Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1991-09-30
1995-02-14
Green, Anthony
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 8, 65 173, 164 39, 432262, C03C 1014, C03B 3700
Patent
active
053895827
ABSTRACT:
Unique cristobalite-seeded quartz glass crucibles and cores admirably suited for Cz crystal growing and D.S. metal casting are formed by slip casting using a slurry containing a quartz refractory composition comprising silica particles with an average particle size of from 1 to 10 microns and a minute but effective amount of micronized dispersible particles of a unique crystallization aid, such as basic aluminum acetate, which provides the glass with at least 0.005 percent by weight of evenly dispersed metallic ions. The metallic ions provide the quartz glass with nucleation sites so that heating of the glass to a temperature of from 1200.degree. C. to 1250.degree. C. permits formation of a high concentration of evenly dispersed cristobalite nuclei in the glass without causing excessive devitrification prior to cooling of the seeded glass. The desired nucleation sites can also be provided by using micronized particles of alpha quartz or alpha cristobalite.
REFERENCES:
patent: 3557575 (1971-01-01), Beall
patent: 3652248 (1972-03-01), Loxley et al.
patent: 3776809 (1973-12-01), Baumler et al.
patent: 3799836 (1974-03-01), Rogers et al.
patent: 3881945 (1975-05-01), Trojer et al.
patent: 3929497 (1975-12-01), Clark-Monks
patent: 3972704 (1976-08-01), Loxley et al.
patent: 4008094 (1977-02-01), Beall et al.
patent: 4042362 (1977-08-01), MacDowell et al.
patent: 4093017 (1978-06-01), Miller et al.
patent: 4199336 (1980-04-01), Rittler
patent: 5053359 (1991-10-01), Loxley et al.
"Glass: Science and Technology", vol. 1, 1983, pp. 122-123, 128-129, 147, 182, 415, 442 and 443 (No Month).
"Fiberglass", Mohr et al, 1978, pp. 122-124 and 205-207 (No Month).
"Encyclopedia of Chem. Tech.", Kirk Othmer, 3rd Ed., 1979 pp. 693-694 (No Month).
"Handbook of Glass Manufacture", Tooley, 1974, pp. 742-745, 901, 934 and 935 (No Month).
Blackmer John F.
Loxley Ted A.
Green Anthony
Greene Vincent A.
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