Abstract The high-temperature tribological properties of plasma-sprayed YSZ coatings are enormously weakened by intrinsic cracks and pores, brittleness and lubrication deficiency. Therefore, we are attempting to employ Ag and Ag2MoO4 nanoparticles together, as high-temperature lubricant additives, to chemically modify YSZ coatings. With aid of vacuum impregnation and hydrothermal reaction, Ag and Ag2MoO4 nanoparticles were first anchored in the defects of YSZ coatings. The two nanoparticles dramatically reduced the coefficients of friction and wear rates of YSZ coatings under ultrahigh peak Hertzian contact stress at 800 °C, endowing YSZ coatings with an extremely long lifetime and bringing negligible wear damage to the friction pair. It is liquid lubrication and the formation of stable tribofilm that jointly contribute to the remarkably-durable lubricating performance.

中文翻译：

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锚定在等离子喷涂 YSZ 涂层中的 Ag 和 Ag2MoO4 纳米颗粒的协同润滑：在 800 °C 下具有卓越的耐用润滑性能

摘要 等离子喷涂YSZ涂层的高温摩擦学性能因内在裂纹和气孔、脆性和润滑不足而极大地减弱。因此，我们正尝试将 Ag 和 Ag2MoO4 纳米颗粒一起用作高温润滑剂添加剂，对 YSZ 涂层进行化学改性。借助真空浸渍和水热反应，Ag 和 Ag2MoO4 纳米粒子首先锚定在 YSZ 涂层的缺陷中。这两种纳米粒子在 800°C 的超高峰值赫兹接触应力下显着降低了 YSZ 涂层的摩擦系数和磨损率，使 YSZ 涂层具有极长的使用寿命，并且对摩擦副的磨损损伤可以忽略不计。