Ceramic materials by sol-gel route

Details Ceramic materials by sol-gel route Ceramic materials by sol-gel route

1982-03-09

1984-01-31

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

264 13, 501 94, 501105, 501127, C04B 3502

Patent

active

044290519

ABSTRACT:
Sintered materials are known comprising a ceramic matrix (e.g. of Al.sub.2 O.sub.3) and, distributed therein, a refractory material in a metastable, high temperature enantiotropic form of higher density than its room temperature enantiotropic form such as ZrO.sub.2 which has a metastable tetragonal form and a room temperature monoclinic form. The sintered materials have enhanced fracture and bending strength.
The invention provides a method of making such materials from a mixture where the refractory material and optionally the ceramic material are in the form of a sol. The mixture is dried and subsequently sintered to give a product where the refractory material is distributed very uniformly and in its metastable form. Improved properties have been obtained by including a stabilizing agent (e.g. Y.sub.2 O.sub.3) in the final product.

REFERENCES:
patent: 3518050 (1970-06-01), Woodhead
patent: 3704147 (1972-11-01), Hardy et al.
patent: 3862908 (1975-01-01), Fitch et al.
patent: 4218253 (1980-08-01), Dworak et al.
patent: 4298385 (1981-11-01), Claussen
patent: 4314827 (1982-02-01), Leitheiser et al.
patent: 4316964 (1982-02-01), Lange
patent: 4331048 (1982-05-01), Dworak et al.
Rieth, P. H. et al., "Fabrication and Flexural Strength of Ultrafine-grained Yttria-Stabilized Zirconia", Cer Bull 55 (8), Aug. 1976, pp. 717-721, 727.
Palmour, H. et al., Processing of Crystalline Ceramics, Plenum Press, NYC, (1978).
"Ceramics Sintered Directly from Sol-Gels", by Becher, P. F. et al., pp. 79-85, Materials Science Research, vol. 11.

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