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<p>Self-adaptive conception provides a reference for design of high-temperature self-lubricating material. Herein, temperature-adaptive Ni<sub>3</sub>Al-based self-lubricating alloys were designed and fabricated based on soft lubricating silver and tribo-chemical silver vanadate, and their performance was investigated over a broad range of temperatures. Ni<sub>3</sub>Al-Ag-V alloys exhibit excellent self-lubricating properties and wear resistance over a wide temperature range, especially for the Ni<sub>3</sub>Al-20&#xa0;wt.%Ag-5&#xa0;wt.%V alloy with friction coefficients as low as 0.26 and 0.23 at room temperature and 900&#xa0;°C, respectively, and wear rates as low as 5 × 10<sup>−6</sup> mm<sup>3</sup>/Nm and 4 × 10<sup>−5</sup>&#xa0;mm<sup>3</sup>/Nm in turn. It is proposed for a temperature-adaptive lubrication mechanism, such as tribo-chemistry of silver vanadate, tribo-transfer film, and the synergistic lubrication effect of soft metal Ag at low temperatures and silver vanadate at high temperatures.</p>

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Temperature-Adaptive Self-Lubricating Alloys with Soft Silver and Tribo-Chemical Silver Vanadate

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Min Zheng,
  • Jie Chen,
  • Zongxiao Zhu,
  • Jiao Chen,
  • Jun Cheng,
  • Shengyu Zhu,
  • Jun Yang

摘要

Self-adaptive conception provides a reference for design of high-temperature self-lubricating material. Herein, temperature-adaptive Ni3Al-based self-lubricating alloys were designed and fabricated based on soft lubricating silver and tribo-chemical silver vanadate, and their performance was investigated over a broad range of temperatures. Ni3Al-Ag-V alloys exhibit excellent self-lubricating properties and wear resistance over a wide temperature range, especially for the Ni3Al-20 wt.%Ag-5 wt.%V alloy with friction coefficients as low as 0.26 and 0.23 at room temperature and 900 °C, respectively, and wear rates as low as 5 × 10−6 mm3/Nm and 4 × 10−5 mm3/Nm in turn. It is proposed for a temperature-adaptive lubrication mechanism, such as tribo-chemistry of silver vanadate, tribo-transfer film, and the synergistic lubrication effect of soft metal Ag at low temperatures and silver vanadate at high temperatures.