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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 2    June 1998

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DEVELOPMENT OF MoS2- CONTAINING Ni-Cr BASED ALLOYS AND THEIR HIGH-TEMPERATURE TRIBOLOGICAL PROPERTIES
Xiong Dangsheng1  Peng Chaoqun2 and Huang Qizhong2

1.College of Mechanical Electronic Engineering,China University of Mining and Technology, Xuzhou 221008, P. R. China;
 
2.State Key Lab for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China

Abstract:B-and MoS2-containing Ni-Cr based self-lubricating materials were prepared by P/M hotpressing the mixture of alloyed Ni-Cr powder, elemental Mo and B powders and MoS2 powder. The phase constituents were analysed using an X-ray diffractometer, and the hardness was measured using a Brinell’s machine. The friction coefficients and wear rates of the studied materials were determined by means of pin-on-disc tribometer. The results showed that the studied materials are mainly composed of Ni-based solid solution, Cr3S4 and MoB; the wear debris are mainly composed of NiO, CrO,xNiO·MoO3·yH2O, Cr2O3 and nickel-based solid solution at 700℃; the Ni-Cr-Mo-B-4MoS2 alloy has the best tribological properties, over a wide range of temperature from 20℃to 700℃, its friction coefficient is 0.14~0.26 and its wear rate is 1.6×10-14~1.2×10-13m3/N·m.

 

Key words: Ni-Cr based alloy self-lubricating tribological properties high-temperature

ISSN 1672-7029
CN 43-1423/U

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