High strength Al.sub.2 O.sub.3

Compositions: ceramic – Ceramic compositions – Refractory

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Other Related Categories

501 12, 501105, 501153, 264 63, C04B 3510

Type

Patent

Status

active

Patent number

049525360

Description

ABSTRACT:
An extruded and sintered Al.sub.2 O.sub.3 body having high flexural strength is produced by extruding and sintering and extrusion mixture of alpha-Al.sub.2 O.sub.3 powder, an organic dispersing agent, an optional deaeration agent, and a zirconia sol. The zirconia sol is present in a small amount such that upon firing the final ZrO.sub.2 content of the final body is less than 1 weight percent. The sintered alumina body has a uniform distribution of ZrO.sub.2 particles in the size range of 0.1-1.0 microns.

REFERENCES:
patent: 4028453 (1977-06-01), Miller et al.
patent: 4218253 (1980-08-01), Dworak et al.
patent: 4316964 (1982-02-01), Lange
patent: 4419311 (1983-12-01), Calussen et al.
patent: 4429051 (1984-01-01), Davidge et al.
patent: 4784812 (1988-11-01), Saitoh et al.
Introduction to Ceramics, Kingery .COPYRGT.1960, Chap. 33, pp. 47-49.
"Influence with Small ZrO.sub.2 Additions on the Microstructure and Mechanical Properties of Al.sub.2 O.sub.3 ", Advances in Ceramics, vol. 24A: Science and Technology of Zirconia III, 1988, p. 423, (published by American Ceramic Society).
"Transient Thermal Stress Behavior in ZrO.sub.2 -Toughened Al.sub.2 O.sub.3 ", Journal of the American Ceramic Society, 64, No. 1, Jan. 1981, pp. 37-39.

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