Accession Number : ADA329396

Title :   Wear Particles of Single-Crystal Silicon Carbide in Vacuum

Descriptive Note : Technical paper

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Miyoshi, Kazuhisa ; Buckley, Donald H.

PDF Url : ADA329396

Report Date : FEB 1980

Pagination or Media Count : 24

Abstract : An investigation was conducted to examine the nature of fracture of silicon carbide and particle formation in wear. Sliding friction experiments were conducted with the single-crystal silicon carbide (0001) surface sliding in the <1010> direction in contact with various iron-based binary alloys. Experiments were conducted with a load of 0.2 N, at a sliding velocity of 3x10(exp-3) meter per minute in a vacuum of 10(exp-8) pascal at room temperature. The results of the investigation indicate that multi-angular and spherical wear particles of silicon carbide are observed as a result of multipass sliding. The multiangular wear particles are produced by primary and secondary cracking of cleavage planes (0001), (1010), or (1120) under the Hertzian stress field or local inelastic deformation zone at the interface. The spherical wear particles of silicon carbide may be produced by two mechanisms: (1) a penny-shaped fracture along the circular stress trajectories under the local inelastic deformation zone, and (2) attrition of wear particles.

Descriptors :   *SILICON CARBIDES, VACUUM, SINGLE CRYSTALS, FRACTURE(MECHANICS), WEAR, SLIDING FRICTION.

Subject Categories : Crystallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE