摘要
使用传统固相合成的Y_2O_3掺杂与未掺杂的BaZrO_3粉料,运用冷等静压和固相烧结技术,制备BaZrO_3和Y掺杂的BaZrO_3坩埚,并用其熔炼富钛合金(Ti_2Ni,含钛量63%,质量分数)。研究Y_2O_3掺杂对Ba Zr O3坩埚侵蚀层及组织形貌的变化,合金熔体受耐火材料元素污染量的变化以及Y_2O_3掺杂BaZrO_3坩埚抵抗钛熔体的侵蚀性。结果表明:1500℃时,Ti_2Ni熔体对掺杂Y_2O_3的BaZrO_3坩埚侵蚀层厚(1700mm),小于未掺杂的BaZrO_3侵蚀层厚度(2000mm);Y掺杂BaZrO_3坩埚内壁晶粒相对完整,仅部分晶界受熔体侵蚀而模糊,未掺杂的BaZrO_3坩埚晶粒受钛熔体侵蚀及冲刷,出现层片状组织,且内壁结构疏松;随着保温时间从5 min增至15 min时,Y掺杂BaZrO_3坩埚熔炼后Ti_2Ni合金中的O和Zr元素均达到平衡;而未掺杂的Ba Zr O3熔炼后Ti_2Ni中O和Zr含量随保温时间增加而增加。热力学计算也支持上述结论,说明耐火材料在Ti_2Ni熔体中的溶解的进行表明促进BaZrO_3坩埚-合金界面反应,Y_2O_3掺杂能改善BaZrO_3稳定性,增强抗钛熔体的侵蚀性,降低其在钛合金中的溶解。
The crucibles prepared by Y-doped BaZrO3 and undoped BaZrO3 powders were synthesized by a traditional solid-state and cold isostatic pressing method, and then used the two crucibles melted titanium rich alloys(Ti2Ni, 63%Ti, mass fraction). The effect of Ti2Ni melt on the erosion changes and the microstructures of BaZrO3 and Y-doped BaZrO3 crucibles at different melting times, as well as the contamination of the melt by the refractory, and its erosion resistance of titanium melts were investigated. The results show that the thickness 1700 m of erosion layer of Y-doped BaZrO3 crucible is less than that (2000 m) of BaZrO3 crucible at 1500 ℃. The grains of the Y-doped BaZrO3 are relatively complete, and the part of grain boundaries are not clear because of the melt erosion, while the grains of the un-doped BaZrO3 are eroded by titanium melts, and the lamellar and loose structure occurs. When the holding time increases from 5min to 15 min, the O and Zr elements in the Ti2Ni alloy after Y-doped BaZrO3 are all in equilibrium. After melting of the up-doped BaZrO3 the O and Zr contents increase with the holding time increasing. The thermodynamic calculations support the above conclusions, and which indicates the dissolution of refractory in the Ti2Ni melts is the main reason for the alloy-crucible interaction. The doping Y2O3 into BaZrO3 can improve the stability of BaZrO3, enhance the erosion resistance of titanium melts and reduce its dissolution in titanium alloys.
作者
康菊芸
陈光耀
兰豹豹
李宝同
鲁雄刚
李重河
KANG Ju-yun;CHEN Guang-yao;LAN Bao-bao;LI Bao-tong;LU Xiong-gang;LI Chong-he(State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferro metallurgy,School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;Materials Genome Institute, Shanghai University, Shanghai 201900, China;Shanghai Special Casting Engineering Technology Research Center, Shanghai 201605, China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2019年第4期749-755,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51574164
U1760109)
上海市科委基金资助项目(14JC1491400)
中国博士后基金资助项目(2018M632081)~~
关键词
锆酸钡
氧化钇
掺杂
钛合金
稳定性
抗侵蚀性
barium zirconate
yttrium oxide
dopant
titanium alloy
stability
erosion resistance
作者简介
通信作者:李重河,教授,博士;电话:021-56332934;E-mail:chli@staff.shu.edu.cn.
