CAJ | 학술논문

研究TiH 2粉末的高能行星球磨规律，然后使用制备出的球磨粉末开展压制?真空烧结，评价烧结样品的显微组织特征。结果表明，TiH 2粉末的高能球磨可划分为3个基本阶段：球磨初期粉末粒度迅速细化；球磨中期粉末粒度逐步趋向最小极限尺寸，同时粉末粒径的均匀性和分布集中程度明显改善；在球磨的后期，粉末粒径又会发生粗化现象。因此，TiH2粉末的高能行星球磨存在一组最佳的工艺参数。高能球磨会改变TiH2粉末的脱氢特征温度，且粉体的D 50越小，特征温度下降幅度越大，与原料粉末相比，最大差值达83℃。对烧结样品的显微组织分析显示，通过由球磨TiH 2粉末所获得的烧结钛合金的晶粒度得到了显著地细化；当采用优化的工艺开展球磨TiH 2粉末制备时，通过压制和真空烧结可获得平均晶粒度在5μm以下的超细晶钛。
연구TiH 2분말적고능행성구마규률，연후사용제비출적구마분말개전압제?진공소결，평개소결양품적현미조직특정。결과표명，TiH 2분말적고능구마가화분위3개기본계단：구마초기분말립도신속세화；구마중기분말립도축보추향최소겁한척촌，동시분말립경적균균성화분포집중정도명현개선；재구마적후기，분말립경우회발생조화현상。인차，TiH2분말적고능행성구마존재일조최가적공예삼수。고능구마회개변TiH2분말적탈경특정온도，차분체적D 50월소，특정온도하강폭도월대，여원료분말상비，최대차치체83℃。대소결양품적현미조직분석현시，통과유구마TiH 2분말소획득적소결태합금적정립도득도료현저지세화；당채용우화적공예개전구마TiH 2분말제비시，통과압제화진공소결가획득평균정립도재5μm이하적초세정태。
The planetary milling of TiH2 powders was systematically investigated, and then the sintered samples fabricated by pressing and sintering in vacuum of the milled powders was inspected to reveal the influence of high-energy milling on their microstructures. The results indicate that planetary milling of TiH 2 powders can be divided into three stages. At the initial milling, the size of the powders is rapidly reduced. At the middle milling stage the particle size gradually reaches the minimum, and the scope of size distribution also become more and narrower at the same time as milling goes on. And the size of the powders is raised at the final milling stage. It is also discovered that dehydrogenation temperatures of milled TiH 2 powders decrease in comparison with those of raw powders, and the finer the D 50 , the lower the temperatures. The maximum temperature difference becomes 83℃. Optical analysis shows that the grain size of the sintered titanium samples is obviously fined after milling raw powders. With the optimized milling treatment, the sintered titanium becomes ultrafine grain with size totally less than 5μm by pressing and sintering in vacuum.