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<p>Tungsten-rhenium alloys are promising candidates for high-temperature structural applications in advanced nuclear power systems; however, their oxidation behavior and degradation mechanisms across a wide temperature range remain insufficiently understood. In the current study, the high-temperature oxidation behavior of W-26Re alloy was investigated in air at 700, 900, and 1100&#xa0;°C. The evolution of oxide film morphology, phase constitution, and elemental distribution was systematically characterized using SEM and XRD. The results indicate a strong temperature dependence of oxidation behavior. At 700&#xa0;°C, the oxidation rate was relatively slow, resulting in a dense oxide film. At 900&#xa0;°C, the high vapor pressures of Re<sub>2</sub>O<sub>7</sub> and ReO<sub>3</sub> induced delamination of the oxide film, accompanied by the formation of numerous pores and cracks, which in turn accelerated the oxidation kinetics. At 1100&#xa0;°C, severe volatilization of rhenium oxides led to an extensive depletion of surface Re and the formation of a porous WO<sub>3</sub>-dominated oxide film. The intense volatilization of rhenium oxides at elevated temperatures compromises the film's protective capability by inducing severe Re depletion and macroscopic cracking, thereby accelerating the alloy's high-temperature oxidation.</p>

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High-Temperature Oxidation Behaviors of W–Re Alloy for Advanced Nuclear Power Systems

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Jiahui Shen,
  • Zhengang Duan,
  • Qinglong Wen,
  • Luying Li

摘要

Tungsten-rhenium alloys are promising candidates for high-temperature structural applications in advanced nuclear power systems; however, their oxidation behavior and degradation mechanisms across a wide temperature range remain insufficiently understood. In the current study, the high-temperature oxidation behavior of W-26Re alloy was investigated in air at 700, 900, and 1100 °C. The evolution of oxide film morphology, phase constitution, and elemental distribution was systematically characterized using SEM and XRD. The results indicate a strong temperature dependence of oxidation behavior. At 700 °C, the oxidation rate was relatively slow, resulting in a dense oxide film. At 900 °C, the high vapor pressures of Re2O7 and ReO3 induced delamination of the oxide film, accompanied by the formation of numerous pores and cracks, which in turn accelerated the oxidation kinetics. At 1100 °C, severe volatilization of rhenium oxides led to an extensive depletion of surface Re and the formation of a porous WO3-dominated oxide film. The intense volatilization of rhenium oxides at elevated temperatures compromises the film's protective capability by inducing severe Re depletion and macroscopic cracking, thereby accelerating the alloy's high-temperature oxidation.