Gas-tight sintered translucent aluminum oxide and method

Details Gas-tight sintered translucent aluminum oxide and method Gas-tight sintered translucent aluminum oxide and method

1986-09-04

1987-10-13

Garvin, Patrick P.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 211, 423115, 423263, 423266, 423275, 501152, 501153, C01F 702

Patent

active

046997741

ABSTRACT:
The invention relates to gas-tight sintered translucent aluminum oxide having a density of at least 99.5%, which contains at most 1000 ppm by weight of MgO. According to the invention, the aluminum oxide also has a content of Er.sub.2 O.sub.3 lying between 20 ppm by weight and 200 ppm by weight. The material thus obtained has a great mechanical strength, a high resistance to attack by sodium and a satisfactory translucence. Thus, the material is very suitable for use as wall material for the discharge vessels of high-pressure discharge lamps.

REFERENCES:
patent: 3834915 (1974-09-01), Cleveland et al.
patent: 3905845 (1975-09-01), Kobayashi et al.
patent: 4214666 (1980-07-01), Oda et al.
patent: 4222978 (1980-09-01), Oda et al.
Yogyo-Kyokai-Shi 87, No. 12, 1979, pp. 633-641.
Yogyo-Kyokai-Shi 88, No. 11, 1980, pp. 660-673.
Yogyo-Kyokai-Shi 88, No. 9, 1980, pp. 531-538.

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