Light transmitting yttria sintered body and its preparation

Details Light transmitting yttria sintered body and its preparation Light transmitting yttria sintered body and its preparation

1990-03-02

1991-12-24

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 94, 501152, 264 56, 264 65, C04B 3502, C04B 3550, C04B 3551, C04B 3516

Patent

active

050752677

ABSTRACT:
A light transmitting yttria sintered body having good light transmission, can be prepared by a method of preparing a light transmitting yttria sintered body which comprises steps of densifying yttria powder having purity of not lower than 99.9% and a BET specific surface area of not smaller than 10 m.sup.2 /g by a hot press at a temperature of 1300.degree. to 1700.degree. C. under a pressure of 100 to 500 kg/cm.sup.2 in a vacuum circumstance so as to achieve the theoretical density ratio of not lower than 95% and then hot isotropically pressing densified yttria at a temperature of 1400.degree. to 1900.degree. C. under a pressure of not lower than 500 kg/cm.sup.2.

REFERENCES:
patent: 3545987 (1970-12-01), Anderson
patent: 3764643 (1973-10-01), Muta et al.
patent: 3873657 (1975-03-01), Toda et al.
patent: 4115134 (1978-09-01), Rhodes
patent: 4166831 (1979-09-01), Rhodes et al.
patent: 4761390 (1988-08-01), Hartnett et al.

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