Plasma-Sprayed Metal-Glass and Metal-Glass Fluoride Coatings for Lubrication to 900 C

Abstract

Plasma-sprayed composites, which have good oxidation-resistance and self-lubricating characteristics to 900 C, were developed. The composites are a nichrome matrix containing dispersed glass for oxidation protection and calcium fluoride for lubrication; they are applied to bearing surfaces by plasma spraying layers about 0.050 centimeters thick which are then machined to 0.025 centimeters. Oscillating bearing tests were performed in air to 900 C at unit radial loads up to 3.5 × 10⁷ N/M² (5,000 psi) and a thrust load of 1960N (440 lbs). Bearings with a composite liner in the bore were in good condition after over 50,000 oscillating cycles accumulated during repeated, bearing temperatures cycles between 25 and 900 C.

Presented at the 29th Annual Meeting in Cleveland, Ohio, April 28—May 2, 1974

Notes

Presented at the 29th Annual Meeting in Cleveland, Ohio, April 28—May 2, 1974