【摘要】 通过热重分析(TGA)研究TiH2粉末粒度对其脱氢温度及脱氢量的影响,采用热膨胀仪研究粉末粒度对TiH2压坯收缩率的影响,同时利用真空烧结炉研究成形压力和温度对TiH2压坯烧结脱氢的影响。结果表明:TiH2粉末粒度越细,起始脱氢的温度越低;与粒度约为45μm的原料TiH2粉相比,经过球磨的粉末脱氢量减小;球磨30 min后的TiH2粉末压坯,烧结线收缩率和收缩速率都显著增大;原始TiH2粉末压坯和球磨30 min后粉末压坯的最大收缩率分别为5%和9.5%,最大收缩速率分别为2.4×10-4和7.30×10-4μm/℃;成形压力越大,TiH2压坯脱氢峰值温度越高,650℃保温1 h,TiH2压坯失重率达到3.572%(理论含氢量为4.01%)。更多还原

【Abstract】 The effects of TiH2 powder size on dehydrogenation temperature and the amount of dehydrogenation were investigated by TGA.The shrinkage behaviors of compacts with different powder size were analyzed by a Dilatometer.The influences of compacting pressure and temperature on dehydrogenation behavior of TiH2 green compact were conducted in a vacuum furnace.The results show that,the finer the powder size,the lower initial dehydrogenation temperature.The weight loss reduced for ball milling powder and the linear shrinkage and linear shrinkage rate of fine TiH2 powder milled for 30 min were significantly increased,compared with raw TiH2 powder(～ 45 μm).The highest linear shrinkage is 5% for raw TiH2 powder and 9.5% for ball milling 30min and the highest linear shrinkage rate is 2.4×10-4 and 7.30×10-4 μm/℃,respectively.The peak temperature of dehydrogenation of TiH2 green compact with high compacting pressure is relatively higher than that of low compacting pressure green compact.Being dehydrogenated at 650 ℃ for 1 h under high vacuum,the quantum of dehydrogenation reached 3.572%(theoretical hydrogen content 4.01%).更多还原