Wear Behavior of a NiCr/AgVO3 Self-Lubricating Composite

doi:10.1007/s40195-013-0109-9

Acta Metallurgica Sinica (English Letters) ›› 2013, Vol. 26 ›› Issue (4): 435-440.DOI: 10.1007/s40195-013-0109-9

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Wear Behavior of a NiCr/AgVO₃ Self-Lubricating Composite

Wenting ZHANG^1,2), Lingzhong DU¹⁾, Hao LAN¹⁾, Chuanbing HUANG¹⁾, Weigang ZHANG¹⁾

1)State Key Laboratory ofMulti-phase Complex Systems, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China
2)University of Chinese Academy of Sciences, Beijing 100049, China

Received:2013-02-27 Revised:2013-03-23 Online:2013-08-25 Published:2013-07-11
Contact: Weigang ZHANG
Supported by:
National Natural Science Foundation of China (Nos.50901071 and 51001093) and the Natural Science Foundation of Jiangsu Province, China (No.BK2011452).

Abstract

Abstract:

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.

Key words: Silver vanadate (AgVO₃), NiCr alloy, Solid lubricant, Tribological property

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.

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Wear Behavior of a NiCr/AgVO₃ Self-Lubricating Composite

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