Fracture Toughening of High Pressure Sintered Diamond and Carbide CeramicsMaterials Science and Engineering Faculty Research & Creative Works
AbstractHigh pressure sintered bodies of polycrystalline diamond or carbide ceramics are rendered more resistant to cracking by establishing dispersed, localized "stress centers" of submicron size particles of lonsdaleite, diamond, or other form of metastable, high density carbon which has the capability of transforming crystallographically to graphite in situ in the body. When an incipient crack in the body approaches entrapped metastable particles along its path, the crack promotes or permits transformation of the metastable particles to graphite particles, with concomitant increase in their size, thereby resisting further propagation of the crack.
Department(s)Materials Science and Engineering
Patent Application Number07/383,590
Citation InformationP. D. Ownby. "Fracture Toughening of High Pressure Sintered Diamond and Carbide Ceramics" (1990)
Available at: http://works.bepress.com/p_ownby/146/