Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1996-09-20
1997-10-14
Langel, Wayne
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
C01B 2542
Patent
active
056769172
ABSTRACT:
A fine, largely beta phase calcium pyrophosphate powder for, e.g., a diffuser coating for the interior surface of lamp envelopes. The powder is useful for electrostatic deposition of such coatings under varying conditions of environmental humidity. A process for the synthesis of the calcium pyrophosphate is also disclosed. Dibasic calcium orthophosphate (monetite) is dissolved in a dilute aqueous hydrochloric acid solution and spray-dried to form a calcium phosphate powder of spherically shaped hollow particles. The calcium phosphate powder is fired in air to convert the calcium phosphate powder to a spherical calcium pyrophosphate powder including the beta phase as a major component and the gamma phase as a minor component. For a diffuser coating, the poder is sonicated to fragment a portion of the hollow particles.
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Chenot Charles F.
Gingerich Richard G. W.
Trudeau Leslie F.
Clark Robert F.
Langel Wayne
Osram Sylvania Inc.
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