Alumina porcelain compositions

Details Alumina porcelain compositions Alumina porcelain compositions

1986-01-31

1988-01-19

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501153, C04B 3510, C04B 3546

Patent

active

047204710

ABSTRACT:
A sintered alumina porcelain composition is described consisting of a ternary composition consisting of from 96 to 99 mol % of Al.sub.2 O.sub.3 and the remainder consisting of CaO and TiO.sub.2 present in a CaO/TiO.sub.2 molar ratio of from 0.8/1 to 1.1/1 and SiO.sub.2, wherein based on 100 parts by weight of the ternary Al.sub.2 O.sub.3 --CaO--TiO.sub.2 composition, SiO.sub.2 is present in an amount within the range defined by the area within the straight lines connecting points A-B-C-D-E-F-A in the composition diagram set forth in the attached drawing for describing the relationship between the SiO.sub.2 content and the Al.sub.2 O.sub.3 molar ratio, provided that point A is excluded from the range of the SiO.sub.2 content, with said points having the following locations:

REFERENCES:
patent: 3615307 (1971-10-01), Jones
patent: 4177235 (1979-12-01), Neidhardt et al.
patent: 4430440 (1984-02-01), Wada et al.
patent: 4542111 (1985-09-01), Buran et al.

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