Improvement of Oxidation Resistance of TiAl Intermetallic Compound by Sulfidation Treatment
Improvement of Oxidation Resistance of TiAl Intermetallic Compound by Sulfidation Treatment
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硫化处理提高TiAl金属间化合物的抗氧化性能
DOI：
10.3323/jcorr1991.45.712
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
T. Narita
中科院分区：
文献类型：
--
作者：
T. Yoshioka;T. Narita
在1173 K空气中，对经H2-H2S混合气体预硫化后的TiAl合金进行了抗氧化试验，研究了Ti在1173 K空气中的选择性硫化，在合金表面形成了TiAl 3相，并考察了TiAl 3相向TiAl 2相的转变及其对氧化行为的影响。结果表明，在1173 K下氧化86.4ks后，20 μ m厚的TiAl_（13）层转变为TiAl_（2）层。TiAl 3和TiAl 2层都显示出非常好的长时间抗氧化性，高达810 ks。这两个层显示出形成保护性Al 2 O3氧化皮的再钝化能力。
The oxidation resistance was investigated in air at 1173K for the TiAl alloy, which has been pre-sulfidized at 1173K in a H2-H2S gas mixture to form a TiAl3 layer on the alloy surface due to selective sulfidation of Ti, and changes of the TiAl3 into TiAl2 phase as well as their effects on oxidation behavior were considered. It was found that the pre-formed TiA13 layer with 20 um thickness was changed into a TiAl2 layer after oxidation at 1173K for 86.4 ks. Both the TiAl3 and TiAl2 layers indicated very good oxidation resistance for long time, up to 810 ks. These two layers showed re-passivation capability of forming a protective Al203 scale.