Acta Metallurgica Sinica (English Letters) >
Wear Behavior of a NiCr/AgVO3 Self-Lubricating Composite
Received date: 2013-02-27
Revised date: 2013-03-23
Online published: 2013-07-11
Supported by
National Natural Science Foundation of China (Nos.50901071 and 51001093) and the Natural Science Foundation of Jiangsu Province, China (No.BK2011452).
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 ZHANG , Lingzhong DU , Hao LAN , Chuanbing HUANG , Weigang ZHANG . Wear Behavior of a NiCr/AgVO3 Self-Lubricating Composite[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(4) : 435 -440 . DOI: 10.1007/s40195-013-0109-9
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