定向凝固过程中Ti-47Al-2Cr--Nb合金与Y2O3陶瓷的相互作用
收稿日期: 2010-02-26
修回日期: 2010-05-08
网络出版日期: 2010-07-11
INTERACTION BETWEEN Ti-47Al-2Cr-2Nb ALLOY AND Y2O3 CERAMIC DURING DIRECTIONAL SOLIDIFICATION
Received date: 2010-02-26
Revised date: 2010-05-08
Online published: 2010-07-11
本文研究了定向凝固条件下Ti-47Al-2Cr-2Nb合金与Y2O3/Al2O3双层结构陶瓷管内层Y2O3的相互作用. 结果表明, Y2O3层有效地阻隔了化学稳定性较差的Al2O3外层与TiAl合金熔体的接触, 从而避免了Al2O3与TiAl之间的化学反应. 合金铸棒内含有平均体积分数约为0.14%的少量Y2O3夹杂物, 主要是由于在定向凝固实验初期阶段Y2O3陶瓷在受到流动的合金熔体渗透侵蚀后脱落所致, 对持续时间不敏感. 高温下合金熔体促进了Y2O3$陶瓷表层的再烧结并形成了2-10 $\mu$m致密的阻挡层, 从而阻止了合金熔体向Y2O3陶瓷内部的进一步渗透以及内部未完全烧结Y2O3陶瓷颗粒向合金熔体中的继续脱落.
关键词： TiAl合金; Y2O3; 定向凝固; Y2O3/Al2O3双层陶瓷管
张花蕊 , 张虎 , 唐晓霞 , 高明 . 定向凝固过程中Ti-47Al-2Cr--Nb合金与Y2O3陶瓷的相互作用[J]. 金属学报, 2010 , 46(7) : 890 -896 . DOI: 10.3724/SP.J.1037.2010.00099
Interaction between Ti-47Al-2Cr-2Nb alloy and inner layer Y2O3 of Y2O3/Al2O3 double-layer ceramic tube has been investigated during directional solidification. The results show that the Y2O3 layer effectively prevents the chemical reactions between TiAl alloy melt and exterior layer Al2O3 with lower chemical stability by blocking their direct contact. The DS alloy ingot contains Y2O3 inclusions which mainly come from the shedding of Y2O3 from ceramic tube inwall by being penetrated and eroded by fluid alloy melt in the initial phase of the directional solidification test. The average volume fraction of the inclusions is only about 0.14% and is insensitive to time. The re-sintering of the Y2O3 ceramic surface layer occurs and a 2-10 μm dense barrier layer is formed by dint of alloy melt at high temperature. It prevents further pervasion of alloy melt into the Y2O3 ceramic and shedding of imperfectly sintered Y2O3 particles into the alloy melt.
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