Compositions: ceramic – Ceramic compositions – Refractory
Patent
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).
Curators of the University of Missouri
Dixon Jr. William R.
Gallo Chris
LandOfFree
Fracture toughening of sintered diamond and carbide ceramics does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fracture toughening of sintered diamond and carbide ceramics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fracture toughening of sintered diamond and carbide ceramics will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1306829