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- W146959905 abstract "Pilot-plant-scale equipment has been used in the development of a continuous process for the production of a pure, high-surface-area tungsten trioxide and its subsequent hydrogen reduction to high-surface-area tungsten metal powder. Ammonium paratungstate is utilized in the process as feed material. A controlled particle size precipitation of tungstic acid from the ammonium paratungstate solution with nitric acid in a jet-type precipitator is one of the techniques used in the method. The continuous hydrogen reduction of the tungsten trioxide is accomplished in a rotary kiln. The process produces tungsten trioxide in the surface area range of l0 to 62 square meters per gram (mean particle sizes of 0.084 to 0.0l3 microns), with an average total metallic and silicon impurity content of approximately 30 ppm and a carbon content of about 40 ppm. Hydrogen reduction of the oxide produces tungsten metal powder in the range of 3 to 7 square meters per gram (mean particle sizes of 0.l0 to 0.044 microns), with an average total metallic and silicon impurity of approximately l00 ppm and an average carbon content of about 50 ppm. Other interstitial contaminants were found to vary with the surface area exhibited by the powder. Isostatically pressed pellets of themore » pure, high-surface-area powder showed densities of 93 to 95% of theoretical when sintered in dry hydrogen for three hours at l500 deg C. (auth)« less" @default.
- W146959905 created "2016-06-24" @default.
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- W146959905 date "1961-10-18" @default.
- W146959905 modified "2023-09-24" @default.
- W146959905 title "PREPARATION AND HYDROGEN REDUCTION OF PURE, HIGH-SURFACE-AREA WO$sub 3$" @default.
- W146959905 hasPublicationYear "1961" @default.
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