Compositions: ceramic – Ceramic compositions – Yttrium – lanthanide – actinide – or transactinide containing
Patent
1981-05-05
1983-02-08
Bell, Mark
Compositions: ceramic
Ceramic compositions
Yttrium, lanthanide, actinide, or transactinide containing
220 21R, 313221, 423625, 501153, H01J 1716, C04B 3510, C04B 3550
Patent
active
043730302
ABSTRACT:
A polycrystalline translucent alumina sintered body having high in-line transmission, which is suitable for an envelope for a high pressure vapor discharge lamp, is produced by adding to alumina powder having a purity of more than 99.8% MgO or a compound forming MgO in an amount of 0.01-0.1% by weight calculated as MgO, La.sub.2 O.sub.3 or a compound forming La.sub.2 O.sub.3 in an amount of 0.001-0.05% by weight calculated as La.sub.2 O.sub.3, and Y.sub.2 O.sub.3 or a compound forming Y.sub.2 O.sub.3 in an amount of 0.001-0.5% by weight calculated as Y.sub.2 O.sub.3, thoroughly mixing the resulting mixture, shaping the mixture into a desired form and firing the shaped article under vacuum or either atmosphere of hydrogen gas or dissociated ammonia gas under oxygen concentration of 10.sup.-15 -10.sup.-25 atm.
REFERENCES:
patent: 4182972 (1980-01-01), Kaneno et al.
patent: 4214666 (1980-07-01), Oda et al.
patent: 4222978 (1980-09-01), Oda et al.
Kajihara Takehiro
Kaneno Masayuki
Bell Mark
NGK Insulators Ltd.
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