Method for preparing Fe-based WC-Ni gradient coating by using plasma cladding method

Abstract

The invention discloses a method for preparing an Fe-based WC-Ni gradient coating by using a plasma cladding method, comprising the steps of: designing the number of layers of the gradient coating and the proportion of ceram A at each layer; supplying the A and metal powder B by a binocular; mixing the powder A and B through a three-way device and then putting the mixture into a coaxial powder feeding cladding gun which is controlled by a numerical control device; controlling the transverse size of the coating by controlling the walking speed, the swinging speed and the swinging amplitude as well as obtaining required coating thickness by controlling the powder feeding amount and the plasma arc power; cleaning the surface after the coating is solidified; and repeating the second to fifth steps to complete the preparation of the coating. In the invention, the used equipment is simple; the investment is low; the length, the width and the thickness of the gradient coating are adjustable; the components in the coating are uniform; the gradient coating can be prepared at local positions of workpieces; and metallurgic combination can be achieved between the coating and matrixes or between coatings with high interface combination strength.

Description

technical field [0001] The invention belongs to the field of gradient functional materials and relates to the preparation of Fe-based WC-Ni gradient functional coatings by adopting a plasma cladding method. Background technique [0002] In industrial production, most of the failures of steel parts start from the surface. People usually use surface technology to improve the surface properties of metal materials, such as: surface wear resistance, corrosion resistance, heat resistance, etc. Cladding ceramic technology can successfully combine the toughness and good manufacturability of metal materials with the excellent wear resistance, corrosion resistance and heat resistance of ceramic materials, thereby significantly improving the wear resistance and corrosion resistance of steel surfaces. , heat resistance, is widely used in molds and structural parts of special working conditions, such as: aircraft turbine engine blades, power plant gas turbine blades, blower blades, auto...

AI Technical Summary

Problems solved by technology

For example, the coatings prepared by CVD, PVD and PCVD are thin, but it is not conducive to hindering the expansion of cracks; the coating prepared by PS method is mechanically interlocked, and the coating is easy to fall off; the equipment of LSC method is expensive, which is not conducive to being widely used; others The method requires complex processes and equipment when preparing gradient functional coatings

At present, there is a lack of methods for preparing gradient functional coatings in local areas of complex workpieces (substrates) with low investment in equipment, not limited by the use of sites

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