Preparation Of Tungsten Carbide Alloy Powder By High Temperature Mechanochemical Method

WC alloy powder hardness is close to diamond,it has good electrical and thermal conductivity,high temperature tolerance,good corrosion resistance,high melting point,high strength,therefore,it is often used as a high-speed cutting tool,kiln structure material,jet engine parts,resistance heating element,wear resistant parts and aerospace materials,it is a common hard alloy material in life,it has broad application prospects.Conventional WC alloy preparation process requires higher preparation conditions,leading to energy consumption and cost in the entire preparation process,limit industrial large-scale production applications to a certain extent.Preparation of WC alloy powder by high temperature mechanical force chemistry,the feasibility of using this method to prepare WC alloy powder from different raw materials was verified,the effect of adding Ni and Co metal elements on preparation was investigated,and the effects of ball milling temperature,ball milling time,ball-to-batch ratio and ball mill speed on the preparation process were investigated,preliminary determination of the optimal process conditions for the preparation.The phase and morphology of the ball milled product were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),laser particle size analysis and X-ray fluorescence spectrometry(XRF).The research indicates that:WC alloy powder can be successfully prepared by high temperature mechanical force chemistry with different tungsten sources as reactants,during the experiment,compare the effect of adding Ni powder on the experiment,the experiment indicates that the addition of Ni powder can greatly accelerate the reaction and promote the formation of WC alloy powder.The ratio of the tungsten source to the carbon source is 1:1.5,the ball-to-batch ratio is 40:1,the ball mill speed is 40 r/min,and the mixed powder of WC and C can be obtained after ball milling at 800? for 90 h,wherein phase C is an excess of carbon source residue,which can be washed away by water washing to obtain pure phase WC alloy powder.The powder obtained by different milling time by XRD analysis shows that the order of powder phase transformation in this mechanical alloying process is:W,C6H12O6?W,C?W2C?WC.The WC characteristic diffraction peak of the product is sharp,the crystal is good,and there is almost no impurity peak.It can be observed by SEM that the product particle size distribution is uniform and no agglomeration occurs.The particle size of the powder was detected by laser particle size analyzer,the median diameter of tungsten powder was 2.09 ?m,and the median diameter of the product was 4.26 ?m when APT was used as raw material,which reached the micron level and met the industrial production requirements and higher tungsten carbide content in the product.