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<p>This study investigated the effect of Al addition of 0, 1, 3, and 5 wt.% on the high-temperature cyclic oxidation behavior of spark plasma sintered MoSi<sub>2</sub> alloys at 1100&#xa0;°C. Moreover, the structure, density, and microhardness of MoSi<sub>2</sub> alloys with and without Al addition, including the presence of Fe oxides after a high-temperature oxidation test, were discussed. The results reveal that MoSi<sub>2</sub>-Al alloys mainly comprise MoSi<sub>2</sub> with minor diffraction peaks of Mo<sub>5</sub>Si<sub>3</sub> and SiO<sub>2</sub>. Al appears to be dissolved into the alloy compacts. As Al content in the alloy increases, the formation of Mo<sub>5</sub>Si<sub>3</sub> tends to decrease, and a new phase of Mo(Si,Al)<sub>2</sub> appears. The relative density and hardness of MoSi<sub>2</sub> are increased—however, the hardness of 5 wt.% Al alloy is lower than 3 wt.% Al. This could be related to the formation of Mo(Si,Al)<sub>2</sub> in the 5 wt.% Al alloy. After exposure for 8 cycles at 1100&#xa0;°C, the MoSi<sub>2</sub> alloy without Al addition suffered a mass loss of about − 6.10 × 10<sup>−7</sup>&#xa0;mg/mm<sup>2</sup>—meanwhile, 3 wt.% Al alloy exhibits a better oxidation resistance than the other composition with a mass gain of about 3.48 × 10<sup>-7</sup>&#xa0;mg/mm<sup>2</sup> due to forming a dense and continuous oxide scale mainly composed of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>.</p>

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Structure, Microhardness, and High-Temperature Oxidation Resistance of MoSi2 Alloys: Effect of Al Addition

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Ni Made Kesuma Astuti Indrianingsih Putri,
  • Andi Suhandi,
  • Bambang Hermanto,
  • Maykel T. E. Manawan,
  • Sovian Aritonang,
  • Toto Sudiro

摘要

This study investigated the effect of Al addition of 0, 1, 3, and 5 wt.% on the high-temperature cyclic oxidation behavior of spark plasma sintered MoSi2 alloys at 1100 °C. Moreover, the structure, density, and microhardness of MoSi2 alloys with and without Al addition, including the presence of Fe oxides after a high-temperature oxidation test, were discussed. The results reveal that MoSi2-Al alloys mainly comprise MoSi2 with minor diffraction peaks of Mo5Si3 and SiO2. Al appears to be dissolved into the alloy compacts. As Al content in the alloy increases, the formation of Mo5Si3 tends to decrease, and a new phase of Mo(Si,Al)2 appears. The relative density and hardness of MoSi2 are increased—however, the hardness of 5 wt.% Al alloy is lower than 3 wt.% Al. This could be related to the formation of Mo(Si,Al)2 in the 5 wt.% Al alloy. After exposure for 8 cycles at 1100 °C, the MoSi2 alloy without Al addition suffered a mass loss of about − 6.10 × 10−7 mg/mm2—meanwhile, 3 wt.% Al alloy exhibits a better oxidation resistance than the other composition with a mass gain of about 3.48 × 10-7 mg/mm2 due to forming a dense and continuous oxide scale mainly composed of SiO2 and Al2O3.