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Method for synchronously feeding powder to prepare ceramic based thermal barrier coating of continuous and gradual variation structure

A technology of gradient structure and thermal barrier coating, applied in coatings, metal material coating processes, sustainable transportation, etc., can solve the problems of insufficient melting of high-melting-point materials and over-melting of low-melting-point materials, and achieve low interlayer stress. , the effect of improving coating quality and broad application prospects

Active Publication Date: 2016-09-21
XI AN JIAOTONG UNIV
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Problems solved by technology

However, at present, the gradient coating is basically prepared by mechanically mixing raw material powders and then depositing them layer by layer. Due to the difference in melting point of raw material powders, it often occurs that low melting point materials are over-melted and high-melting point materials are under-melted. Therefore, improvement is needed. its preparation method

Method used

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  • Method for synchronously feeding powder to prepare ceramic based thermal barrier coating of continuous and gradual variation structure
  • Method for synchronously feeding powder to prepare ceramic based thermal barrier coating of continuous and gradual variation structure
  • Method for synchronously feeding powder to prepare ceramic based thermal barrier coating of continuous and gradual variation structure

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Embodiment 1

[0023] A method for preparing a continuous gradient ceramic-based composite thermal barrier coating uses CoNiCrAlY alloy powder as a raw material, and uses a supersonic plasma spraying technology to spray an alloy bonding layer on a sandblasted polycrystalline superalloy substrate. The two materials of gradient coating are: A material is YSZ, B material is LC. use figure 1 The powder feeder automatic control system is shown to adjust the powder feeding rate, where a is the powder feeder control system, b and c are the powder feeders for YSZ and LC materials respectively, and d is the double powder feeding nozzle. Spraying 19 times in total, the powder feeding rate of YSZ decreases linearly from 40g / min to 0 with the number of spraying times through the powder feeder control system, and the powder feeding rate of LC increases linearly from 0 to 40g / min with the number of spraying times , forming a complete thermal barrier coating system. The cross-sectional morphology of the ...

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Abstract

The invention provides a method for synchronously feeding powder to prepare a ceramic based thermal barrier coating of a continuous and gradual variation structure. The obtained ceramic based thermal barrier coating of the continuous and gradual variation structure is stable in structure and excellent in thermal shock resistance and thermal insulation. The method comprises the following steps that firstly, a bonding layer is prepared on a high-temperature alloy matrix, specifically, the thickness of the bonding layer is 50-200 [mu]m; and secondly, independently researched and developed dual-powder-feeding nozzles are adopted, and the ceramic coating of the continuous and gradual variation structure and made of two kinds of materials of A and B is sprayed on the bonding layer obtained in the first step. Through the method, a continuous and gradual variation thermal barrier coating system which is stable and reliable in quality and excellent in high-temperature shock resistance is obtained finally, and has wide application prospects in the national defense sophisticated industries such as air-turbine motors and heavy duty gas turbines.

Description

technical field [0001] The invention relates to the preparation of a high-performance thermal barrier coating, in particular to a preparation method of a ceramic-based composite thermal barrier coating with a continuous gradient structure, belonging to the field of composite materials. Background technique [0002] Thermal barrier coating is a functional coating applied on the surface of a metal substrate to reduce the temperature of the substrate to ensure its normal use under high temperature conditions. Its design idea is mainly to use the advantages of high melting point, low thermal conductivity and high toughness of metal materials to form a coating system (multi-layer structure) to meet the requirements of high temperature use. At present, thermal barrier coatings generally adopt a multi-layer structure. The surface layer of this structure is composed of low thermal conductivity and corrosion-resistant ceramic materials, which mainly play a role in heat insulation in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/11C23C4/073C23C4/134
CPCC23C4/06Y02T50/60
Inventor 白宇刘琨范微强永明
Owner XI AN JIAOTONG UNIV
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