Alumina ceramic comprising a siliceous binder and at least...

Details Alumina ceramic comprising a siliceous binder and at least... Alumina ceramic comprising a siliceous binder and at least...

C - Chemistry, Metallurgy

04

B

261/24

C04B 35/10 (2006.01) C04B 35/119 (2006.01)

Patent

CA 1232620

ABSTRACT OF THE DISCLOSURE 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 SiO2, 8 to 65 percent of CaO and MgO and not more than 15 percent of Al203. The particulates, which are finer than 15 microns in ultimate particle size, include Al203 and at least one of ZrO2, HfO2 and solid solutions of the two. The ceramics are subject to microcracking, which can be cured by refiring, or prevented by including particulate Y203 as a stabilizer.

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