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Metal composite ceramic thermal barrier coating preparation method

A technology of thermal barrier coating and metal compounding, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., and can solve the problems of easy cracking, peeling, poor toughness and low structural strength of the coating, etc.

Active Publication Date: 2015-07-15
襄阳航泰动力机器厂
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the coating has the disadvantages of low structural strength and poor toughness, and the coating is prone to cracking and peeling during the working process.

Method used

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Experimental program
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Embodiment Construction

[0018] The present invention is described in further detail below with embodiment.

[0019] The invention utilizes the plasma spraying technology to spray the metal composite ceramic thermal barrier coating on the superalloy substrate. The process is as follows:

[0020] 1. Ultrasonic cleaning is performed on the surface of superalloy parts to remove carbon deposits and oil stains on the surface. The cleaning agent adopts water-based detergent to ensure no corrosion to parts.

[0021] 2. The surface of the parts is roughened by sandblasting. White corundum sand is used, with a particle size of 20 mesh to 40 mesh, sand blowing angle: 60°~120°, sand blowing distance: 80mm~150mm, air pressure: 0.4MPa~0.6 MPa, and the surface roughness after sand blowing is controlled at 5.0~ 8.0um.

[0022] 3. Use plasma spraying nickel-chromium-aluminum-cobalt-yttrium powder as the bottom layer, the powder feeding nozzle is close to the root of the spray gun, the powder feeding angle is perp...

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Abstract

The invention discloses a metal composite ceramic thermal barrier coating preparation method, belongs to the technical field of thermal spraying, and mainly aims to solve the problem of low structural strength and poor toughness of zirconia coating which is stabilized by yttrium oxide. The metal composite ceramic thermal barrier coating preparation method is mainly characterized in that: 1, cleaning high temperature alloy matrix surface, 2, sand-blasting roughening the cleaned high temperature alloy matrix surface, 3, spraying the sand-blasting roughened matrix surface with nickel chromium aluminum cobalt yttrium powder by plasma to use as a bottom layer, and 4, spraying the nickel chromium aluminum cobalt yttrium bottom layer with a plasma spraying material to obtain a metal composite ceramic thermal barrier coating, wherein the plasma spraying material comprises 25%-27% of Ni, 5-7% of Cr, 0.5%-2% of Al and 64%-66% ofZrO2.Y2O3. The metal composite ceramic thermal barrier coating prepared by the method has the characteristics of being high in combination strength, good in toughness, and capability of working in hot and cold alternating environment of 950 DEG C to room temperature for 1500h, and the method is mainly used for the preparation of metal composite ceramic thermal barrier coatings with good toughness and high strength of combination with the matrix.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, and in particular relates to a plasma spraying process of a metal composite ceramic thermal barrier coating. Background technique [0002] Modern aero-engines and civil gas turbine turbines and combustion chamber components are used at higher and higher temperatures, while the existing superalloy materials have reached their limit. In order to increase the power of engines and gas turbines, spraying thermal barrier ceramic coatings on the hot end parts has become one of the more effective solutions to increase the operating temperature. [0003] Commonly used thermal barrier ceramic coatings are mainly sprayed yttria-stabilized zirconia (ZrO 2 ·Y 2 o 3 ) coating, yttria-stabilized zirconia is a ceramic oxide with poor thermal conductivity, which has an ionic or covalent bond structure and high bond energy, so it has a high ignition point and stable chemical properties. It is an ideal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/06C23C4/10C23C4/073C23C4/134
Inventor 陈辉张莹松明继清黄新民张军战李宇峰孙红梅谢锋
Owner 襄阳航泰动力机器厂
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