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<p>The surfaces of titanium alloy/aluminum alloy friction pair serving in space are often severely worn or even stuck due to the lack of effective lubrication. Therefore, in this work, Sn11Sb6Cu coatings were prepared on Al-6061 under different cold-spraying pressures, and their wear properties in different atmospheric environments were systematically studied. The results show that the variation of cold-spraying pressure has a significant impact on the microstructure and mechanical properties of the coatings. In addition, under high-vacuum conditions, the friction coefficient and wear rate of the coating can be as low as 0.16 and 1.04 × 10<sup>−7</sup> mm<sup>3</sup>/(N·mm), respectively, which are significantly better than those in atmosphere. The relationship between atmosphere and coating wear behavior was reasonably explained, and it was proved through EBSD and finite element analysis that excessive dislocation density and longer high-temperature duration are the driving forces for the uneven and abnormal growth of dynamic recrystallization grains during deposition. These findings offer brand-new insights into the rational preparation of Sn alloy coatings and their service in high vacuum.</p>

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Wear Behavior and Mechanism in Different Atmospheres of Cold-Sprayed Sn11Sb6Cu Coatings

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Lei Zhang,
  • Boya Li,
  • Tianshun Dong,
  • Binguo Fu,
  • Jingkun Li,
  • Guolu Li

摘要

The surfaces of titanium alloy/aluminum alloy friction pair serving in space are often severely worn or even stuck due to the lack of effective lubrication. Therefore, in this work, Sn11Sb6Cu coatings were prepared on Al-6061 under different cold-spraying pressures, and their wear properties in different atmospheric environments were systematically studied. The results show that the variation of cold-spraying pressure has a significant impact on the microstructure and mechanical properties of the coatings. In addition, under high-vacuum conditions, the friction coefficient and wear rate of the coating can be as low as 0.16 and 1.04 × 10−7 mm3/(N·mm), respectively, which are significantly better than those in atmosphere. The relationship between atmosphere and coating wear behavior was reasonably explained, and it was proved through EBSD and finite element analysis that excessive dislocation density and longer high-temperature duration are the driving forces for the uneven and abnormal growth of dynamic recrystallization grains during deposition. These findings offer brand-new insights into the rational preparation of Sn alloy coatings and their service in high vacuum.