Preparation method for forming metal coating on surface of ceramic substrate by spraying metal powder

Abstract

The invention discloses a preparation method for spraying metal powder to form a metal coating on the surface of a ceramic substrate. The metal powder is prepared by a gas atomization method, and the screened metal powder is mixed to obtain a mixed metal powder; the surface of the ceramic substrate is roughened and polished. Form a roughened surface and perform ultrasonic cleaning; set the ceramic substrate in a high-temperature space of 1200°C to 2500°C, and perform supersonic spraying of mixed metal powder on the roughened surface of the ceramic substrate to deposit and form a dense metal coating. Layer spraying forms the metal layer of a multilayer superimposed structure. The invention adopts the method of cold spraying and high-temperature space to meet the requirements of forming a shielding metal coating on the ceramic substrate. The coating has no through pores, the deposition structure is stable and the flatness is better, and it has very excellent shielding performance, resistance Corrosion performance, strong characteristics. It can achieve multi-layer deposition, adhesion and superposition, which changes the disadvantage that silver and other metals cannot be attached too thickly, meets the specific shielding performance requirements, and the multi-layer superposition is reliable and stable in structure.

Description

Technical field [0001] The present invention relates to a method of metal coating a metal powder coating on the surface of the ceramic substrate is formed, it belongs to the technical field of metal coating spray forming process. Background technique [0002] Ceramic materials with high hardness, high strength, high toughness, corrosion resistance, wear resistance and low density, low weight, are widely used in industry and military fields, the ceramic substrate and the surface of the metal layer needs to be formed, the conventional ceramic matrix the metal material layer is formed using the bonding method, press method, a film prepared by method, its poor adhesion, scratching and easy to fall off. Chemical method a metal layer structure loose, uneven particle distribution, and the preparation process polluting, requires high temperature baking, and the metal paste mixture slurry will be odor and pollution gas evolution. [0003] Whereas in the prior art technology cold spray, co...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, aiming at the problem that rebound and erosion phenomena more or less exist in the traditional cold spraying process and affect the formation of the metal layer, it is proposed to spray metal powder to form a metal coating on the surface of the ceramic substrate preparation method