Experimental analysis demonstrates enhanced oxidation resistance in silicon-doped Co-20Re-25Cr alloys under low oxygen pressure, indicating potential benefits for aerospace superalloys.
The incorporation of low concentrations of silicon has been shown to have a significant effect on the oxidation behaviour of superalloys, but this effect has not been studied at low oxidation pressure. Silicon had a significant effect on the oxidation behavior of superalloys, but its positive role under low oxygen pressure has not been examined in detail. This study investigated the ultra-high temperature oxidation behavior of Co-20Re-25Cr ternary alloys with and without 3.0 at.% Si under 3.0 × 10 −5 Pa O 2 . The results showed that the Co-20Re-25Cr-3Si alloy exhibited enhanced oxidation resistance. This improvement was attributed to silicon, which promoted the rapid formation of a protective Cr 2 O 3 layer within a short period. The specific mechanism by which silicon affected the oxidation process was further analyzed and discussed. These findings were crucial for advancing the application of Co-Re-Cr-based alloys in aerospace.
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向军淮 et al. (2026) studied this question.
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