Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1994-12-23
1996-01-23
Group, Karl
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 42, C03C 1002, C03C 3253
Patent
active
054864950
ABSTRACT:
A germanate glass ceramic article which has better thermal and physical perties than the competing materials of zinc sulfide, spinel, and sapphire is made by mixing germanate ceramic glass components; melting the components to form a molten mass; cooling the molten mass to form a solid glass article; nucleating the solid article by heating it in the range of about 630.degree.-790.degree. C. for about 1-16 hours to develop nuclei in the article; and crystallizing the nucleated article by heating it, after nucleation, in the range of about 1/2 minute to about 8 hours to grow the nuclei to crystallites having an average diameter of less then about 1000 nanometer (nm); and cooling to form the glass ceramic.
REFERENCES:
patent: 4703019 (1987-10-01), Abe et al.
patent: 5305414 (1994-04-01), Higby et al.
Aggarwal Ishwar D.
Bayya Shyam S.
Harbison Barry B.
Jewell John M.
Group Karl
Kap George A.
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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