Method for preparing whisker toughened composite coating by liquid-phase method spraying process

A technology of composite coating and liquid phase method, which is applied in the direction of metal material coating process, coating, molten spraying, etc., and can solve the problems of difficult control of the process, low success rate, and high cost

Active Publication Date: 2021-05-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the technical methods such as CVD and PVD that whisker-doped composite coatings rely on in thermal barrier coatings have problems such as high equipment requirements, difficult technical implementation, high cost, difficult process control, and low success rate. for industrial application

Method used

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  • Method for preparing whisker toughened composite coating by liquid-phase method spraying process
  • Method for preparing whisker toughened composite coating by liquid-phase method spraying process
  • Method for preparing whisker toughened composite coating by liquid-phase method spraying process

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A kind of liquid-phase method spraying process of the present embodiment prepares the method for whisker toughening composite coating to carry out as follows:

[0038] 1. Add zirconia whiskers with an aspect ratio of about 30 and yttria-stabilized zirconia (yttrium oxide content is 8wt.%) nanopowders into the solvent to prepare a mixed solution. The whiskers and nanopowders The mass ratio is 1:1, the solid phase (the total amount of zirconia whiskers and yttria-stabilized zirconia) content of the mixed solution is 30wt.%, the solvent is distilled water, and then ammonium polyacrylate and PEG-1000 are added to obtain suspension. The mass of ammonium polyacrylate and PEG-1000 are both 1wt.% of the suspension mass.

[0039] 2. Ultrasonic disperse the suspension prepared in step 1 for 1 hour, and then perform ball milling treatment. The rotational speed of the ball mill is 300 r / min, and the ball milling time is 8 hours.

[0040] 3. Place the suspension treated in step 2 ...

Embodiment 2

[0044] The difference between this embodiment and Example 1 is that the whiskers in step 1 are silicon carbide whiskers, the solid phase content of the mixed solution is 20wt.%, the ball milling time in the ball milling process of step 2 is 12h, and the spraying voltage in step 3 is 120V, spraying current 440A, peristaltic pump speed 50ml / min. Others are the same as in Example 1.

Embodiment 3

[0046] The difference between this embodiment and Example 1 is that the whiskers in step one adopt silicon nitride whiskers, the mass ratio of whiskers to nanometer YSZ powder is 1:3, and the solid phase content of the mixed solution is 20%. Step two The ball milling time in step 3 is 24 hours, the spraying voltage in step 3 is 80V, the spraying current is 360A, the rotating speed of the peristaltic pump is 50ml / min, and the air pressure in the inner hole is 0.5MPa. Others are the same as in Example 1.

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Abstract

The invention discloses a method for preparing a whisker toughened composite coating through a liquid-phase method spraying process, and belongs to the field of nano thermal protection coating preparation. Whiskers and ceramic-based nano powder are mixed and then added into a solvent, then a dispersing agent and a softening agent are added to obtain a suspension, the suspension is sprayed out through a centrifugal atomizer after being subjected to ball milling, the atomized suspension is melted under the action of a plasma heat source of plasma spraying and impacts the surface of a base body, and the whisker toughened composite ceramic coating is obtained. The method is short in preparation period, simple in process, easy to control, capable of achieving large-scale production and wide in application market.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a method for preparing a whisker-toughened composite coating by a liquid-phase spraying process. Background technique [0002] Thermal barrier coatings are widely used on the surface of hot-end components such as aero-engines, gas turbines, and high-end control valves. They are functional coatings with thermal protection and thermal barrier effects. The application of thermal barrier coating greatly improves the service life and thermal efficiency of the engine. However, due to the characteristics of high brittleness and low fracture toughness of ceramic coatings, cracks inevitably occur during long-term service, and the coating will eventually peel off and fail as the cracks expand. With the requirements of higher thrust-to-weight ratio and heat transfer ratio, traditional ceramic coatings are increasingly unable to meet the needs of future development. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/48C04B35/495C04B35/50C04B35/505C04B35/622C04B35/80C23C4/134C23C4/10
CPCC04B35/48C04B35/50C04B35/505C04B35/495C04B35/44C04B35/62222C23C4/134C23C4/10C04B2235/5276C04B2235/3246C04B2235/3248C04B2235/3224C04B2235/3222
Inventor 白宇胡永宝柳琪王玉
Owner XI AN JIAOTONG UNIV
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