Preparation method for high-strength high-hardness synchronous gear ring coating with self-lubricating property

Abstract

The invention belongs to the technical field of surface engineering, and relates to a preparation method for a high-strength high-hardness synchronous gear ring coating with a self-lubricating property, in particular to a preparation method for a CFx-BN-Mo2S / Cr3C2-Mo2C-VC synchronous gear ring coating. According to the preparation method for the high-strength high-hardness synchronous gear ring coating with the self-lubricating property, on the basis of the high strength, the high hardness, the wear resistance, the corrosion resistance and the structure stability of a chromium carbide-molybdenum carbide-vanadium carbide material, carbon monofluoride, boron nitride, molybdenum disulfide and a trace amount of WC-10Co-4Cr are added to serve as reinforcing agents, and the reinforcing agents are sprayed to the surface of a synchronous gear ring through a supersonic-speed flame spraying technology; and compared with a traditional synchronous gear ring, the fatigue resistance, the oxidation resistance, the corrosion resistance and the wear resistance are significantly improved, the coating has the very good structure stability and self-lubricating property, and the service life of the synchronous gear ring is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and relates to a method for preparing a self-lubricating, high-strength, high-hardness synchronous gear ring coating, in particular to a CFx-BN-Mo 2 S / Cr 3 C 2 -Mo 2 The preparation method of C-VC synchronous gear ring coating. Background technique [0002] With the development of the automobile industry, the requirements for important parts of automobiles such as engines and synchronizers are getting higher and higher, not only the performance of the matrix material is required, but also the surface performance of the parts is also higher and higher. Synchronizer, as an important part of the car, the quality of the synchronizer will directly affect the flexibility and stability of the car. The synchronous gear ring is the key part of the synchronizer. In order to improve the surface performance of the synchronous gear ring, thermal spraying is generally used. [0003] The exist...

AI Technical Summary

Problems solved by technology

[0003] The existing synchronous gear ring coatings are mostly molybdenum dioxide and chromium carbide. Molybdenum dioxide and chromium carbide materials have the characteristics of high strength, high hardness, wear resistance, corrosion resistance and structural stability; the spraying method is mainly plasma Spraying method and flame spraying method, the hardness and porosity of the coating using plasma spraying are not up to the required requirements, and the coating is sensitive to oxygen, while the flame spraying method has many influencing factors, such as O 2 -C 2 The proportion of H2, the thickness of the alloy wire and the wire feeding speed will all affect the hardness, bonding strength, tensile strength, shear strength and porosity of the coating.