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Method for preparing WC/graphite composite coating on surface of titanium alloy

A composite coating and titanium alloy technology, which is applied in the coating process and coating of metal materials, can solve the problems of preparing graphite coating and achieve the effects of simple preparation process, improved friction performance and surface hardness

Active Publication Date: 2016-03-09
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a WC / graphite composite coating on the surface of a titanium alloy for the above-mentioned deficiencies in the prior art. The method uses the heat generated by the laser cladding process to make the titanium alloy substrate The diamond in the surface preset layer undergoes allotropic transformation to generate graphite, which overcomes the defect that the graphite coating cannot be prepared by laser technology in the prior art, and prepares a WC / graphite composite coating on the surface of the titanium alloy, which can improve the surface of the titanium alloy. Wear resistance while reducing its coefficient of friction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] Step 1. Carry out surface pretreatment to the titanium alloy substrate to remove the surface oxide film; the specific process of the surface pretreatment is preferably: firstly use a conventional metal cleaning agent to clean and degrease the surface of the titanium alloy substrate, and remove the titanium alloy after degreasing. The alloy substrate is placed in an acid solution for pickling to remove the surface oxide film, and then cleaned and dried. The acid solution is mixed with hydrofluoric acid solution, nitric acid solution and water at a volume ratio of 3:6:100. The hydrogen The mass concentration of the hydrofluoric acid solution is 40%, the mass concentration of the nitric acid solution is 69%, and the titanium alloy substrate is a TC4 titanium alloy substrate;

[0027] Step 2. Mix tungsten carbide powder and diamond powder evenly to obtain a mixed powder, then add polyvinyl alcohol aqueous solution to th...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] Step 1. Carry out surface pretreatment to the titanium alloy substrate to remove the surface oxide film; the specific process of the surface pretreatment is preferably: firstly use a conventional metal cleaning agent to clean and degrease the surface of the titanium alloy substrate, and remove the titanium alloy after degreasing. The alloy substrate is placed in an acid solution for pickling to remove the surface oxide film, and then cleaned and dried. The acid solution is mixed with hydrofluoric acid solution, nitric acid solution and water at a volume ratio of 5:6:100. The hydrogen The mass concentration of hydrofluoric acid solution is 39%, the mass concentration of described nitric acid solution is 68%, and described titanium alloy base material is TC4 titanium alloy base material;

[0034] Step 2. Mix tungsten carbide powder and diamond powder evenly to obtain a mixed powder, then add polyvinyl alcohol aqueous so...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1. Carry out surface pretreatment to the titanium alloy substrate to remove the surface oxide film; the specific process of the surface pretreatment is preferably: firstly use a conventional metal cleaning agent to clean and degrease the surface of the titanium alloy substrate, and remove the titanium alloy after degreasing. The alloy substrate is placed in an acid solution for pickling to remove the surface oxide film, and then cleaned and dried. The acid solution is mixed with hydrofluoric acid solution, nitric acid solution and water at a volume ratio of 3:7:100. The hydrogen The mass concentration of the hydrofluoric acid solution is 41%, the mass concentration of the nitric acid solution is 68%, and the titanium alloy substrate is a TC6 titanium alloy substrate;

[0041] Step 2. Mix tungsten carbide powder and diamond powder evenly to obtain a mixed powder, then add polyvinyl alcohol aqueous solution to th...

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Abstract

The invention discloses a method for preparing a WC / graphite composite coating on the surface of titanium alloy. The method includes the steps that firstly, the surface of a titanium alloy base material is pretreated so that an oxidation film on the surface is removed; secondly, WC powder and diamond powder are evenly mixed to obtain mixed powder, a polyvinyl alcohol aqueous solution is added into the mixed powder and stirred evenly, and a cladding material is obtained; thirdly, the cladding material is arranged on the surface of the titanium alloy base material in advance, and a precoated layer is obtained after drying; and fourthly, laser cladding treatment is carried out on the surface of the titanium alloy base material with the precoated layer, and the WC / graphite composite coating is obtained through preparation. Polymorphism occurs to the diamond in the precoated layer on the surface of the titanium alloy base material through the heat generated in the laser cladding treatment, and graphite is generated after conversion. The defect that a graphite coating can not be prepared through the laser technology in the prior art is overcome, the WC / graphite composite coating is prepared on the surface of the titanium alloy, the abrasion resistance of the surface of the titanium alloy is improved, and the friction coefficient of the titanium alloy is lowered.

Description

technical field [0001] The invention belongs to the technical field of metal surface coating preparation, and in particular relates to a method for preparing a WC / graphite composite coating on the surface of a titanium alloy. Background technique [0002] Titanium alloy has the characteristics of low density, high specific strength, excellent corrosion resistance and relatively good high-temperature mechanical properties. It is one of the important materials used in aviation, navigation, chemical and biological industries, but the hardness of titanium and titanium alloys Low, poor wear resistance, when used as a friction part, it is easy to wear and cause component failure. In order to improve the wear resistance of titanium alloy, it is necessary to carry out surface treatment on titanium alloy. There are many ways to improve the wear resistance of titanium alloys, and the surface technology applied to steel can basically be applied to titanium alloys. Chemical heat treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 王少鹏李争显黄春良王培杜继红叶源盛
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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