INFLUENCE OF ADDITIVES OF OXYGEN-CONTAINING TUNGSTEN COMPOUNDS ON THE PROCESS OF ACTIVATION OF SINTERING OF POROUS TUNGSTEN MATERIALS

Abstract

The principles of the sintering process of "pure", without impurities, porous samples of tungsten materials using the original tungsten powders of different grain sizes, which were previously divided into separate fractions (from 1 to 1000 μm) were studied. Several methods of activating sintering of porous tungsten materials are used: sintering in a closed reaction space and hydrogen, steam-saturated water; introduction of oxygen-containing tungsten compounds (WO₃, H₂WO₄) in a mixture of tungsten powders for sintering. This allowed to obtain porous tungsten materials of different grain sizes at relatively low temperatures (up to 1200 ° C). It was found that the use of additives of WO₃ oxide and tungstic acid H₂WO₄ activates sintering and leads to increased strength and porosity of tungsten materials