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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Zr含量对Nb-Ti-Si基超高温合金组织及抗氧化性能的影响
DOI: 10.11900/0412.1961.2015.00092, PP. 1049-1058
Keywords: Nb-Ti-Si基超高温合金,相组成,显微组织,高温氧化
Abstract:
采用真空非自耗电弧熔炼法制备了成分为Nb-22Ti-15Si-5Cr-3Hf-3Al-xZr(x=0,0.5,1,2,4和8,原子分数,%)的合金,研究了Zr含量对合金电弧熔炼态组织及高温抗氧化性能的影响.结果表明,6种不同Zr含量的合金均由Nb固溶体和g-(Nb,X)5Si3(X为Ti,Hf,Cr和Zr)组成,添加Zr并未改变合金的相组成,但随着Zr含量增加,合金中初生g-(Nb,X)5Si3的尺寸增大,含量提高.对不同Zr含量合金在1250℃分别氧化1~50h发现,随着Zr含量的增加,合金氧化膜黏附性及致密性均得到显著改善,Zr含量较高的合金(x=4和8)氧化50h后,氧化膜出现明显的分层现象最外层为致密的单相TiO2层,中间层主要由ZrO2,TiNb2O7和TiO2组成,而内层主要由Si的氧化物组成.随着合金中Zr含量增加,氧化膜厚度及单位表面积的氧化增重均显著降低,抗氧化性能得到明显改善.
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