Purple Tungsten Cycle Redox Prepare Submicron Tungsten Powder

Carbide with high hardness, wear resistance, red hardness and high toughness, is an important tool and structural materials. But it belongs to a brittle material, there is a contradiction between the hardness and strength: the lower the intensity of high hardness; hardness and high strength is low. Conventional WC-based cemented carbide tools and materials can not meet the needs of modern industrial development, which requires the development of a high hardness, high strength and high wear resistance carbide. Carbide grain refinement and development of submicron or micron carbide can solve this problem.

Carbide grain size depends on the size of a WC grain, and difficult to produce sub-micron or micron WC is great, and in turn depends on the size of a WC grain size of tungsten powder particles. It can be seen, tungsten powder fineness and uniformity become prepare submicron or micron carbide key. There are reports of phase relative to a single component of tungsten oxide can be produced submicron or micron W and WC powder. The cyclic redox method for preparing submicron W powder processes. This method compared with the method for preparing submicron W powder at home and abroad are currently having on the process route is simple and easy, easy to control the process parameters, equipment and simple.

Purple tungsten through three successive cycles reduction, reduction process for the area temperature is 640 ℃, the second with a temperature of 760 ℃, three with a temperature of 860 ℃, for 20min when the temperature reaches 860 ℃; twice oxide, process as follows: tungsten powder slowly heating in air to 500 ℃ oxidized, for 10min when the temperature reaches 500 ℃, can be prepared in a particle size distribution between 0.11 and 0.95μm accounted for 93.68%, the specific surface area (BET) of 1.082m2 • g-1 of submicron tungsten powder.

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