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Preparation method of microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer

A technology of micro-arc oxidation and composite ceramics, which is applied in the direction of anodic oxidation, coating, electrolytic inorganic material coating, etc., can solve the problems that the performance is difficult to meet the use requirements, the consistency and uniformity of the composite ceramic layer are poor, and achieve the overall modification , low price and low production cost

Inactive Publication Date: 2017-06-09
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of micro-arc oxidation-tungsten disulfide self-lubricating composite ceramic layer, which solves the problem that the consistency and uniformity of the composite ceramic layer obtained by the existing preparation method are poor, and the performance is difficult to meet the use requirements The problem

Method used

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  • Preparation method of microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer
  • Preparation method of microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer
  • Preparation method of microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The selected sample is LY12 aluminum alloy, and its shape is a sheet of 40*20*4mm. The specific preparation process conditions and operation steps are as follows:

[0036] 1. Pre-treatment of the sample: Polish the surface of the aluminum alloy sample with 400#, 600#, 800# and 1000# sandpaper successively, then degrease with acetone, rinse with deionized water, and dry it for later use;

[0037] 2. Electrolyte preparation: first mix and dissolve the reagents of sodium silicate 8g / L, sodium hexametaphosphate 10g / L, ammonium metavanadate 2.5g / L and sodium dodecylbenzenesulfonate 60mg / L; / L ammonium thiotungstate is dissolved in an ultrasonic water bath of deionized water, 20mg / L ethanol is added, and then added to the original electrolyte, and ultrasonic waves and mechanical stirring are applied at the same time to fully dissolve and disperse the added reagents, and prepare a product containing WS 4 2- the electrolyte;

[0038] 3. Electrical parameter setting: adopt co...

Embodiment 2

[0043] The selected sample is LY12 aluminum alloy, and its shape is a sheet of 30*15*5mm. The specific preparation process conditions and operation steps are as follows:

[0044] 1. Sample pretreatment: same as Example 1;

[0045] 2. Electrolyte preparation: first mix and dissolve the reagents of sodium silicate 10g / L, sodium hexametaphosphate 12g / L, ammonium metavanadate 3g / L and sodium dodecylbenzenesulfonate 80mg / L; L ammonium thiotungstate was dissolved in deionized water ultrasonic water bath, 20mg / L ethanol was added, and then added to the original electrolyte, while ultrasonic waves and mechanical stirring were applied to fully dissolve and disperse the added reagents, and prepared a compound containing WS 4 2- the electrolyte;

[0046] 3. Electrical parameter setting: adopt constant voltage mode, constant voltage 500V, frequency 300Hz, duty cycle 8%, response time 20min;

[0047] 4, micro-arc oxidation: with embodiment 1;

[0048] 5, aftertreatment: with embodiment...

Embodiment 3

[0050] The selected sample is LY12 aluminum alloy, and its shape is a sheet of 30*15*3mm. The specific preparation process conditions and operation steps are as follows:

[0051] 1. Sample pretreatment: same as Example 1;

[0052] 2. Electrolyte preparation: first mix and dissolve the reagents of sodium silicate 6g / L, sodium hexametaphosphate 15g / L, ammonium metavanadate 4g / L and sodium dodecylbenzenesulfonate 30mg / L; L ammonium thiotungstate was dissolved in deionized water ultrasonic water bath, 30mg / L ethanol was added, and then added to the original electrolyte, while ultrasonic waves and mechanical stirring were applied to fully dissolve and disperse the added reagents, and the preparation containing WS 4 2- the electrolyte;

[0053] 3. Electric parameter setting: same as embodiment 1;

[0054] 4, micro-arc oxidation: with embodiment 1;

[0055] 5, aftertreatment: with embodiment 1.

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Abstract

The invention discloses a preparation method of a microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer. Sodium silicate, sodium hexametaphosphate, ammonium metavanadate and an anionic dispersing agent are mixed and dissolved to obtain mixed solution; thio-ammonium tungstate performs ultrasonic water bath dissolving by de-ionized water, is added with a wetting agent, and is added in the mixed solution; the ultrasonic wave and the mechanical stirring effect are synchronously applied, so that added reagents are fully dissolved and dispersed to prepare electrolyte containing WS42-; a circulating cooling water device is started; a pretreated metal sample is connected to an electric conducting rod to dip in the electrolyte as an anode; a stainless steel electrolytic cell also serves as a cathode; a microarc oxidation power supply is started for microarc oxidation; and then, the drying is performed to obtain the microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer. The prepared ceramic layer is smooth in surface, uniform in thickness, high in compactness and firm in combination with a basal body, has such prominent advantages as low friction factor and wear rate and excellent self-lubricating performance, and satisfies actual application requirements.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a preparation method of a micro-arc oxidation-tungsten disulfide self-lubricating composite ceramic layer. Background technique [0002] Micro-arc oxidation (also known as plasma oxidation) is a kind of instantaneous high temperature and high pressure generated by arc discharge on aluminum, magnesium, titanium, zirconium, tantalum, niobium and their surfaces through the combination of electrolyte and corresponding electrical parameters. A new surface treatment technology that grows a ceramic layer dominated by a matrix metal oxide. The prepared ceramic layer is firmly combined with the substrate, has a compact structure, high toughness, and has good properties such as wear resistance, corrosion resistance, high temperature impact resistance, electrical insulation and the like. The micro-arc oxidation technology is easy to implement, the function of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02C25D9/06
CPCC25D9/06C25D11/026
Inventor 李均明王红军陈鼎
Owner XIAN UNIV OF TECH
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