Fracture toughening of sintered diamond and carbide ceramics

Details Fracture toughening of sintered diamond and carbide ceramics Fracture toughening of sintered diamond and carbide ceramics

1989-07-24

1990-11-06

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 86, 501 87, 501 91, 423445, C22C 2600

Patent

active

049686470

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.

REFERENCES:
patent: 3876751 (1975-04-01), Alexeevsky et al.
patent: 4394170 (1983-07-01), Sawsoka et al.
patent: 4695321 (1987-09-01), Akashi et al.
patent: 4771022 (1988-09-01), Block et al.
Heuer and Ruhle, "Advances in Ceramics", vol. 12, Science and Technology of Zirconia II, pp. 1-32.
Green, Hannink and Swain, Transformation Toughening of Ceramics, CRC Press (1989), pp. 1-55 and 157-197.
J. A. Cer. Soc., vol. 68, pp. C36-C37 (1985).

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