放电等离子烧结温度对超细晶W-40Cu复合材料的影响

Effect of Sparking Plasma Sintering Temperature on the Microstructure and Properties of Ultra-fine Crystalline W-40Cu Composites

采用高能球磨法制备了W-40Cu超细晶复合粉体,继而进行了放电等离子烧结(SPS),获得了致密的超细晶W-40Cu块体复合材料,着重研究了烧结温度对复合材料组织和性能的影响。结果表明,随着烧结温度升高,材料的致密度、硬度和电导率也随之升高;在950℃烧结5min的W-40Cu复合材料,W颗粒尺寸约300～500nm,相对致密度达98%,显微硬度HV为287,电导率为17.9MS/m。

Bulk ultra-fine crystalline W-40Cu composites with compact structure were fabricated by spark plasma sintering（SPS） technique with super microcrystalline W-40Cu powders which were prepared by high energy ball milling technology.The effects of sintering temperature on the microstructure and properties of the composites were investigated.The results,show that with the increase of the sintering temperature from 800 ℃ to 950 ℃,the relative density,micro-hardness,and electrical conductivity of the composites prepared are increased.The composites sintered at 950 ℃ for 5 min make approximately 300～500 nm in W grain size,287HV in micro-hardness,relative density of 98%,and electrical conductivity of 17.9 MS/m.