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.

制备了三种Mo-Si-B基合金（Mo-12Si-10B，Mo-12Si-10B-1Zr和Mo-12Si-10B-1Zr-0.3Y（at。％）），以研究Zr的影响，尤其是进一步研究Zr的影响添加Y对1250°C合金的氧化行为。Mo-12Si-10B合金由于形成保护性SiO ₂层而具有良好的抗氧化性。但是，由于ZrO ₂的相变，触发了保护性SiO ₂层的破坏，添加1 at。％Zr（Mo-12Si-10B-1Zr合金）会导致灾难性的氧化行为。进一步添加0.3 at。％的Y（Mo-12Si-10B-1Zr-0.3Y合金）可通过促进形成单晶ZrSiO ₄而不是多晶ZrO ₂来消除Zr合金的这种有害作用。在氧化过程中。此外，在氧化后期（≥20h），在氧化皮表面形成连续致密的Y ₂ Si ₂ O ₇层，进一步提高了抗氧化性。