Oxidation behavior of Zr-Y alloyed Mo-Si-B based alloys

被引：11

作者：

Yang, Tao ^{[1
]}

Guo, Xiping ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2020年 / 88卷

基金：

中国国家自然科学基金;

关键词：

Mo-Si-B alloy; Zr-Y alloying; Oxidation; ZrO2; ZrSiO4; Y2Si2O7; HIGH-TEMPERATURE OXIDATION; MICROSTRUCTURE; MECHANISMS; DUCTILITY; ADDITIONS; POWDER;

D O I：

10.1016/j.ijrmhm.2020.105200

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Three Mo-Si-B based alloys (Mo-12Si-10B, Mo-12Si-10B-1Zr and Mo-12Si-10B-1Zr-0.3Y (at.%)) were fabricated to study the effects of Zr and especially further addition of Y on the oxidation behaviors of alloys at 1250 degrees C. Mo-12Si-10B alloy shows good oxidation resistance due to the formation of a protective SiO2 layer. However, as the result of the phase transformation of ZrO2, triggering the breaking up of the protective SiO2 layer, the addition of 1 at.% Zr (Mo-12Si-10B-1Zr alloy) leads to the catastrophic oxidation behavior. Further addition of 0.3 at.% Y (Mo-12Si-10B-1Zr-0.3Y alloy) eliminates this detrimental effect of Zr alloying by promoting the formation of monomorphic ZrSiO4 instead of polymorphic ZrO2 during oxidation. Besides, at the later oxidation stage (>= 20 h), a continuous and compact Y2Si2O2 layer forms on the scale surface, further improving the oxidation resistance.

引用

页数：10

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