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Preparation method of a sintering-resistant thermal barrier ceramic coating structure

A ceramic coating and thermal barrier technology, applied in the field of thermal barrier coating preparation, can solve the problems of easy sintering, low temperature resistance, high thermal conductivity, etc., achieve low cost, high fracture toughness, and overcome low thermal conductivity Effect

Inactive Publication Date: 2017-03-15
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The powder obtained by this invention has to solve the problems of high thermal conductivity, low temperature resistance and easy sintering of YSZ materials. From the perspective of thermal conductivity alone, it can be used as a candidate material for TBCs, but other factors must be considered in practical applications. Such as corrosion resistance and thermal cycle life, etc.

Method used

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  • Preparation method of a sintering-resistant thermal barrier ceramic coating structure
  • Preparation method of a sintering-resistant thermal barrier ceramic coating structure
  • Preparation method of a sintering-resistant thermal barrier ceramic coating structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Electrophoretic coating preparation

[0032]First prepare a stable suspension for electrophoretic deposition, in which YSZ and iron oxide (Fe2O3) powders are ball milled in proportion to obtain uniformly mixed YSZ / Fe2O3 powders, and then the mass concentration of YSZ / Fe2O3 powders in the solvent is 40Kg / m3 . The solvent is a mixed solution of ethanol and deionized water, in which the volume ratio of ethanol and deionized water is 4:1, and the concentration of 0.1mol / L acetic acid is used to adjust the surface charge of YSZ particles in the suspension to prevent the aggregation of YSZ particles , the pH of the solution was adjusted to 2.0. Before the electrophoretic deposition process, the suspension was stirred for 2 minutes with an ultrasonic stirrer. During the deposition process, the anode was made of graphite plate, and the cathode was made of the target superalloy Fecralloy. The distance between the cathode and the anode was 10mm. The electrophoretic depos...

Embodiment 2

[0040] Step 1: Electrophoretic coating preparation

[0041] First prepare a stable suspension for electrophoretic deposition, in which YSZ and iron oxide (Fe2O3) powders are ball milled in proportion to obtain uniformly mixed YSZ / Fe2O3 powders, and then the mass concentration of YSZ / Fe2O3 powders in the solvent is 100Kg / m3 . The solvent is a mixed solution of ethanol and deionized water, in which the volume ratio of ethanol and deionized water is 4:1, and the concentration of 0.1mol / L acetic acid is used to adjust the surface charge of YSZ particles in the suspension to prevent the aggregation of YSZ particles , the pH of the solution was adjusted to 2.0. Before the electrophoretic deposition process, the suspension was stirred for 10 minutes with an ultrasonic stirrer. During the deposition process, the anode was made of graphite plate, and the cathode was made of the target superalloy Fecralloy. The distance between the cathode and the anode was 10mm. The electrophoretic de...

Embodiment 3

[0049] Step 1: Electrophoretic coating preparation

[0050] First prepare a stable suspension for electrophoretic deposition, in which YSZ and iron oxide (Fe2O3) powders are ball milled in proportion to obtain uniformly mixed YSZ / Fe2O3 powders, and then the mass concentration of YSZ / Fe2O3 powders in the solvent is 100Kg / m3 . The solvent is a mixed solution of ethanol and deionized water, in which the volume ratio of ethanol and deionized water is 4:1, and the concentration of 0.1mol / L acetic acid is used to adjust the surface charge of YSZ particles in the suspension to prevent the aggregation of YSZ particles , the pH of the solution was adjusted to 2.0. Before the electrophoretic deposition process, the suspension was stirred for 10 minutes with an ultrasonic stirrer. During the deposition process, the anode was made of graphite plate, and the cathode was made of the target superalloy Fecralloy. The distance between the cathode and the anode was 10 mm. The electrophoretic d...

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Abstract

The invention relates to a preparation method for a sintering resistant thermal barrier ceramic coating structure. The method includes: preparation of electrophoretic deposition turbid liquid, preparation of an electrophoretic coating, preparation of a phase inversion coating slurry, preparation of a phase inversion coating, sintering and other steps. According to the nonsolvent-induced phase separation principle and impregnation method, a porous ceramic coating with an asymmetric structure is prepared on the surface of high temperature alloy, the coating is sintered under air and argon atmosphere in two steps in the coating sintering, and a thermal barrier coating with an asymmetric structure is obtained. Compared with the prior art, the thermal barrier coating prepared by the method provided by the invention has the characteristics of simple process, stable microstructure, good sintering resistance and good thermal shock resistance, the method can prepare coatings on complex shape and asymmetric geometric surfaces, and is easy for mass industrial production. Compared with the prior art, the invention has a lot of advantages.

Description

technical field [0001] The invention relates to a preparation method of a thermal barrier coating, in particular to a preparation method of a sintering-resistant thermal barrier ceramic coating structure. Background technique [0002] Thermal barrier coatings (Thermal Barrier Coatings-TBCs) technology has developed rapidly from the late 1980s to the early 1990s, and has been widely used in aviation, aerospace, ships and other fields, and has played a significant role in the land-based gas turbine industry. increasingly important role. Thermal barrier coating is to use the superior high temperature resistance, corrosion resistance and low thermal conductivity of ceramic materials to combine ceramics and metal substrates in the form of coatings to increase the working temperature of metal hot end parts and enhance the resistance to high temperature oxidation of hot end parts It is a surface protection technology that prolongs the service life of hot end parts and improves eng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D13/02
Inventor 郭芳威周新义赵晓峰肖平
Owner SHANGHAI JIAOTONG UNIV
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