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

A composite coating, alloy ceramic technology, applied in metal material coating process, coating, melting spray plating and other directions, can solve the problems of adverse effects on toughness of strengthening layer, WC particle burning, hardness decrease, etc., and achieve easy industrialization. The effect of improving the overall performance and lowering the production cost

Active Publication Date: 2017-05-10
CHENGDU BULEIDE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the traditional single-channel powder-feeding plasma spray gun is used to prepare the wear-resisting layer of nickel-based alloy-tungsten carbide composite material, the WC particles are first mixed with the nickel-based alloy powder as the bonding phase in a certain proportion, and transported to the plasma arc at the same time. In the column, due to the high temperature of the arc column (up to 8000-10000°C), the temperature of WC particles rises sharply, and the surface oxidation, decomposition, and decarburization are serious, resulting in burning of WC particles, a significant decrease in hardness, and no wear resistance. , WC particles with small particles are even completely melted in the molten pool, which has an adverse effect on the toughness of the strengthening layer

Method used

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  • Method for preparing alloy-ceramic composite coating through plasma spray-welding and plasma spray-welding torch
  • Method for preparing alloy-ceramic composite coating through plasma spray-welding and plasma spray-welding torch
  • Method for preparing alloy-ceramic composite coating through plasma spray-welding and plasma spray-welding torch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] For the finished blower blade plasma spray welding nickel-based alloy-WC composite wear-resistant layer, the steps are as follows:

[0030] 1) The composition of the nickel-based alloy is: C0.4-0.5%, B0.8-1.4%, Si0.17-0.37%, Cr5.0-6.0%, Fe10.0-15.0, the balance Ni; WC composition is C4 -6%, margin W;

[0031] 2) Put the nickel-based alloy powder and WC in an oven, dry at 120°C for 30 minutes, take it out, cool it to room temperature in the air, and then add the corresponding powder feeder and WC powder feeder;

[0032] 3) Sand blast the surface of the blower blade to remove the oxide layer on the surface;

[0033] 4) The automatic fan blade plasma spray welding equipment is used to prepare the wear-resistant spray welding layer of nickel-based alloy-WC composite material on the surface of the blade. Plasma spray welding process parameters are: working current 100-120A, working voltage 18-20V, ion gas flow 200l / min, nickel-based alloy powder feeding gas 150l / min, WC po...

Embodiment 2

[0036] For the finished mine wear-resistant liner plate plasma spray welding nickel-based alloy-WC composite material wear-resistant layer, the steps are as follows:

[0037] 1) The nickel-based alloy composition used is: Cr10-12%, B1.5-2%, Si3-3.5%, Fe2.5-3%, balance Ni; WC composition is C4-6%, balance W;

[0038] 2) Put the nickel-based alloy powder and WC in an oven, dry at 120°C for 30 minutes, take it out, cool it to room temperature in the air, and then add the corresponding powder feeder and WC powder feeder;

[0039] 3) Polish the surface of the liner to reveal a metallic luster;

[0040] 4) Using automatic flat-panel plasma spray welding equipment, the wear-resistant spray welding layer of nickel-based alloy-WC composite material is prepared on the surface of the lining plate. Plasma spray welding process parameters are: working current 180-185A, working voltage 28-30V, ion gas flow 300l / min, nickel-based alloy powder feeding gas 200l / min, shielding gas flow 300l / mi...

Embodiment 3

[0043] For the finished subway shield cutting tool plasma spray welding nickel-based alloy-WC composite wear-resistant layer, the steps are as follows:

[0044] 1) The composition of nickel-based alloy is: C0.8-1%, Cr18-20%, B3-4%, Si4-5%, Fe5-8%, the balance Ni; WC composition is C4-6%, the balance W ;

[0045] :2) Put the nickel-based alloy powder and WC in an oven, dry at 120°C for 30 minutes, take it out, cool it in the air to room temperature, and then add the corresponding metal powder feeder and WC powder feeder;

[0046] 3) Sand blast the surface of the tool to remove the rust on the surface;

[0047] 4) Using automatic tool plasma spray welding equipment, a nickel-based alloy-WC composite material wear-resistant spray welding layer is prepared on the surface of the tool. Plasma spray welding process parameters are: working current 110-115A, working voltage 24-26V, ion gas flow 200l / min, protective gas flow 200l / min, nickel-based alloy powder feeding gas 150l / min, WC...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/06
Inventor 贾俊
Owner CHENGDU BULEIDE TECH CO LTD
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