Metal powders

Non-spherical nickel powder substantially free from carbon is produced by decomposing nickel carbonyl vapour in the substantial absence of water vapour in the hot free space of a decomposer having nitrided steel inner surfaces. The steel surfaces are preferably nitrided by heating them to a high tem...

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Bibliographic Details
Main Authors WEST DE WITT HENRY, LLEWELYN DAVID MYERS
Format Patent
LanguageEnglish
Published 22.03.1967
Subjects
CASTING
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
WORKING METALLIC POWDER
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Summary:Non-spherical nickel powder substantially free from carbon is produced by decomposing nickel carbonyl vapour in the substantial absence of water vapour in the hot free space of a decomposer having nitrided steel inner surfaces. The steel surfaces are preferably nitrided by heating them to a high temperature (e.g. 500 DEG C.) in the presence of ammonia which may be passed alone into the decomposer or passed with the carbonyl in a previous operation with an optional addition of oxygen. In the latter case the ammonia concentration should not exceed 0.2% by volume in the presence of oxygen since this would cause spherical particles to be produced.
Bibliography:Application Number: GB19650034399