Partially stabilized zirconia ceramics

Details Partially stabilized zirconia ceramics Partially stabilized zirconia ceramics

1980-01-04

1981-07-21

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

264 65, 423265, 423266, 423608, C04B 3548, C01G 2502, C01G 2702

Patent

active

042796555

ABSTRACT:
A magnesia partially stabilized zirconia ceramic material possessing from about 2.8 to about 4.0 wt percent magnesia, and made from a zirconia powder containing no more than about 0.03 percent silica is described. The ceramic material has a microstructure, produced as a consequence of the method by which the material is made, which provides both high strength and good thermal shock resistance properties. This microstructure comprises grains of cubic stabilized zirconia within which are formed, during cooling from the firing temperature, precipitates of tetragonal zirconia. These precipitates are elliptical in shape, with a long axis of about 1500 Angstrom units. Additionally, some of the tetragonal zironcia precipitates are made to transform into a non-twinned microcrystalline monoclinic form of zirconia by reducing the temperature of the material to below 800.degree. C., then subsequently holding the material at a temperature in the range from 1000.degree. C. to about 1400.degree. C. The ceramic material may also contain up to 36 wt percent of hafnia. Such materials can be used for, inter alia, moulds, dies, tappet facings and cutting tools.

REFERENCES:
patent: 3334962 (1967-08-01), Clearfield
patent: 3514252 (1970-05-01), Levy et al.
Rychkewitch, E.; "Oxide Ceramics" Academic Press, New York & London 1960 pp. 354-360.
Rieth, P. et al.; "Fabrication and Flexural Strength of Ultra-Fine-Grained Yttria-Stabilized Zirconia"; Bulletin American Ceramic Society, vol. 55 p. 717, 1976.

Affiliated with

Also associated with

Rating

Partially stabilized zirconia 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 Partially stabilized zirconia ceramics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Partially stabilized zirconia ceramics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2432828