological behavior of Cu-15Ni-8Sn(mass fraction, %) alloy against GCr15 ring under various loads was investigated on a ring-on-block tester in oil lubrication. The results showed that the wear rate increased slowly...Tribological behavior of Cu-15Ni-8Sn(mass fraction, %) alloy against GCr15 ring under various loads was investigated on a ring-on-block tester in oil lubrication. The results showed that the wear rate increased slowly from 1.7×10^(-7) to 9.8× 10^(-7) mm^3/mm under the load lower than 300 N, and then increased dramatically to the climax of 216×10^(-7) mm^3/mm under the load over 300 N, which indicated the transition of wear mechanism with the increase of applied load. The wear mechanism mainly was plastic deformation and abrasive wear under the load less than 300 N. As the applied load was more than 300 N, the wear mechanism of Cu-15Ni-8Sn alloy primarily was delamination wear. Besides, the transition can also be confirmed from the different morphologies of worn surface, subsurface and wear debris. It is distinctly indicated that the appearance of flaky debris at the applied load over 300 N may be a critical point for the change of wear mechanism.展开更多
文摘目的研究高镍钛基合金(TiNi)的摩擦学性能以提高其使用精度和服役寿命。方法以TiNi为研究对象,结合仿生学方法在TiNi表面设计并制备了鱼鳞状表面织构。随后将复合固体润滑剂Sn AgCu-Al_(2)O_(3)(S-A)均匀填充至织构,使用摩擦磨损测试仪对制备的样品进行摩擦实验。最后利用场发射扫描电子显微镜和三维表面形貌仪对磨痕表面进行表征,重点分析表面织构的角度参数对复合材料Sn Ag Cu-Al_(2)O_(3)/TiNi(S-A/TiNi)摩擦学性能的影响。结果与TiNi相比,当表面织构的角度为70°时,S-A/TiNi-70°的平均摩擦因数和磨损率分别降低约81.8%和85.5%,其值分别约为0.1和1.2×10^(-13)m^(3)/(N·m)。结论研究过程中发现,S-A/TiNi-70°试样表现的优异摩擦学性能依赖于S-A固体润滑膜的完整性,摩擦表面形成的固体润滑膜越连续其表面磨损越小。S-A/TiNi-70°试样优异的摩擦学性能主要归因于在表面织构角度为70°时,织构凹槽中的S-A固体润滑剂相较于其他角度更容易流动。这导致织构凹槽中的润滑剂能够大量迁移到摩擦表面形成S-A固体润滑膜,从而减少了摩擦副和基体直接接触。
基金Projects(2017YFB0306105,2018YFE0306100)supported by the National Key Research and Development Program of China
文摘Wear behaviors of a peak-aged Cu-15Ni-8Sn alloy fabricated by powder metallurgy were investigated.The results indicated that the friction coefficients and the wear rates of Cu-15Ni-8Sn alloy within a normal load range of 50−700 N and a sliding speed range of 0.05−2.58 m/s were less than 0.14 and 2.8×10−6 mm3/mm,respectively.Stribeck-like curve and wear map were developed to describe the oil-lubrication mechanism and wear behavior.The equation of the dividing line between zones of safe and unsafe wear life was determined.Lubricating oil was squeezed into micro-cracks under severe wear conditions.In addition,the lubricating oil reacted with Cu-15Ni-8Sn alloy to generate the corresponding sulfides,which hindered the repair of micro-cracks,promoted cracks growth,and led to delamination.This work has established guidelines for the application of the Cu-15Ni-8Sn alloy under oil-lubricated conditions through developing wear map.
基金Project(51674304) supported by the National Natural Science Foundation of ChinaProject(19B430013) supported by the Key Scientific Research Projects of Higher Education Institutions in Henan Province,ChinaProject(2017BSJJ013) supported by the Doctor Research Foundation of Zhengzhou University of Light Industry,China
文摘The tribological behaviors of Cu-15Ni-8Sn/graphite composites with the graphite content of 38 vol.%against AISI321 stainless steel under dry-sliding,deionized water and sea water were investigated on a block-on-ring configuration.The results indicated that the friction coefficient was the lowest under dry-sliding,and the highest in deionized water.The wear rate decreased to reach the minimum value of 1.39×10-15 m^(3)/(N·m)in sea water and in deionized water,it increased to the maximum value of 5.56×10-15 m^(3)/(N·m).The deionized water hindered the formation of tribo-oxide layer and lubricating film,which resulted in the largest friction coefficient and wear rate.In sea water,however,the corrosion products comprised of oxides,hydroxides and chlorides were found on the worn surface,and the compacted layer composed of corrosion products and graphite played an important role in keeping the excellent wear resistance.It was elucidated that the tribological behaviors of Cu-15Ni-8Sn/graphite composite were powerful influenced by the friction environments.
基金Project(2016YFB0301402)supported by the National Key Research and Development Program of ChinaProject(CSU20151024)supported by the Innovation-driven Plan in Central South University,China
文摘Tribological behavior of Cu-15Ni-8Sn(mass fraction, %) alloy against GCr15 ring under various loads was investigated on a ring-on-block tester in oil lubrication. The results showed that the wear rate increased slowly from 1.7×10^(-7) to 9.8× 10^(-7) mm^3/mm under the load lower than 300 N, and then increased dramatically to the climax of 216×10^(-7) mm^3/mm under the load over 300 N, which indicated the transition of wear mechanism with the increase of applied load. The wear mechanism mainly was plastic deformation and abrasive wear under the load less than 300 N. As the applied load was more than 300 N, the wear mechanism of Cu-15Ni-8Sn alloy primarily was delamination wear. Besides, the transition can also be confirmed from the different morphologies of worn surface, subsurface and wear debris. It is distinctly indicated that the appearance of flaky debris at the applied load over 300 N may be a critical point for the change of wear mechanism.
