Effect of Fe Addition during Activated Sintering on the Microstructure and Properties of W-Cu Composites AITranslate

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Chinese Library Classification Number:TG146.41[金属学及工艺—金属材料]

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The use of transition metals as sintering aids is an effective method to improve the properties of W-Cu composites.In this study,Fe-coated W powder was synthesized using a liquid-phase addition method combined with hydrogen reduction method,and then W-Cu composites were prepared through planetary ball milling and liquid-phase sintering.The effects of sintering temperature and Fe content on the microstructure and physical and mechanical properties of W-Cu composites were examined,employing techniques such as SEM,EDS,XRD,Vickers hardness tester,electronic densimeter,and conductivity meter.The experimental results indicate that increasing the sintering temperature can improve the homogeneity of the W and Cu phases in the W-Cu composites,leading to a substantial enhancement of material properties.At a sintering temperature of 1400℃,the W-Cu composite exhibits optimal physical and mechanical properties,although this is accompanied by significant Cu volatilization.Under the activated sintering condition of 1300℃,the increase in Fe content leads to the increase in hardness and relative density of the W-Cu composites.When the Fe content is 1.2%,the hardness and relative density reach 239 HV and 99.1%,respectively.Conductivity initially increases but subsequently decreases,reaching an optimal value of 41.4%IACS when the Fe content is 0.6%.Therefore,the addition of Fe facilitates the liquid-phase sintering densification of W-Cu composites,resulting in significant improvements in their microstructure and physical and mechanical properties.However,excessive Fe addition has an adverse impact on conductivity.In practical applications,the Fe content should be controlled at approximately 0.6%.