Ceramics with high toughness, strength and hardness

Details Ceramics with high toughness, strength and hardness Ceramics with high toughness, strength and hardness

1989-04-07

1991-03-26

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501104, 501127, 501153, C04B 3548

Patent

active

050029118

ABSTRACT:
A ceramic comprising a matrix of Al.sub.2 O.sub.3, ZrO.sub.2 (partially or fully stabilized) or mixtures of Al.sub.2 O.sub.3 and ZrO.sub.2 with strontium aluminate plate-shaped grains distributed throughout the matrix results in a ceramic with high toughness, high strength and good hardness. SrO/Al.sub.2 O.sub.3 molar ratios between 0.02 and 0.20 result in in-situ formation of plate-shaped grains approximately 0.5 .mu.m in thickness and 5.0 .mu.m in breadth in tetragonal zirconia polycrystalline ceramic matrices. The in-situ formation of strontium aluminates allows high volume loading of platelets to occur and high toughness is achieved without the loss of strength. High alumina compositions have the added benefit of higher strength, lower thermal expansion, higher modulus and higher thermal conductivity than zirconia ceramics with comparable toughness.

REFERENCES:
patent: 3414418 (1968-12-01), Hubble et al.
patent: 4316964 (1982-02-01), Lange
patent: 4316964 (1982-02-01), Lange
patent: 4626518 (1986-12-01), Watanabe et al.
patent: 4643985 (1987-02-01), Ando et al.
patent: 4824815 (1989-04-01), Kugler
patent: 4843042 (1989-06-01), Dole et al.
J. Mater, Sci., (17), 225-263, (1982).
Tsukuma et al., "Mechanical Property and Microstructure of TZP and TZP/Al.sub.2 O.sub.3 Composites," Mat Res. Soc. Symp. PROC., vol. 78, pp. 123-135, (1987).

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