Compositions: ceramic – Ceramic compositions – Refractory
Patent
1984-06-27
1985-11-12
McCarthy, Helen M.
Compositions: ceramic
Ceramic compositions
Refractory
264 60, 264 66, 264 82, 501 94, 501128, 501152, C04B 3510, C04B 3548
Patent
active
045528527
ABSTRACT:
A ceramic composed of 1 to 15 percent of glass and 99 to 85 percent of a mixture of particulates is disclosed. The glass, present as a vitreous phase bonding the particulates into a dense, gas impervious structure, contains 45 to 80 percent of SiO.sub.2, 8 to 65 percent of CaO and MgO and not more than 15 percent of Al.sub.2 O.sub.3. The particulates, which are finer than 15 microns in ultimate particle size, include Al.sub.2 O.sub.3 and at least one of ZrO.sub.2, HfO.sub.2 and solid solutions of the two. The ceramics are subject to microcracking, which can be cured by refiring, or prevented by including particulate Y.sub.2 O.sub.3 as a stabilizer.
REFERENCES:
patent: 3360203 (1967-12-01), Smoke et al.
patent: 3615763 (1971-10-01), Flock
patent: 4279654 (1981-07-01), Yajima et al.
patent: 4313900 (1982-02-01), Gonzales
patent: 4316964 (1982-02-01), Lange
patent: 4421861 (1983-12-01), Claussen et al.
Butler, E. P. et al., "X-Ray Microanalysis of ZrO.sub.2 Particles in ZrO.sub.2 Toughened Al.sub.2 O.sub.3 ", Commun. of Am. Cer. Soc., _Dec. 1982, pp. C206-C207.
Champion Spark Plug Company
McCarthy Helen M.
Purdue John C.
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