Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Optical fiber – waveguide – or preform
Patent
1982-10-19
1985-01-22
Parrish, John A.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Optical fiber, waveguide, or preform
264 65, 264 66, C04B 3510
Patent
active
044951167
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 0.001-0.05% 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: 3026210 (1962-03-01), Coble
patent: 3875277 (1975-04-01), Bratton
patent: 3899560 (1975-08-01), Sellers
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
NGK Insulators Ltd.
Parrish John A.
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