Verfahren zur Herstellung von Wolframdraht, Wolframdraht und Glühlampe mit einem solchen Wolframdraht

To essentially eliminate aluminum and silicon as contaminants in a doped tungsten wire, the tungsten wire is obtained by mechanical working of reduced tungsten blue oxide which contains as a primary or major constituent a special hexagonal ammonium tungsten bronze of the general formula (NH4)X(NH3)y...

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Bibliographic Details
Main Authors ALTMANN, BERNHARD, GAHN, ALFRED, FAIT, MARTIN, LUNK, HANS-JOACHIM, SALMEN, MICHAEL
Format Patent
LanguageGerman
Published 18.10.2001
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
CASTING
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
ELECTRIC INCANDESCENT LAMPS
ELECTRICITY
FERROUS OR NON-FERROUS ALLOYS
INORGANIC CHEMISTRY
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
METALLURGY
PERFORMING OPERATIONS
POWDER METALLURGY
PRETREATMENT OF RAW MATERIALS
PRODUCTION AND REFINING OF METALS
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
WORKING METALLIC POWDER
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Summary:To essentially eliminate aluminum and silicon as contaminants in a doped tungsten wire, the tungsten wire is obtained by mechanical working of reduced tungsten blue oxide which contains as a primary or major constituent a special hexagonal ammonium tungsten bronze of the general formula (NH4)X(NH3)yWO3. A liquid doping step is carried out by adding a solution containing potassium nitrate, the special doped ammonium tungsten bronze forming preferably more than 70% by weight of the overall tungsten blue oxide. The special hexagonal ammonium tungsten bronze is made by decomposing ammonium paratungstate in an ammonium atmosphere, preferably at a temperature between about 400 DEG and 550 DEG C.
Bibliography:Application Number: DE19961007355