Preparation method of compound wear-resistant coating on surface of beryllium-copper alloy

Abstract

The invention discloses a preparation method for a compound wear-resistant coating on the surface of a beryllium-copper alloy. The preparation method comprises the following steps: by adopting a double-layered glow plasma diffusion metallizing technology, preparing a diffusion coating layer on the surface of a beryllium-copper workpiece by taking a target material manufactured by any one wire of W, Mo and Nb or a W-Mo alloy, a Mo-Nb alloy, a W-Nb alloy and a W-Mo-Nb alloy and a beryllium-copper alloy panel as a source electrode, wherein before preparation, diamond particles subjected to Cu surface metallized treatment are uniformly sprayed to the surface of the beryllium-copper workpiece, so that the diamond particles are dispersively distributed; in the preparation process of the diffusion coating layer, uniformly spraying the diamond particles subjected to Cu surface metallized treatment to the surface of the workpiece once if the thickness of the coating is increased by 2-5[mu]m; after preparation of the diffusion coating layer is finished, introducing hydrogen for quick cooling; and then polishing the surface of the coating, and exposing the surfaces of the diamond particles. The coating prepared by the method has high electric conductivity, heat conductivity and wear resistance, the bonding strength of the coating with a matrix is high, and the preparation technology is simple in process.

Description

technical field [0001] The invention relates to a method for preparing a composite wear-resistant layer on the surface of a beryllium-copper alloy, which belongs to the technical field of surface modification of metal materials. Background technique [0002] Beryllium copper (QBe1.9) alloy is widely used in many fields such as electronic appliances, aerospace, petrochemical industry, etc. due to its good electrical conductivity, thermal conductivity, and high elastic limit, and has become an indispensable part of national economic construction. important industrial materials. However, QBe1.9 alloy has low hardness and poor wear resistance. Therefore, when it is applied to frictional environments such as gears and test probes, it often causes severe wear due to its low hardness. [0003] Due to the limitations of QBe1.9 alloy composition, structure and other characteristics, the method of heat treatment can only increase the hardness of beryllium copper alloy to a limited ex...

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Problems solved by technology

However, the QBe1.9 alloy has low hardness and poor wear resistance. Therefore, when it is applied to frictional environments such as gears and test probes, it often causes serious wear due to its low hardness.

[0003] Due to the limitation of QBe1.9 alloy composition, structure and other characteristics, the method of heat treatment can increase the hardness of beryllium copper alloy to a limited extent, so the improvement effect on wear resistance is not obvious

Compared with QBe1.9, the commonly used metal or non-metal carbide, nitride and boride wear-resistant coatings have significantly higher resistivity and lower thermal conductivity. At the same time, due to the difference in expansion coefficient, the coating and the substrate It is often peeled off during use due to insufficient bonding strength

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