Wear Behavior of a NiCr/AgVO3 Self-Lubricating Composite
来源期刊：Acta Metallurgica Sinica2013年第4期
论文作者：Wenting ZHANG Lingzhong DU Hao LAN Chuanbing HUANG Weigang ZHANG
文章页码：435 - 440
摘 要：NiCr/AgVO3 self-lubricating composite was prepared by powder cold-pressed method with the NiCr alloy as the matrix and 10 wt.% additive of AgVO3 as solid lubricant.The AgVO3 additive powder was synthesized by the precipitation method which exhibits a melting point of 460℃.Microstructure,phase composition and thermal properties of the AgVO3 powder,as well as the composite of NiCr/AgVO3 were analyzed using scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,X-ray diffraction（XRD） and differential scanning calorimeter（DSC）.The friction and wear behavior of the specimens from room temperature（R.T.） to 800℃ was evaluated using a ball-on-disk tribometer and 3D white light interference（WLI）.The results showed that the friction coefficient of this material under atmosphere decreases with temperature increasing from R.T.to 800℃.However,the wear rate firstly increases from R.T.to 200℃,almost remains stable from 200℃ to 600℃,and then decreases with further increasing the temperature up to 800℃.It is also found that the prepared composite materials show a better frictional behavior than NiCr alloy over the whole range of temperatures,which is mainly attributed to solid lubrication of AgVO3 exhibiting a lamella-slip structure at temperatures below 460℃ and forms liquid-film at elevated temperatures above the melting point.
Wenting ZHANG1,2，Lingzhong DU1，Hao LAN1，Chuanbing HUANG1，Weigang ZHANG1
1. State Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences2. University of Chinese Academy of Sciences
摘 要：NiCr/AgVO3 self-lubricating composite was prepared by powder cold-pressed method with the NiCr alloy as the matrix and 10 wt.% additive of AgVO3 as solid lubricant.The AgVO3 additive powder was synthesized by the precipitation method which exhibits a melting point of 460℃.Microstructure,phase composition and thermal properties of the AgVO3 powder,as well as the composite of NiCr/AgVO3 were analyzed using scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,X-ray diffraction（XRD） and differential scanning calorimeter（DSC）.The friction and wear behavior of the specimens from room temperature（R.T.） to 800℃ was evaluated using a ball-on-disk tribometer and 3D white light interference（WLI）.The results showed that the friction coefficient of this material under atmosphere decreases with temperature increasing from R.T.to 800℃.However,the wear rate firstly increases from R.T.to 200℃,almost remains stable from 200℃ to 600℃,and then decreases with further increasing the temperature up to 800℃.It is also found that the prepared composite materials show a better frictional behavior than NiCr alloy over the whole range of temperatures,which is mainly attributed to solid lubrication of AgVO3 exhibiting a lamella-slip structure at temperatures below 460℃ and forms liquid-film at elevated temperatures above the melting point.
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