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Fracture Toughening of High Pressure Sintered Diamond and Carbide Ceramics
Materials Science and Engineering Faculty Research & Creative Works
  • P. D. Ownby, Missouri University of Science and Technology
Abstract
High 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 Number
07/383,590
Patent Number
4968647
Document Type
Patent
Document Version
Citation
File Type
text
Language(s)
English
Publication Date
11-1-1990
Citation Information
P. D. Ownby. "Fracture Toughening of High Pressure Sintered Diamond and Carbide Ceramics" (1990)
Available at: http://works.bepress.com/p_ownby/146/