The Production Methods of Pressed and Sintered Tungsten Products

The production methods of the pressed and sintered tungsten products are belonging to the field of manufacture of finished metallic powder. The use of high-temperature reduced tungsten powder. At  the room temperature, using a high voltage of 12-27 t / cm with a uniaxial bi  in a rigid mold, the tungsten powder is directly pressed into a density of more than 80 to 93% of the theoretical density products. The tungsten powder is protected by hydrogen for 2-4 hours at a temperature of 1350 ° C to 2000 ° C. And then they are forced cooling or slow cooling. We may get the dense metal products, which the dimensional change is not greater than that of the green sheets of 1/2000 .   The grinding  of the surface uses specialized the vacuum adsorption mold, so that the products  can achieve high accuracy and finish. This method not only can be used for the production of of pure tungsten semiconductor support material  but also can  be used for the production of tungsten composite products.




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