大尺寸BaZrO3坩埚的制备及其在TiNi形状记忆合金熔炼中的应用  

Preparation of Large Size BaZrO_3 Crucible and its Application to the Melting of TiNi Shape Memory Alloy

作　　者：邢方圆[1] 陈光耀[1] 朱凯亮[1] 吴广新[1] 鲁雄刚[1] 李重河[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《太原理工大学学报》2014年第2期172-175,共4页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(51074105,51225401,51374142);钢铁冶金新技术国家重点实验室开放课题资助项目(KF12-05)

摘　　要：将经过造粒处理，粒径为0～3mm的BaZrO3粉体在180MPa压力下，冷等静压成型，在1720℃高温烧结6h，制备成大尺寸坩埚。在室温和1000℃对坩埚进行热循环实验测试其抗热震性。此坩埚用于TiNi形状记忆合金的真空感应熔炼，熔炼温度为1600℃，熔炼时间20min。用X射线荧光光谱仪及X射线衍射仪分别测定了造粒后粉体及烧结后坩埚的化学成分和物相；用扫描电子显微镜观察了熔炼前后坩埚的显微形貌；用氮氧化物分析仪分析了熔炼铸锭的氧含量并用ICP光谱仪分析Ba、Zr含量。结果表明，1720℃高温烧结的坩埚显微组织晶粒大小均匀，长大不明显；在热循环13次后坩埚表面有局部微裂纹的产生和显微剥落，13～50次之间裂纹扩展缓慢，50次之后没有宏观上的大损伤；钛合金铸锭中O，Ba，Zr压平均含量分别为780，370，15mg／kg。The large size crucible was made by first getting into shape the granulated BaZrO3 powder,which was made of 0-3 mm-long granules, through the 180MPa cold isostatic pressing, and then sintering at the temperature of 1720 ℃ for 6h. To test its thermal shock resistance, we performed the thermal shock test between room temperature and 1000℃. The crucible was put in a vacuum induction furnace for smelting the Ti-Ni memory alloy at 1 600℃ for 20 minutes. The X-ray fluorescence spectrometer and X-ray diffractometer were used to analyze the chemical composition and phase of the granulated powder and the sintered crucible. The scanning electron microscope was used to observe the microscopic morphology of the crucible before and after smelting. The nitrogen-oxide analyzer was used to analyze the oxygen content, and the inductively coupled plasma spectrometer to analyze the content of zirconium and barium. The result shows that the microstructure of the crucible had uniform grain size after sintering at 1720℃, and were produced after th 50th time and there we contents of oxygen, ba mg/kg. the g ermal re n.o rlum rain growth was not obvious. Micro cracks and microscopic peeling cycling for 13 times, the cracks spread slowly between the 13th and macro-damages after 50th time. In TiNiCu Ingot casting, the average and zirconium were respectively 780 （parts per million）, 370, and 15mg/kg.

关 键 词：造粒 大尺寸坩埚 BaZrO3 钛合金 熔炼 

分 类 号：TQ17[化学工程—硅酸盐工业]