Liquid impact and fracture of free-standing CVD diamond

Claire F. Kennedy; Robert H. Telling; John E. Field

doi:10.1117/12.354634

26 July 1999 Liquid impact and fracture of free-standing CVD diamond

Claire F. Kennedy, Robert H. Telling, John E. Field

Proceedings Volume 3705, Window and Dome Technologies and Materials VI; (1999) https://doi.org/10.1117/12.354634
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

The Cavendish Laboratory has developed extensive facilities for studies of liquid and solid particle erosion. This paper describes the high-speed liquid impact erosion of thin CVD diamond discs and the variation with grain sizes of the absolute damage threshold velocity (ADTV), viz., the threshold below which the specimen shows no damage. All specimens fail by rear surface cracking and there is shown to be a shallow dependence of rear surface ADTV on grain size. Fracture propagation in CVD diamond has also been monitored using a specially-designed double-torsion apparatus and data for K_1C are presented. Tentatively, the results suggest that finer-grained CVD diamond exhibits a higher fracture toughness, although the differences are slight even over a fourfold variation in the mean grain size. No preference for intergranular fracture was observed and one may conclude from this that the grain boundaries themselves do not seriously weaken the material. The large pre-existing flaws, both within and between grains, whose size varies the grain size are believed to be the dominant source of weakness.

Citation Download Citation

Claire F. Kennedy, Robert H. Telling, and John E. Field "Liquid impact and fracture of free-standing CVD diamond", Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); https://doi.org/10.1117/12.354634

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