(北京工業(yè)大學(xué) 教育部新型功能材料重點(diǎn)實(shí)驗(yàn)室，北京 100022)
摘 要: 研究了放電等離子燒結(jié)(SPS)鉬的致密化、組織和硬度。與其它燒結(jié)方法相比，SPS是一種時(shí)間短、 溫度低的先進(jìn)快速燒結(jié)法。利用SPS在比CIP-S和熱壓燒結(jié)(HP)低180～500℃下進(jìn)行燒結(jié)，保溫3*!min，得到鉬的相對(duì)密度是95.2%～97.9%，硬度比其它方法燒結(jié)的高出HV20～HV75。 SPS燒結(jié)鉬的密度呈現(xiàn)隨燒結(jié)溫度的升高而增加的趨勢(shì)，但是其硬度有所下降。SPS在較低溫度下燒結(jié)的鉬的硬度較高，原因是其晶粒較細(xì)。SPS燒結(jié)鉬的斷口呈沿晶斷裂，屬于脆性斷裂。
關(guān)鍵字: 放電等離子燒結(jié); 鉬; 致密化
molybdenum prepared by
spark plasma sintering
ZHOU Mei-ling, ZUO Tie-yong
（The Key Laboratory of Advanced Functional Materials,
Ministry of Education,Beijing Polytechnic University,
Beijing 100022, P.R.China）
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 3min 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.
Key words: spark sintering plasma; molybdenum; densification
