Tribological Properties of PM212: A High-Temperature, Self-Lubricating, Powder Metallurgy Composite
Tribological Properties of PM212: A High-Temperature, Self-Lubricating, Powder Metallurgy Composite
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发表时间：
1990
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通讯作者：
C. Dellacorte;H. Sliney
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作者：
C. Dellacorte;H. Sliney
本文介绍了一种新型高温自润滑粉末冶金复合材料PM212的研制和评价。PM 212具有与等离子喷涂涂层PS 212相同的组成，其含有70重量%的金属结合碳化铬、15重量%的银和15重量%的氟化钡/氟化钙共晶。碳化物用作耐磨基体，银和氟化物分别用作低温和高温润滑剂。该材料采用冷压、冷等静压和烧结工艺制备。在这项研究中，半球形尖端磨损销的PM 212的制备和滑动对高温合金盘在空气中的温度从25到850 C在销-盘摩擦试验机。摩擦系数范围为0.29至0.38，复合销和高温合金盘的磨损在10（exp-5）至10（exp-6）立方mm/N-m范围内为中等至低。初步测试表明，该材料在25至900 ℃的整个温度范围内具有至少130 MPa的抗压强度。这种材料有希望用作密封插入件、衬套、小内径部件和等离子喷涂涂层不切实际或成本太高的其他应用。
This paper describes a research program to develop and evaluate a new high temperature, self-lubricating powder metallurgy composite, PM212. PM212 has the same composition as the plasma-sprayed coating, PS212, which contains 70 wt percent metal-bonded chromium carbide, 15 wt percent silver and 15 wt percent barium fluoride/calcium fluoride eutectic. The carbide acts as a wear resistant matrix and the silver and fluorides act as low and high temperature lubricants, respectively. The material is prepared by sequential cold press, cold isostatic pressing and sintering techniques. In this study, hemispherically tipped wear pins of PM212 were prepared and slid against superalloy disks at temperatures from 25 to 850 C in air in a pin-on-disk tribometer. Friction coefficients range from 0.29 to 0.38 and the wear of both the composite pins and superalloy disks was moderate to low in the 10(exp -5) to 10(exp -6) cubic mm/N-m range. Preliminary tests indicate that the material has a compressive strength of at least 130 MPa over the entire temperature range of 25 to 900 C. This material has promise for use as seal inserts, bushings, small inside diameter parts and other applications where plasma-sprayed coatings are impractical or too costly.