Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1982-02-08
1983-08-02
Parrish, John A.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
264 12, 264 62, 264 65, 264 86, C04B 3564
Patent
active
043965954
ABSTRACT:
The in-line transmission of a translucent polycrystalline alumina arc tube for a high-pressure sodium discharge lamp is improved by as much as 50% by dipping the "green" tubular compact in an aqueous slurry containing finely-divided alumina particles and, after the slurry-dipped compact has been dried, subjecting it to the usual pre-sintering and sintering operations required to convert the compact into a dense ceramic body. The slurry is preferably prepared from the same slurry which contains the blended alumina powder, magnesia and other additives that comprise the raw-mix slurry which is spray-dried to produce the larger size generally spherical particles that are compressed or extruded to form the green compact.
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Heytmeijer Herman R.
Strobel Rudolf F.
North American Philips Electric Corp.
Parrish John A.
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