One-step production of high-strength titanium alloy by sintering titanium hydride powder from upgraded titania slag  

高钛渣还原的氢化钛合金粉一步烧结制备高强钛合金

作　　者：Zhao-wang DONG Yang XIA Xue-yi GUO Qing-hua TIAN Han-ning LIU Pei-dong LIU Yu-bing CHEN 董朝望;夏阳;郭学益;田庆华;刘汉宁;刘沛东;陈渝冰(中南大学冶金与环境学院,长沙410083;中南大学资源循环研究院,长沙410083)

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]Research Institute of Resource Recycling,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第11期3801-3809,共9页中国有色金属学报（英文版）

基　　金：the National Natural Science Foundation of China(No.52004342);the Innovation-Driven Project of Central South University,China(No.150240015);the Natural Science Fund for Outstanding Young Scholar of Hunan Province,China(No.2021JJ20065).

摘　　要：A direct production method of high-strength titanium alloy from upgraded titania slag(UGS)was developed.First,UGS was reduced into alloy powder with 1.3 wt.%oxygen using magnesium powder.Subsequently,the alloy powder was compacted at 600 MPa to produce a pellet.Lastly,the pellet was sintered to produce titanium alloy.The reduced powder was characterized,and the effect arising from the sintering temperature on the sintered density,compressive strength,microstructure,and hardness of the alloys was studied.The results showed that the density tended to increase with the temperature increasing from 900 to 1200℃,whereas the porosity decreased.A significant sintering densification was achieved at the temperature above 1100℃(98.65%at 1100℃ and 99.41%at 1200℃).At 1100℃,the hardness and compressive strength reached the maximal values of the alloy,HV 655.7 and 1563 MPa,respectively.提出一种直接利用高钛渣制备高强钛合金的方法。先用镁粉还原高钛渣制备氧含量为1.3%(质量分数)的合金粉末,再将合金粉末在600 MPa压力下压制成小圆柱体,最后在氩气下烧结成钛合金产品。对还原粉末进行表征,研究烧结温度对烧结合金的烧后密度、抗压强度、显微组织和硬度的影响。结果表明,随着烧结温度由900℃升高至1200℃,钛合金的密度增加,孔隙率降低,实现较好的烧结致密化(1100℃为98.65%,1200℃为99.41%),在1100℃时硬度达到HV 655.7,压缩强度为1563 MPa。

关 键 词：upgraded titania slag reduction titanium alloy SINTERING 

分 类 号：TF823[冶金工程—有色金属冶金]