中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心知识库

The chromium oxide coatings are deposited on Ni-based high-temperature alloy substrates through an arc ion plating system and then annealed at 1000 ℃ in air for 2 h. During annealing process, Ti and Cr atoms in the substrate diffuse to coating surface and lead to the formation of a mesh-like heave structure comprised of Cr₂O₃ and Cr₂Ti₇O₁₇ phases. The annealed coating exhibits the excellent self-lubricating behavior with friction coefficients below 03 from 25 to 1000 ℃. Friction coefficients show no evident change even in five thermal cycles, showing a great potential as self-lubricating coating operated in a wide temperature range. While the mesh-like heave structure is damaged by friction, Ti and Cr atoms diffusion could continuously supplement the heave structure at the damaged locations at high temperature, enduing the mesh-like heave structure with the self-healing ability.