Method for preparing alloy ceramic composite coating by plasma spray welding and plasma spray welding torch

An alloy ceramic and plasma technology, which is applied in metal material coating process, coating, melting spray plating, etc., can solve the problems of the adverse effect of toughness of the strengthening layer, the burning loss of WC particles, and the decrease in hardness, so as to achieve easy industrialization, Improve overall performance and wide application range
CN106637044BActive Publication Date: 2020-02-04CHENGDU BULEIDE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHENGDU BULEIDE TECH CO LTD
Publication Date
2020-02-04

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Abstract

The invention discloses a production method of a composite coating and particularly discloses a method for preparing an alloy-ceramic composite coating through plasma spray-welding. The specific process comprises steps as follows: firstly, the surface of a matrix, alloy powder and ceramic particles are pretreated; then the surface of the matrix is clad with the alloy powder and the ceramic particles by the aid of a designed plasma spray-welding torch, so that a metal-ceramic composite material strengthened layer is formed; when plasma spray-welding is performed, the alloy powder is directly conveyed into an electric arc of a plasma transferred arc and is quickly molten into the liquid state in the electric arc to fall onto the surface of the matrix to form a molten bath; and the ceramic particles are conveyed to the outsides of plasma nozzles and fall into the molten bath on the outside of an arc column of the plasma transferred arc. With the method, the ceramic particles and the arc column fall into the molten bath formed by the molten alloy powder in the state that a certain distance is kept, so that adverse effects such as oxidation, decarburization and the like caused by the high temperature of the electric arc on the ceramic particles can be effectively avoided.
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Description

technical field

[0001] The invention relates to a method for manufacturing a composite coating, in particular to a method for preparing an alloy-ceramic composite coating by plasma spray welding. In addition, the invention also relates to a plasma spray welding torch. Background technique

[0002] Compared with conventional metal materials, metal-ceramic composite materials reinforced with ceramic particles have better hardness and wear resistance. Due to its high hardness (HV1700), melting point (2870°C) and good wettability, tungsten carbide (WC) is often added to nickel-based, iron-based and cobalt-based alloy substrates to form a metal-ceramic composite strengthening layer , widely used in hydropower, thermal power, steel, mining, metallurgy and oil mining equipment to improve the ability of the working face to resist high temperature impact and abrasive wear. Commonly used preparation methods include sintering and surfacing welding. Compared with sintering process, su...

Claims

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