Study on the Additive-Free Preparation Process of Ultra-Coarse Grained Tungsten Carbide AITranslate

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Chinese Library Classification Number:TG135.5[一般工业技术—材料科学与工程]

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Ultra-coarse grained tungsten powder was prepared by high-temperature hydrogen reduction without additives,and the reduction process and the quality of tungsten powder were analyzed to discuss the influence of process conditions on the quality of tungsten powder.The tungsten powder and carbon black were uniformly mixed,pressed and then carbonized at 2100℃and 2300℃,respectively.The microstructure of tungsten carbide obtained at different temperatures was compared.The results show that the tungsten powder with an average particle size of more than 30μm,uniform particle size and low agglomeration could be produced under the conditions of above 1300℃and high water vapor partial pressure.Carbonization at a relatively high temperature could produce ultra-coarse grained tungsten carbide powder with single composition,good wear resistance and few defects.The cemented carbide prepared with the tungsten carbide obtained at 2300℃has an average grain size of 8.1μm,and it has higher flexural strength and impact wear resistance than the cemented carbide prepared with the tungsten carbide obtained at 2100℃.