High strength high toughness TiB.sub.2 ceramics

Details High strength high toughness TiB.sub.2 ceramics High strength high toughness TiB.sub.2 ceramics

1989-06-22

1990-06-12

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 88, 501 89, 501 87, 501 91, 501 96, C04B 3556, C04B 3558

Patent

active

049333089

ABSTRACT:
A ceramic sintered body comprising TiB.sub.2 as the principal component, 0.5 to 30 wt. % of SiC and 2 to 40 wt. % of ZrO.sub.2. In some cases ZrO.sub.2 includes stabilizers for tetragonal crystal, such as Y.sub.2 O.sub.3, MgO or CeO.sub.2. The sintered body has a dense structure where TiB.sub.2, ZrO.sub.2 and SiC uniformly disperse. ZrO.sub.2 is located at the grain boundary of TiB.sub.2, and inhibits the grain growth of TiB.sub.2 as well as improves the strength of the sintered body by binding it to TiB.sub.2 strongly. SiC is located not only at the grain boundary but also on the inside of both grains. Since the contract of SiC during cooling process of the sintered body is less than TiB.sub.2 and ZrO.sub.2, compressive stress is produced in SiC and around thereof. The sintered body is remarkably strengthened by the residual compressive stress, and simultaneously, the high fracture toughness is also achieved.

REFERENCES:
patent: 4555358 (1985-11-01), Matsushita et al.
patent: 4762810 (1988-08-01), Endo et al.
patent: 4837231 (1989-06-01), Endo et al.

Affiliated with

Also associated with

Rating

High strength high toughness TiB.sub.2 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 High strength high toughness TiB.sub.2 ceramics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High strength high toughness TiB.sub.2 ceramics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-617156