Chemically polished polycrystalline alumina material

Details Chemically polished polycrystalline alumina material Chemically polished polycrystalline alumina material

1975-06-25

1978-03-14

McCamish, Marion E.

Stock material or miscellaneous articles

Surface property or characteristic of web, sheet or block

428410, B32B 1700

Patent

active

040791670

ABSTRACT:
Increased optical transmission is provided for a body of light transmissive polycrystalline alumina body treated at elevated temperatures with a molten flux composition. A tube of the flux polished material which can be used as the light transmissive envelope for high intensity discharge lamps especially sodium vapor lamps, improves light output from the lamp as the result of increased in-line transmission for the treated envelope member. A method of chemically polishing polycrystalline alumina material in this manner is also disclosed.

REFERENCES:
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patent: 2510219 (1950-06-01), Graham
patent: 3026177 (1962-03-01), Pierre et al.
patent: 3026210 (1962-03-01), Coble
patent: 3042566 (1962-07-01), Hardy
patent: 3311482 (1967-03-01), Klingler et al.
patent: 3619309 (1971-11-01), Faktor et al.
patent: 3808065 (1974-04-01), Robinson et al.
patent: 3899560 (1975-08-01), Sellers et al.

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