【摘要】 研究了放电等离子烧结 (SPS)钼的致密化、组织和硬度。与其它烧结方法相比 ,SPS是一种时间短、温度低的先进快速烧结法。利用SPS在比CIP S和热压烧结 (HP)低 180～ 5 0 0℃下进行烧结 ,保温 3min ,得到钼的相对密度是 95 .2 %～ 97.9% ,硬度比其它方法烧结的高出HV2 0～HV75。SPS烧结钼的密度呈现随烧结温度的升高而增加的趋势 ,但是其硬度有所下降。SPS在较低温度下烧结的钼的硬度较高 ,原因是其晶粒较细。SPS烧结钼的断口呈沿晶断裂 ,属于脆性断裂更多还原

【Abstract】 The densification, microstructure and hardness of molybdenum prepared by spark plasma sintering (SPS) were investigated. SPS is an advanced rapid sintering technique with a lower temperature and shorter time, compared with other sintering techniques. The molybdenum sintered by SPS at 180～500?℃ lower than by CIP S and HP and in holding time of 3?min obtained relative density of 95.2%～97.9% and hardness HV20～HV75 higher than that by other sintering techniques. The density of molybdenum sintered by SPS increases and the hardness of molybdenum decreases with the temperature increasing. The molybdenum sintered at lower temperature by SPS having higher hardness is due to fine grain strengthening. The fracture mode of SPS sintered molybdenum belongs to brittle intercrystalline fracture.更多还原