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<p>Zr-<i>x</i>Nb (<i>x</i> = 1.5, 2.0, 2.5, 3.0&#xa0;wt.%) alloys were selected for thermal treatment at 600&#xa0;℃ in air. The oxidation and weight gain of Zr-<i>x</i>Nb alloy at 600&#xa0;°C were analyzed; the effects of niobium content on phase composition, oxide film thickness, hardness, element distribution and wear resistance were investigated. The results showed that the niobium content significantly affected the formation quality and phase structure of the oxide film, which was mainly composed of ZrO<sub>2</sub> and Nb<sub>2</sub>O<sub>5</sub>. An appropriate amount of Nb can promote the formation of dense ZrO<sub>2</sub> oxide film and inhibit cracking and shedding of the film layer. The Zr-2.5Nb film layer oxidized for 6&#xa0;h had moderate thickness and few micro-cracks. The weight of Zr-3.0Nb after oxidation for 6&#xa0;h increased by 0.007&#xa0;mg/mm<sup>2</sup> and the thickness of the oxide layer increased by 7.475&#xa0;μm compared with that of Zr-1.5Nb alloy. After oxidation, the hardness of the alloy increased significantly, especially the oxidized Zr-2.5Nb, the surface oxide film hardness of Zr-2.5Nb oxidation for 6&#xa0;h increased by 426HV compared with the non-oxidized sample, the friction coefficient was stable at 0.32-0.42, and the wear volume decreased by 0.994&#xa0;mm<sup>3</sup>.</p>

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Influence of Niobium Content on the Thermal Oxidation and Friction Properties of Zirconium-Niobium Alloys

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • YuHua Wu,
  • Tongsheng Deng,
  • ShiLin Xu,
  • FuJun Zhang,
  • Kai Zhao,
  • Liang Qi,
  • Jiqiang Chen,
  • Wenlong Xiao

摘要

Zr-xNb (x = 1.5, 2.0, 2.5, 3.0 wt.%) alloys were selected for thermal treatment at 600 ℃ in air. The oxidation and weight gain of Zr-xNb alloy at 600 °C were analyzed; the effects of niobium content on phase composition, oxide film thickness, hardness, element distribution and wear resistance were investigated. The results showed that the niobium content significantly affected the formation quality and phase structure of the oxide film, which was mainly composed of ZrO2 and Nb2O5. An appropriate amount of Nb can promote the formation of dense ZrO2 oxide film and inhibit cracking and shedding of the film layer. The Zr-2.5Nb film layer oxidized for 6 h had moderate thickness and few micro-cracks. The weight of Zr-3.0Nb after oxidation for 6 h increased by 0.007 mg/mm2 and the thickness of the oxide layer increased by 7.475 μm compared with that of Zr-1.5Nb alloy. After oxidation, the hardness of the alloy increased significantly, especially the oxidized Zr-2.5Nb, the surface oxide film hardness of Zr-2.5Nb oxidation for 6 h increased by 426HV compared with the non-oxidized sample, the friction coefficient was stable at 0.32-0.42, and the wear volume decreased by 0.994 mm3.