不同B含量Mo-Si-B合金的高溫抗氧化性能

不同B含量Mo-Si-B合金的高溫抗氧化性能High-temperature oxidation resistance of Mo-Si-B alloys with different B content

測試了不同B含量（5%-17%, 原子分數）的Mo-Si-B合金在1000-1300 ℃的抗氧化性能，并對其微觀組織及抗氧化機制進行了分析。結果表明，Mo-Si-B合金的氧化行為受B含量和氧化溫度共同影響，B元素主要通過改善表面玻璃相流動性和調節合金內α-Mo、Mo3Si和Mo5SiB2三相的體積分數和微觀組織來影響氧化膜的形成和生長過程。B含量的增加雖然有助于提升玻璃相在低溫下的流動性而促使表面氧化膜快速成形和均勻覆蓋，但在高溫下氧化膜充足的流動性卻不利于合金抗氧化性能的提升，Mo-Si-B合金的抗氧化性能在低溫時受控于B含量而在高溫時取決于α-Mo相含量。對于B含量較高的細晶結構Mo-12Si-17B合金由于含有更多的Mo5SiB2相和更少的α-Mo相，在1000-1300 ℃整個氧化溫度區間內，表面均能形成一層完整、致密的氧化膜。分析認為，金屬間化合物彌散分布的細晶結構可以確保Mo-Si-B合金表現出優異的抗氧化性能。

The oxidation behaviours of Mo-Si-B alloy with B content in the range of 5 to 17% (atomic percent) were experimentally investigated at temperatures between 1000 and 1300 °C. The microstructures and antioxidant mechanisms were also analyzed. Results showed that the oxidation behaviours were effected by both B content and oxidation temperature, B content majorly adjusted and changed the volume fraction and microstructure of three phases, which could affect the formation and growth processes of oxidation film. The Mo-Si-B alloy with the B content increasing was favourable for quick forming and uniform covering by improving the mobility of the glass, but which decreased the oxidation resistance due to the sufficient liquidity of the oxidation film at high temperature. The oxidation resistance of the Mo-Si-B alloy is controlled by B content at low temperature and α-Mo content at high temperature, respectively. A large quantity of Mo5SiB2 phase and a small quantity of α-Mo phase existed in the high B content of Mo-12Si-17B alloy, which could promote the oxide layer to form rapidly but also cover uniformly under the temperature range of 1000-1300 ℃. The discussion illustrates that the fine-grained microstructure combining with the distributed intermetallics is a specific role to ensure the excellent oxidation resistance of Mo-Si-B alloy.

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