Wear-resistant coating and method for producing same

By forming a transition layer with a composite crystal structure and a titanium nitride wear-resistant layer on the substrate surface, the problem of easy peeling of TiN coating at high temperature is solved, and stable interfacial bonding and wear resistance at high temperature are achieved, thus extending the service life of parts.

CN121653579BActive Publication Date: 2026-05-29SUZHOU UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUZHOU UNIV
Filing Date
2026-02-06
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing TiN coatings are prone to cracking at high temperatures due to the mismatch in thermal expansion coefficients with the substrate, and their bonding ability is weak after oxidation, causing parts to easily fall off during high-temperature wear, thus affecting their service life.

Method used

By forming a Stellite 6 alloy transition layer composed of equiaxed crystals, columnar crystals and fine equiaxed crystals on the substrate surface, and combining it with a titanium nitride wear-resistant layer formed by chemical vapor deposition, a continuous hardness and elastic modulus gradient is constructed to alleviate interfacial stress concentration. Furthermore, the thickness and bonding strength of the transition layer are improved by multiple plasma arc welding processes.

Benefits of technology

It effectively inhibits the brittle material fragmentation and detachment caused by oxidation of TiN coating at high temperature, improves interfacial bonding ability, extends the service life of wear-resistant coating, and maintains a stable coefficient of friction under high-temperature friction conditions, reducing the risk of wear failure.

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Abstract

The application relates to the field of wear-resistant coatings, in particular to a wear-resistant coating and a preparation method thereof. An oxide layer on the surface of a base is removed to obtain a base surface. A transition layer is formed on the surface of the base surface by multiple plasma arc surfacing with Stellite 6 welding material. The surface of the transition layer is ground and cleaned to form a bonding surface. A wear-resistant layer is formed on the surface of the bonding surface by chemical vapor deposition, and the composition of the wear-resistant layer is titanium nitride. The transition layer connects the wear-resistant layer and the base, so that interface shear stress generated in a high-temperature friction process is gradually released in the thickness direction of the transition layer, thereby reducing the risk of fragmentation and falling of the wear-resistant layer. The transition layer is formed by multiple plasma arc surfacing, which helps the transition layer to have higher toughness and impact resistance, improves the bonding force between the transition layer and the wear-resistant layer, and helps to prolong the service life of the whole wear-resistant coating.
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