DEVELOPMENT OF MoS_2-CONTAINING Ni-Cr BASED ALLOYS AND THEIR HIGH-TEMPERATURE TRIBOLOGICAL PROPERTIES

ＤＥＶＥＬＯＰＭＥＮＴＯＦＭｏＳ２ＣＯＮＴＡＩＮＩＮＧＮｉＣｒＢＡＳＥＤＡＬＬＯＹＳＡＮＤＴＨＥＩＲＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥＴＲＩＢＯＬＯＧＩＣＡＬＰＲＯＰＥＲＴＩＥＳ①ＸｉｏｎｇＤａｎｇｓｈｅｎｇＣｏｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌＥｌ...

B and MoS2containing NiCr based selflubricating materials were prepared by P/M hotpressing the mixture of alloyed NiCr powder, elemental Mo and B powders and MoS2 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, Cr3S4 and MoB; the wear debris are mainly composed of NiO, CrO, xNiO·MoO3·yH2O, Cr2O3 and nickelbased solid solution at 700 ℃; the NiCrMoB4MoS2 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-13m3/N·m.