钛合金熔炼用AZrO_3(A=Ba,Sr,Ca)坩埚的制备及其使用性能研究

Preparation and Application Performance of AZrO_3( A = Ba,Sr,Ca) Crucibles for Melting Titanium Alloys

综述了3种新型复合氧化物(CaZrO3、SrZrO3和BaZrO3)坩埚的制备工艺,分析了3种坩埚熔炼TiNi合金后的效果和界面反应情况。合金熔体与耐火材料间无元素扩散,3种耐火材料均对合金熔体具有良好的反应惰性。此外,通过对比3种耐火材料坩埚与熔体间的界面反应层厚度,发现BaZrO3对TiNi合金熔体具有最高的化学稳定性。进一步使用BaZrO3制备成工业用25kg级坩埚并熔炼TiNi、TiFe、TiAl铸锭,发现铸锭杂质含量较低,说明BaZrO3是一种极具潜力的钛合金熔炼用新型耐火材料。

The preparation technologies of three new type composite oxides（CaZrO3, SrZrO3, BaZrO3）crucibles were summarized, three crucibles were introduced to melt TiNi alloys, and the interracial reaction between the alloy and the refractory were studied. Research shows that there is no element diffusion between melts and refractory, which indicates that three refractory materials exhibit good react resistance with the melts of titanium alloys. In addition, the thickness of interfacial reaction layers between crucible and melts was compared, it can be concluded that BaZrO3 performs the best chemical stability with TiNi alloy. Furthermore, the 25 kg BaZrO3 crucible was made and applied to melt ingots of TiNi, TiFe and TiA1, the result shows that the melts have a low content of impurity elements. This demonstrates that BaZrO3 is a new promising candidate of refractories for melting titanium alloys.