A review of tungsten powder preparation and its effect on properties of tungsten alloy
Tungsten is widely used to prepare vorious alloy materials because of its high melting point,high hardness,corrosion resistance,and low thermal expansion coefficient.In this paper reviews the preparation methods of tungsten powder are reviewed,such as molten salt electrolysis,sol-gel method,high-energy ball milling,and hydrogen reduction method,focusing on the research status of the most widely used hydrogen reduction method on the uniformity of tungsten powder.It is believed that regulating the partial pressure of water vapor in hydrogen is beneficial for improving the uniformity of tungsten powder,and the treatment processes of tungsten powder such as air grinding and nodulization are helpful to improve the uniformity and dispersion of tungsten powder.Furthermore,the effects of particle size and dispersion of tungsten powder on the properties of a tungsten alloy are introduced.It is considered that the uniformly dispersed tungsten powder enjoys great advantages for the preparation of tungsten alloy with a uniform structure.The review of research on grain refinement as for the related properties between tungsten grains in tungsten powder and tungsten alloys is introduced.The effect of the properties of tungsten powder on the properties of additive tungsten alloy is also briefly introduced.
preparation of tungsten powderhydrogen reductiontungsten alloyuniformitydispersivity
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