发明名称 |
Synthesis of beta phase spherical calcium pyrophosphate powder |
摘要 |
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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申请公布号 |
US5676917(A) |
申请公布日期 |
1997.10.14 |
申请号 |
US19960717056 |
申请日期 |
1996.09.20 |
申请人 |
OSRAM SYLVANIA INC. |
发明人 |
TRUDEAU, LESLIE F.;CHENOT, CHARLES F.;GINGERICH, RICHARD G. W. |
分类号 |
C01B25/42;(IPC1-7):C01B25/42 |
主分类号 |
C01B25/42 |
代理机构 |
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主权项 |
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地址 |
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