Abstract
The effect of sharp particle erosion on the strength and wear of silicon-alloyed pyrolytic carbon was studied. Contact damage at Vickers and Knoop indentations was also examined for comparison with damage at single-particle impact sites. It was found that pyrolytic carbon behaves much differently from most other brittle materials in that even at indentation loads up to 445 N, radial and lateral cracks were not produced. Single-particle impact sites showed a similar lack of radial and lateral crack formation, but did exhibit surface pit formation due to microfracture within, and spalling of, the contact zone. The steady-state erosion rate was similar to that of other polycrystalline ceramic materials. Post-erosion strength and strength variability decreased with increasing particle kinetic energy.
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