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Tribological and microstructural investigation of the PM200 series of self-lubricating composites

机译：pm200系列自润滑复合材料的摩擦学和显微组织研究

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An investigation of the effects of processing compositional variations on the tribological, microstructural, and compressive strength characteristics of PM212 is described. PM212 is a self-lubricating composite, comprised of a wear resistant metal bonded chromium carbide matrix, containing the solid lubricants barium fluoride/calcium fluoride eutectic and silver. Several alternate composites were formulated which had lubricant and matrix variations. Processing variations included sintering and hot isostatic pressing (HIPping). Pinon-disk tests were used to screen the alternates for friction and wear properties. Several of the chromium carbide-based self-lubrication composites exhibited low friction and wear in sliding against a nickel-based superalloy. One specific composition contained gold in place of silver to minimize the potential reactivity of the composite with possible environmental contaminants such as sulfur. This formulation also resulted in a composite with good tribological properties. The results indicate that several of these composites have potential use as sliding bearing and seal materials in operation from 25 C to temperatures as high as 900 C. The good tribological performance by several different composites showed that the composition of PM212 can be altered without dramatically affecting performance.

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