Low expansion transparent glass ceramics

Details Low expansion transparent glass ceramics Low expansion transparent glass ceramics

2006-07-04

2006-07-04

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

C501S007000, C428S846900

Reexamination Certificate

active

07071132

ABSTRACT:
There are provided low expansion transparent glass-ceramics obtained by heat treating a base glass produced at a relatively low melting temperature of 1530° C. or below. The glass-ceramics have an average linear thermal expansion coefficient within a range from +6×10−7/° C. to +35×10−7/° C., 80% transmittance wavelength (T80) of 700 nm or below internal transmittance of 75% or over at light wavelength of 1550 nm, heat resisting temperature of 800° C. or over and Young's modulus of 90 GPa or over. The glass-ceramics comprise SiO2, Al2O3, MgO, CaO, BaO, ZnO, Li2O, TiO2and ZrO2and contain β-quartz or β-quartz solid solution as a predominant crystal phase.

REFERENCES:
patent: 5968857 (1999-10-01), Pinckney
patent: 5972816 (1999-10-01), Goto
patent: 6344423 (2002-02-01), Goto et al.

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