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Oxidation behavior of Zr-Y alloyed Mo-Si-B based alloys
International Journal of Refractory Metals & Hard Materials ( IF 2.794 ) Pub Date : 2020-01-13 , DOI: 10.1016/j.ijrmhm.2020.105200
Tao Yang; Xiping Guo

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 °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 Y2Si2O7 layer forms on the scale surface, further improving the oxidation resistance.
更新日期:2020-01-14

 

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