Low expansion ceramic material

Details Low expansion ceramic material Low expansion ceramic material

1984-06-01

1987-06-23

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 94, 501106, 501132, 501134, 501135, 501136, 501154, 423306, 423472, 350320, C04B 3502

Patent

active

046753028

ABSTRACT:
A low expansion ceramic composition is represented by the formula Ca.sub.0.5 Ti.sub.2 P.sub.3 O.sub.12 in which up to 100 percent of the Ca is replaced by one or more of the other alkaline earth metals and alkali metals, the alkali metals being selected from the group consisting of Na, Li, K and combinations thereof and substituted in the ratio of two units of alkali metal for each unit of Ca replaced. Up to 100 percent of the Ti is replaced by one or more members selected from the group consisting of Zr, Sn, Nb, Ta and Cr. For each unit of Cr replacement an approximately equal unit of alkali metal is added. For each unit of Nb and/or Ta replacement an approximately equal unit of Na and/or K replaces a unit of Ca. Up to 100 percent of the P may be replaced by Si and/or S. The total of the amounts of Ca, other alkaline earth metals, Li, K, Ti, Sn, Nb, Ta and Cr is greater then zero. Preferably up to 100 percent of the Ca is replaced by Na, and up to 100 percent of the Ti is replaced by Zr or NaCr. The ceramic composition is especially suitable for optically reflecting films.

REFERENCES:
patent: 4049891 (1977-09-01), Hong et al.
patent: 4105456 (1978-08-01), Murakami et al.
patent: 4217855 (1980-08-01), Takagi
patent: 4306909 (1981-12-01), Oda et al.
patent: 4394280 (1983-07-01), von Alpen et al.
patent: 4448855 (1984-05-01), Senaha et al.
patent: 4495300 (1985-01-01), Sano
patent: 4587172 (1986-05-01), Roy et al.
Clearfield et al., Mat. Res. Bull., vol. 15, No. 11, pp. 1603-1610 (1980).
Hong, H. Y. P., "Materials Research Bulletin" vol. 11(2), pp. 173-182 (1976).
Boilot, J. P. et al., "Materials Research Bulletin" vol. 14(11), pp. 1469-1477 (1979).

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