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Oxidation protective silicide coating on Mo-Si-B alloys

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Abstract

A MoSi2 coating was successfully formed on a Mo-9Si-18B alloy, consisting of Mo5SiB2 (T2) and Mo solid solution (Mo ss ) phases, using pack cementation with Si. Isothermal and cyclic oxidation tests of pack-cemented Mo-9Si-18B alloys were performed at 1300 °C and 1500 °C. Steady-state oxidation rates at both temperatures are almost equal to those of pure MoSi2. The MoSi2 layer is completely transformed into Mo5Si3 (T1) containing B after oxidation at 1500 °C for 24 hours. Thermal expansion of the T1 phase is anisotropic, but a [001] texture in the growth direction for the columnar grains in the T1 layer reduces thermal stresses generated around the phases. Evolution of T1 layers during oxidation between 1300 °C and 1500 °C was investigated; their growth rate constants and the interdiffusion coefficient of Mo and Si in the Mo-Si-B system have been evaluated and compared with those in the binary Mo-Si system. Furthermore, we have studied phase transformations in a simpler system MoSi2 vs T2 using MoSi2/T2 diffusion couples. Layers of T1 and MoB + T1 were formed in the diffusion zone during oxidation at temperatures between 1400 °C and 1600 °C. This behavior is different from that of the pack-cemented Mo-9Si-18B alloy. Pack-cemented T2 single crystals show a diffusion structure similar to that of MoSi2/T2 diffusion couples, but the ratio of layer thickness is different. Based on these diffusion results, a method for extending the lifetime of the MoSi2 layer is proposed.

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, Kyoto University, 606-8501, Kyoto, Japan

    Kazuhiro Ito (Associate Professor), Hiroshi Numakura (Associate Professor), Taisuke Hayashi (Student) & Masato Yokobayashi (Student)

  2. the Institute of Mechanical Systems Engineering, National Institute of Advanced Industrial Science and Technology (AIST), 305-8564, Tsukuba, Japan

    Takashi Murakami (Researcher)

Authors
  1. Kazuhiro Ito
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  2. Hiroshi Numakura
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  3. Taisuke Hayashi
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  4. Masato Yokobayashi
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  5. Takashi Murakami
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Additional information

This article is based on a presentation made in the symposium entitled “Beyond Nickel-Base Superalloys,” which took place March 14–18, 2004, at the TMS Spring meeting in Charlotte, NC, under the auspices of the SMD-Corrosion and Environmental Effects Committee, the SMD-High Temperature Alloys Committee, the SMD-Mechanical Behavior of Materials Committee, and the SMD-Refractory Metals Committee.

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Ito, K., Numakura, H., Hayashi, T. et al. Oxidation protective silicide coating on Mo-Si-B alloys. Metall Mater Trans A 36, 627–636 (2005). https://doi.org/10.1007/s11661-005-0178-0

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  • DOI: https://doi.org/10.1007/s11661-005-0178-0

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