Effect of Additives on Microstructure and Properties of W-Cu Alloys
Using copper powder and tungsten powder as raw materials,W-Cu alloys were prepared by me-chanical alloying and spark plasma sintering.The effects of different sintering temperatures and the addi-tions of Y2O3 and Cr additives on the microstructure and physical and mechanical properties of the alloys were analyzed using SEM,XRD,Vickers hardness tester,electron densitometer,and conductivity tester.The experimental results show that as the sintering temperature increases,the distribution of W and Cu phases becomes more uniform,and the density,hardness,and conductivity of the alloys increase.The W-Cu alloy prepared at a sintering temperature of 1 100℃ exhibits the best comprehensive physical and mechani-cal properties.With the increase in Y2O3 content,the grains of the W-Cu alloys become finer,the hardness increases,while the density and conductivity decrease.In addition,with the increase in Cr content,the con-ductivity of the W-Cu alloys decreases,but the hardness and density increase slightly and then decrease sig-nificantly.The W-Cu-0.5Cr alloy possesses the best comprehensive physical and mechanical properties.Therefore,adding a small amount of additives can effectively improve the microstructure and physical and mechanical properties of the SPS products(W-Cu alloys).
W-Cu alloyspark plasma sinteringsintering temperatureadditiveY2O3Crmicrostructurephysical and mechanical property
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