Enhanced oxidation resistance of (Mo95W5)85Ta10(TiZr)5 refractory multi-principal element alloy up to 1300°C

Refractory-metal-based alloys are a potential replacement of current nickel-based superalloys due to their excellent mechanical strength at extremely high temperatures. However, severe oxidation in high-temperature working environment limits application. To address this challenge, two-step coating process (including Mo precoat and Si-B pack cementation) was applied an innovative refractory multi-principal element alloy (RMPEA) (Mo95W5)85Ta10(TiZr)5. The is composed aluminoborosilica glass layer on top RMPEA-Si-B multilayered structure. effectively protects the RMPEA from environments, as demonstrated by phase-stable operation 10–20% higher temperatures over state-of-the-art systems without any forced-cooling system. Following isothermal exposure 1300 °C, weight change coated sample follows paralinear kinetics with minor loss 4.2 mg/cm2 after 50 h. Thermal cycling tests between °C room temperature air resulted total gain only 2.6 450 cycles. shows adherence substrate boride acting barrier that maintains integrity. This Mo-Si-B method can be adapted provide environmental resistance wide range RMPEA.