Low expansion glass

Details Low expansion glass Low expansion glass

1984-07-27

1987-02-03

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65134, 428428, 430 5, 501 56, 501 57, 501 59, 501 61, 501 62, B32B 1706, C03C 3093, G03F 900

Patent

active

046409009

ABSTRACT:
A low expansion glass comprising, all by weight, from 55 to 65% of SiO.sub.2, from 10 to 20% of Al.sub.2 O.sub.3, from 2 to 10% of B.sub.2 O.sub.3, from 3 to 10% of MgO, from 1 to 8% of CaO, from 2 to 10% of ZnO, from 0 to 4% of R.sub.2 O where R is an alkali metal atom, and from 0 to 4% of ZrO.sub.2.

REFERENCES:
patent: 3485644 (1969-12-01), Shonebarger
patent: 3728646 (1973-04-01), Zijlstra
patent: 4038491 (1977-07-01), Gamble et al.
patent: 4319215 (1982-03-01), Yamazaki et al.
patent: 4391916 (1983-07-01), Nakagawa et al.
patent: 4501819 (1985-02-01), Yatsuda et al.
patent: 4554259 (1985-11-01), Franklin et al.
patent: 4567104 (1986-01-01), Wu
Izumitani, T., et al., "Surface Texture Problems of High Precision Glass Substrates for Photomasks"-Hoya Optics, Menlo Park, Calif. (1976), pp. 1-10.
Ceramic Industry-Jan. 1983, vol. 120(1), "Salt Cake", p. 111.

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