High-temperature low-friction hard nano multi-layer VAlCN/VN-Ag coating as well as preparation method and application thereof

Abstract

The invention discloses a high-temperature low-friction hard nano multi-layer VAlCN / VN-Ag coating as well as a preparation method and application thereof. The coating is mainly formed by alternately stacking a plurality of VAlCN barrier layers and a plurality of VN-Ag composite layers. The preparation method of the coating comprises the steps that the VAlCN barrier layers and the VN-Ag composite layers are alternately deposited on the surface of an activated base body through a multi-arc ion plating technology, the VN-Ag composite layer can guarantee the medium-high-temperature low-friction performance of the coating, the VAlCN barrier layer can guarantee the high hardness of the coating, and meanwhile, the VAlCN barrier layer can also be used as a diffusion impervious layer to inhibit rapid loss and oxidation of Ag in the VN-Ag layer. The coating provided by the invention has excellent tribological properties in a temperature range of 25 DEG C to 600 DEG C, the design of the VAlCN barrier layer and the nano multilayer structure ensures that the coating still has low friction properties after undergoing multilayer high-temperature friction; and the coating can be used for high-temperature running parts in the fields of aviation, spaceflight, energy, automobiles, metallurgy, chemical engineering, material processing and the like, and plays a role in high-temperature surface antifriction protection.

Description

technical field [0001] The invention relates to a low-friction hard coating, in particular to a high-temperature, low-friction hard nano-multilayer VAlCN / VN-Ag coating and its preparation method and application, belonging to the field of surface engineering protection. Background technique [0002] In high-tech industries such as aviation and aerospace, as well as traditional industries such as energy, automobiles, metallurgy, chemicals, and material processing, the problem of wear and failure of mechanical equipment and its components working in high-temperature environments has become more and more prominent. For example, in the thrust bearing of a gas turbine, if the temperature is too high, the bearing bush will wear faster, causing secondary damage. Protecting key friction components is the best way to improve the service life, stability and reliability of mechanical equipment and its components effective method. At present, high-temperature self-lubricating materials ...

AI Technical Summary

Problems solved by technology

At present, high-temperature self-lubricating materials are the first choice to solve high-temperature friction and wear problems. For example, NASA uses silver / eutectic fluoride as a compound lubricant for plasma spraying Ni-Cr-based PS series coatings with a lubricating performance of 800 ° C (for example US8753417B , US5866518B), but this type of metal-based coating has poor compactness, uniformity and roughness, and insufficient wear resistance

[0003] In recent years, many researchers have carried out the development of high-temperature and low-friction protective coatings for silver composite ceramics prepared by physical vapor deposition (PVD), including CrN / Ag and MoN / Ag coatings that can work up to 700 °C. The binary nitride ceramic coating has high hardness and can pass through the oxide lubricating phase formed at high temperature and the double metal oxide AgMe x o y Good tribological properties are achieved, but this type of silver composite binary nitride coating will lose its effective anti-friction effect due to excessive silver diffusion loss after a temperature cycle, and there are problems of insufficient high-temperature anti-wear and oxidation resistance

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