Fluidized-Bed Process for Production of Tungsten

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Abstract
A process was developed for the preparation of high-purity tungsten with unusual resistance to grain growth at elevated temperatures. The hydrogen reduction of tungsten hexafluoride in a fluidized bed of tungsten seed particles was used to prepare the granular product. These granules were then consolidated into various shapes by a gas-pressure-bonding technique. Consolidated bars were rolled to premium quality sheet and strip.