Some Topographical and Tribological Characteristics of a CaF₂/BaF₂ Eutectic-Containing Porous Nichrome Alloy Self-Lubricating Composite

Abstract

Scanning electron photomicrography, x-ray energy dispersion spectroscopy and metallographic sectioning techniques were combined to determine some topographical and tribological characteristics of a high temperature, self-lubricating composite. This bearing material consists of a porous nichrome alloy matrix, vacuum impregnated with a CaF₂-BaF₂ eutectic. The results indicate that a specific, multistep post-machining treatment of a composite part may be advantageous for effective high temperature service. Unique topographical and compositional changes of the sliding surfaces of the composite were observed after short term, low load use at a 1,200 F temperature in a helium environment. The data, as represented by high magnification photomicrographs and x-ray spectra, can be used as inspection tools (visual standards) for examining parts machined from the subject bearing material.

Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference held in Montreal, Canada, October 8–10, 1974

Notes

Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference held in Montreal, Canada, October 8–10, 1974