The oxidation-resistant Mo30Si60B10 coating for protection of the T2 phase-based molybdenum alloy

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS Open Ceramics Pub Date : 2024-09-10 DOI:10.1016/j.oceram.2024.100671

A.D. Chertova , A. Yu. Potanin , P. Feng , X. Ren , E.A. Levashov , Ph. V. Kiryukhantsev-Korneev

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Abstract

This study focuses on fabrication of a Mo₃₀Si₆₀B₁₀ coating with elevated silicon content, which enhances working properties of Mo-alloy based on the Т₂ phase (t-Mo₅SiB₂). The Mo₃₀Si₆₀B₁₀ coating has a columnar structure. The alloy is characterized by hardness of 17 GPa; Young's modulus of 304 GPa, and elastic recovery of 29 %. Deposition of the coating increased hardness by 40 %; the Young's modulus, by 18 %; and elastic recovery, by 25 %. Oxidation tests at 1200 °C demonstrated that the specific mass loss of the alloy with Mo₃₀Si₆₀B₁₀ coating was 1.5-fold lower than that of the uncoated alloy. An 18 μm thick oxide layer based on a-SiВO and containing MoO₂ particles was formed on the alloy surface. The coating contributes to a ∼14-fold reduction of oxide layer thick. The increase in oxidation resistance of alloy after coating deposition is related to sealing of substrate defects and formation of an a-SiВO layer with elevated silicon content.

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用于保护 T2 相钼合金的抗氧化 Mo30Si60B10 涂层

本研究的重点是制作硅含量较高的 Mo30Si60B10 涂层，以提高基于Т2 相的钼合金（t-Mo5SiB2）的工作性能。Mo30Si60B10 涂层具有柱状结构。该合金的硬度为 17 GPa，杨氏模量为 304 GPa，弹性恢复率为 29%。涂层的沉积使硬度提高了 40%，杨氏模量提高了 18%，弹性恢复提高了 25%。1200 °C 下的氧化测试表明，带有 Mo30Si60B10 涂层的合金的比质量损失比没有涂层的合金低 1.5 倍。合金表面形成了 18 μm 厚的氧化层，该氧化层以 a-SiВO 为基础，并含有 MoO2 颗粒。该涂层使氧化层厚度减少了 14 倍。涂层沉积后合金抗氧化性的提高与基底缺陷的密封和硅含量增加的 a-SiВO 层的形成有关。

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