Process for producing and product of a machinable crystallized g

Details Process for producing and product of a machinable crystallized g Process for producing and product of a machinable crystallized g

1987-02-13

1988-12-27

Kellogg, Arthur

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

65 17, 65 33, 501 10, C03C 1004

Patent

active

047940948

ABSTRACT:
A process for producing a machinable crystallized glass having needle-like crystals precipitated therein, which comprises melting a mixture comprising from 40 to 60 mol % of SiO.sub.2, from 6 to 16 mol % of Al.sub.2 O.sub.3, from 6 to 16 mol % of Y.sub.2 O.sub.3 and from 15 to 30 mol % of CaO, and allowing the melt to cool to have fine needle-like crystals of Ca.sub.4 Y.sub.6 O(SiO.sub.4).sub.6 precipitated.

REFERENCES:
patent: 3951670 (1976-04-01), Bush
patent: 3967969 (1976-07-01), Busby et al.
patent: 4396720 (1983-08-01), Beall et al.
patent: 4621066 (1986-11-01), Nishigaki et al.
patent: 4652534 (1987-03-01), Kasuga
Elastic Moduli and Refractive Indices of Aluminosilicate Glasses containing Y.sub.2 O.sub.3,La.sub.2 O.sub.3, and TiO.sub.2, "The American Ceramic Society", vol. 61, No. 5-6, May-Jun., 1978, Akio Makishima.
Synthesis of New Compounds with Apatite Structure, W. L. Wanmaker et al., "Philips Res. Repts 26", pp. 373-381, 1971.
"Phase Diagrams for Ceramists", pp. 138, 140, 1969 supplement.

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