发明名称 |
Additives for suppressing tungsten leachability |
摘要 |
<p>The leachability of tungsten in an aqueous medium may be suppressed by combining tungsten metal with a metal oxide or metal salt that will form an insoluble tungsten-containing compound when the mixture is brought into contact with an aqueous medium. The additive is preferably present in an amount from about 1 weight percent (wt.%) to about 10 weight percent of the tungsten. Preferred additives are lead oxide and calcium sulfate. The method can be used in processing tungsten powder to pressed powder compacts.</p> |
申请公布号 |
EP1683879(A2) |
申请公布日期 |
2006.07.26 |
申请号 |
EP20060001442 |
申请日期 |
2006.01.24 |
申请人 |
OSRAM SYLVANIA INC. |
发明人 |
LUNK, HANS-JOACHIM;MORGAN, RICKY D.;STEVENS, HENRY J. |
分类号 |
C22B34/36;B22F1/00;B22F1/02;C23F11/00 |
主分类号 |
C22B34/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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