Title

Fracture Toughening of High Pressure Sintered Diamond and Carbide Ceramics

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


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