Electric lamp and discharge devices – With gas or vapor – Envelope composition
Patent
1984-10-31
1986-12-30
Bell, Mark L.
Electric lamp and discharge devices
With gas or vapor
Envelope composition
313634, 501153, C04B 3510, H01J 6130
Patent
active
046331379
ABSTRACT:
Increased optical transmission is provided for a body of optically transparent polycrystalline alumina by coating at least one major surface of said alumina body with a solid glaze coating and subsequently melting said coating at elevated temperatures to dissolve the surface alumina grains in physical content therewith to provide a smoother surface when the coating residue has been removed. More particularly, a solid glaze coating is first deposited on said major surface of the alumina body and the coated alumina body thereafter heated to sufficiently elevated temperatures for the glaze liquification whereupon surface alumina grains in physical contact therewith are dissolved in a manner which reduces the high spots on the individual surface alumina grains without materially introducing low spots at the grain boundaries and wherein the individual alumina surface grains have been preferentially etched in certain of the crystalline axis directions. The present glaze material comprises an alkali metal borate other than lithium borate having an alkali metal oxide to boron oxide weight ratio in the range from about 1:2 up to 1:4 and which is deposited on the major surface of said alumina body as a liquid suspension.
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McVey Charles I.
Scott Curtis E.
Bell Mark L.
General Electric Company
Jacob Fred
McDevitt J. F.
Schlamp Philip L.
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