Three-dimensional reticular texture structure composite coating and preparation method thereof

Abstract

The invention provides a three-dimensional reticular texture structure composite coating and a preparation method thereof. The three-dimensional reticular texture structure composite coating is composed of a texture structure composite layer region (1), a transition region (2), and a diffusion effect region (3); an effective metallurgical bonding is formed between the coating and a substrate; fine hard particles in the composite region (1) are uniformly distributed between spherical granular alloys to form a three-dimensional reticular texture; the width of the reticular texture between the particles is 20-30 microns, and a space between the hard particles is about 5-10 microns. The preparation method of the three-dimensional reticular texture structure composite coating comprises the following steps: (1) metal substrate treatment; (2) coating powder mixing; (3) preparation of a prefabricated layer, in which the substrate is coated with a 1-2mm thick nickel-based alloy powder in advance to serve as a transition layer before a composite powder partially added with WC is applied; and (4) sintering of a three-dimensional texture coating: naturally drying the product produced through the step (3) in the shade, and then drying the same again, followed by sintering, increasing the temperature, and preserving heat in a vacuum environment, and then carrying out cooling along with a furnace to 150 DEG C, discharging the product from the furnace, and cooling the product to a room temperature, thereby obtaining the product.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to the preparation technology of a wear-reducing and wear-resistant nickel-based composite coating characterized by a three-dimensional network texture structure. Background technique [0002] Nickel-based alloy coatings have been widely applied and studied because of their good wear and corrosion resistance. The final morphology and structure of the coating have a great influence, which in turn affects the friction and wear properties of the coating. In common friction and wear performance tests of coatings, it can be seen that a large number of large-scale peelings appear on the surface of the sample after the test, and there are a large number of furrows along the friction direction, or a large number of white and bright wear debris attached to the surface, especially at high speeds. Under severe conditions such as high temperature, high load, etc., it shows the characteristics...

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Problems solved by technology

[0007] Through the collation of the previous literature, it is found that the textured structure has excellent performance in the tribological properties of the material, which can reduce the friction coefficient and improve the wear resistance. , complex process, high cost, thin thickness, or low bonding strength with the substrate, etc.

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