Process for manufacturing an alumina substrate by acid purifying

Details Process for manufacturing an alumina substrate by acid purifying Process for manufacturing an alumina substrate by acid purifying

1978-10-30

1980-08-12

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

106 734, C01F 702, C04B 3544

Patent

active

042173370

ABSTRACT:
Disclosed is an alumina substrate having a high density, a high degree of surface smoothness and excellent dielectric properties and a process for its manufacture. The process comprises prefiring a green sheet prepared from alumina powder at an elevated temperature, for example between 1200.degree. and 1350.degree. C., to remove combustible substances from the sheet, treating the resultant prefired substrate with an acid aqueous solution to eliminate acid-soluble and decomposable substances from the substrate, and firing the acid-treated substrate at an elevated temperature, for example between 1500.degree. and 1650.degree. C.

REFERENCES:
patent: 1950883 (1934-03-01), Gitzen
patent: 3854965 (1974-12-01), Niwa et al.
patent: 4045412 (1977-08-01), Yamada et al.

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