Preparation method of composite metal alloy coating layer and spraying equipment

Abstract

The invention discloses a preparation method of a composite metal alloy coating layer and spraying equipment, and belongs to the technical field of surface engineering. The composite metal alloy coating layer comprises a first coating and a second coating which are connected with each other. The preparation method comprises the following three steps: (1) adopting a Cu alloy, an Al alloy or a Zn alloy as thermal spraying raw material powder, and spraying the thermal spraying raw material powder in the molten state onto the surface of a pretreated substrate at a first preset speed so as to formthe first coating; (2) baking stainless steel powder in an oven for 2 hours or longer so as to eliminate magnetism between the stainless steel powder; and (3) adopting the stainless steel powder subjected to magnetism elimination as cold spraying raw material powder, and spraying the cold spraying raw material powder onto the outer surface of the first coating at a second preset speed so as to form the second coating. Consequently, the stainless steel powder can be sprayed onto the substrate through cold and thermal spraying method by utilizing the step (1) to the step (3), and then the surface properties of the substrate can be improved.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a preparation method and spraying equipment of a composite metal alloy coating layer. Background technique [0002] Surface engineering technology is used in the fields of aviation, military industry, electronics, communication, transportation, and mechanical processing, and is specifically suitable for the surface treatment of the outer surface and inner cavity of metal or non-metal parts. Commonly used surface treatment techniques include thermal spraying and cold spraying techniques. [0003] Thermal spraying technology is a kind of heat source that uses gas, liquid fuel or electric arc, plasma arc, laser, etc. to powder or filament metal, alloy, ceramic, oxide, carbide, plastic, nylon and their composite materials, Heating to a molten or semi-molten state, atomizing it through the power of the heat source itself, or adding high-speed airflow, and spraying it on t...

AI Technical Summary

Problems solved by technology

When vacuum coating is used, the coating is easy to fall off due to the poor adhesion of stainless steel powder; during vacuum sputtering, the spraying of stainless steel powder has higher requirements on the target material, and the coating surface is easy to scratch; the waste gas and Wastewater has certain pollution to the environment

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