A high heat-resistant composite multilayer coating and its preparation method

By preparing a multi-layered coating of Cr1-XAlXN/nc-CrAlN-a-CNX on the surface of piston rings, the problems of heat resistance and wear of piston rings at high temperatures were solved, achieving good lubrication and wear resistance at high temperatures and extending the service life of piston rings.

CN119932470BActive Publication Date: 2025-10-28HEFEI UNIV OF TECH +1
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Patent Information

Application Number
CN202411884814.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-10-28
Estimated Expiration
2044-12-20

AI Technical Summary

Technical Problem

In existing technologies, piston rings have poor heat resistance under high temperature and high speed conditions, leading to wear failure and scrap. Furthermore, the nano-multilayer carbon-nitrogen-based coatings lack sufficient thermal stability and self-lubricating properties in high-temperature regions, limiting their application range.

Method used

A multi-layered coating structure of Cr1-XAlXN/nc-CrAlN-a-CNX is adopted. By depositing a Cr bonding layer, a multi-layer transition layer and a functional layer on a cemented carbide substrate through a cross-depleted graphite target and a CrAl composite target, the composition and structural design are optimized to improve the bonding strength and wear resistance.

Benefits of technology

It significantly improves the high-temperature oxidation resistance and tribological wear resistance of the coating, enhances the adhesion between the substrate and the coating, extends the service life of piston rings, and reduces the coefficient of friction, thus meeting the wear resistance requirements in high-temperature environments.

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Abstract

This invention provides a high heat-resistant composite multilayer coating and its preparation method, specifically relating to the field of surface coating technology. The invention discloses a high heat-resistant composite multilayer coating comprising a Cr bonding layer, a Cr1-XAlXN / nc-CrAlN-a-CNX multilayer transition layer 3, and an nc-CrAlN-a-CNX functional layer sequentially coated on a cemented carbide substrate. The Cr1-XAlXN / nc-CrAlN-a-CNX multilayer transition layer and the nc-CrAlN-a-CNX functional layer proposed in this invention not only effectively bond Cr... 1‑X Al X N and CN X The enhanced properties and the composite multilayer structure endow it with excellent wear resistance, thereby achieving good lubrication and wear resistance in high-temperature environments. It significantly expands the high heat resistance of the amorphous carbon-nitrogen layer. At the same time, the transition of CrAl and C content in the composition and the construction method of multilayer support layer effectively improve the film-substrate bonding force between the substrate and the coating, enhance the toughness and load-bearing capacity of the top coating, alleviate the internal stress of the functional layer amorphous carbon layer, and significantly reduce the friction coefficient and wear rate of the amorphous carbon-based solid lubricating coating, thereby greatly improving the overall wear performance.
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