Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making articles of indefinite length
Patent
1999-09-07
2000-10-10
Jenkins, Daniel J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making articles of indefinite length
419 28, 419 34, 419 35, 419 38, B22F 100
Patent
active
061298905
ABSTRACT:
It has been discovered that potassium retention in NS tungsten processing may be improved by double doping tungsten blue oxide (TBO) prior to reduction. The novel `double-doping` process consists of dry doping standard singly doped K--Al--Si TBO with potassium nitrate, KNO.sub.3, followed by the standard reduction, acid washing, sintering, rolling and drawing steps. In another aspect, the novel method includes an aqueous extraction of heteropolytungstate anion [SiW.sub.11 O.sub.39 ].sup.8- from a sample of the singly doped tungsten blue oxide to predict potassium retention.
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Lunk Hans-Joachim
Martin, III Harry D.
Patrician Thomas J.
Stevens Henry J.
Clark Robert F.
Jenkins Daniel J.
Osram Sylvania Inc.
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