Abstract
High-temperature self-lubricating materials are an appropriate choice to solve the problem of friction and wear for elevated temperature mechanical systems. In this study, NiCrAlYTa-Ag self-lubricating coatings used in a wide temperature range were prepared by the detonation gun spraying method. According to the findings, NiCrAlYTa-Ag coatings are composed of & gamma;/& gamma;', & beta;-NiAl and Ag phases. The hardness and bonding strength of the coating decrease with the addition of Ag, and the coating with 20 % Ag has a high bonding strength of 43 MPa and a hardness of 303 Hv. The coating exhibited a friction coefficient of 0.35-0.47 and a wear rate of 4 x 10- 5-6 x 10-5 mm3/N m From room temperature to 900 degrees C. At low temperatures, lubrication behavior was mainly attributed to the formation of Ag films. Excitingly, the AgTaO3 with good lubrication performance was created at high temperatures by a tribo-chemical reaction, which plays a synergistic lubrication role with Ta2O5 , NiO, and Cr2O3.

Keywords Plus：OXIDATION BEHAVIORCOMPOSITE COATINGSWEAR BEHAVIORPLASMAHVOFMICROSTRUCTUREWELL

Published in TRIBOLOGY INTERNATIONAL，Volume186；10.1016/j.triboint.2023.108662，AUG 2023