Method of producing optically transparent yttrium oxide

Details Method of producing optically transparent yttrium oxide Method of producing optically transparent yttrium oxide

1988-11-25

1991-04-02

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501152, 264 12, 264 65, 264 66, 423263, C04B 3550, B29D 1100

Patent

active

050047124

ABSTRACT:
A transparent yttrium oxide ceramic is made by densifying a yttrium oxide power without addition of dopants. The yttrium oxide powder is consolidated into a body of a predetermined shape and sintered to a density such that any remaining porosity is sealed from the surrounding atmosphere. The closed porosity body is then subjected to an elevated pressure and temperature to provide the body with substantially 100% of theoretical density while the body is disposed adjacent an oxygen supplying media. The oxygen supplying media is a ceramic media used to provide an oxygen partial pressure during the densification step ast the elevated pressure and temperature. After this step, a clear transparent body is provided without the need for any further high temperature processing such as a post densification anneal to restore oxygen stoichiometry to the body. The resulting body has substantial transparency over the wavelength range of 0.6 .mu.m to 7 .mu.m.

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patent: 4755492 (1988-07-01), Greskovich et al.
patent: 4761390 (1988-08-01), Hartnett et al.

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