Alumina substrate and method of manufacturing same

Details Alumina substrate and method of manufacturing same Alumina substrate and method of manufacturing same

1975-07-14

1977-08-30

Douglas, Winston A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

106 65, 106 734, 264102, C04B 3564, C04B 3510

Patent

active

040454126

ABSTRACT:
An improved alumina substrate comprising alumina and magnesium oxide has a surface finish of no more than 0.05 .mu.m CLA and a density of at least 3.90 g/cm.sup.3 in an as-fired condition and is composed of alumina grains which are sufficiently grown to have straight grain boundaries and flat surfaces to form a surface of the substrate. The improved substrate is produced by firing a green sheet having a high content of raw material powder and a density of more than 2.60 g/cm.sup.3 at a temperature of 1525.degree. to 1650.degree. C. The green sheet with high density is formed by the process of aggregating an organic agent and a high purity alumina powder by dry milling and casting the resultant slip.

REFERENCES:
patent: 3026210 (1962-03-01), Coble
patent: 3141786 (1964-07-01), Bugosh
patent: 3311482 (1967-03-01), Klingler et al.
patent: 3698923 (1972-10-01), Stetson et al.
patent: 3854965 (1974-12-01), Niwa et al.

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