Preparation method of CMAS high temperature and corrosion resistant composite thermal barrier coating

A thermal barrier coating, high temperature corrosion technology, applied in the direction of coating, metal material coating process, fusion spray plating, etc., can solve the problems of low bonding strength, poor thermal shock resistance, etc., to achieve low porosity, thermal shock resistance Good performance, improve the effect of CMAS corrosion resistance

Inactive Publication Date: 2019-03-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Divalent metal ion doping La of the present invention 2 Ce 2 o 7 The crystal structure of the thermal barrier coating ceramic material is a defective fluorite structure, and the particle size of the powder is 50-150nm. poor sex

Method used

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  • Preparation method of CMAS high temperature and corrosion resistant composite thermal barrier coating
  • Preparation method of CMAS high temperature and corrosion resistant composite thermal barrier coating
  • Preparation method of CMAS high temperature and corrosion resistant composite thermal barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: Formulating LZ / Al for Plasma Spraying 2 o 3 compound powder;

[0037] LZ powder with a particle size range of 15 microns to 40 microns, Al with a particle size range of 0.07 microns to 1 micron 2 o 3 Mix the powder evenly into a powder mixture. Among them, Al 2 o 3 The weight percentage of LZ powder accounting for the total mass of raw material powder is 5%, the weight percentage of LZ powder accounting for the total mass of raw material powder is 95%, and the weight percentage of Al 2 o 3 The weight ratio between LZ and LZ is 5:95, and then uniformly mix into the binder with a weight ratio of powder: polyvinyl alcohol = 100:1, ultrasonically vibrate for 20 minutes, and then stir for 90 minutes by mechanical mixing. This is formulated as LZ / Al for plasma spraying 2 o 3 compound powder;

[0038] The second step, metal matrix material pretreatment:

[0039] Sandblasting is performed on the surface of the GH3044 nickel-based superalloy to be coated, and ...

Embodiment 2

[0043] Step 1: Formulating LZ / Al for Plasma Spraying 2 o 3 compound powder;

[0044] LZ powder with a particle size range of 15 microns to 40 microns, Al with a particle size range of 0.07 microns to 1 micron 2 o 3 Mix the powder evenly into a powder mixture. Among them, Al 2 o 3 The weight percentage of LZ powder accounting for the total mass of raw material powder is 10%, the weight percentage of LZ powder accounting for the total mass of raw material powder is 90%, and the weight percentage of Al 2 o 3 The weight ratio between LZ and LZ is 10:90, and then uniformly mix into the binder with a weight ratio of powder: polyvinyl alcohol = 100:1, ultrasonically vibrate for 20 minutes, and then stir for 90 minutes by mechanical mixing. This is formulated as LZ / Al for plasma spraying 2 o 3 compound powder;

[0045] The second step, metal matrix material pretreatment:

[0046] Sandblasting is performed on the surface of the GH3044 nickel-based superalloy to be coated, an...

Embodiment 3

[0050] Step 1: Formulating LZ / Al for Plasma Spraying 2 o 3 compound powder;

[0051] LZ powder with a particle size range of 15 microns to 40 microns, Al with a particle size range of 0.07 microns to 1 micron 2 o 3 Mix the powder evenly into a powder mixture. Among them, Al 2 o 3 Powder accounts for 15% by weight of the total mass of raw material powder, LZ powder accounts for 85% by weight of the total mass of raw material powder, Al 2 o 3 The weight ratio between LZ and LZ is 15:85, and then evenly mix into the binder with a weight ratio of powder: polyvinyl alcohol = 100:1, ultrasonically vibrate for 20 minutes, and then stir for 90 minutes by mechanical mixing. This is formulated as LZ / Al for plasma spraying 2 o 3 compound powder;

[0052] The second step, metal matrix material pretreatment:

[0053] Sandblasting is performed on the surface of the GH3044 nickel-based superalloy to be coated, and then a NiCoCrAlY bottom layer is sprayed on the surface of the meta...

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Abstract

The invention relates to a preparation method of a CMAS high temperature and corrosion resistant composite thermal barrier coating. The preparation method comprises the steps that LZ ceramic powders and Al2O3 powders are mechanically mixed, and LZ/Al2O3 composite powders are obtained by ultrasonic concussion, and then the LZ/Al2O3 composite coating with Al2O3 content being 5%-30% is synthesized byplasma spray. According to the preparation method of the CMAS high temperature and corrosion resistant composite thermal barrier coating, the thermal shock resistance of TBCs is improved, and the defect of the loss of corrosion resistance of a coating in CMAS environment is overcome.

Description

technical field [0001] Technical scheme of the present invention relates to using LZ / Al 2 o 3 Plating of nickel-based superalloys, specifically LZ / Al 2 o 3 Preparation method of composite coating. Background technique [0002] Thermal barrier coatings (Thermal Barrier Coatings, TBCs) have been widely used in high-temperature components of ground gas turbines and aero-engines to block direct contact between metal parts and high-temperature gas to effectively protect multifunctional matrix materials [1-3]. However, when the working temperature is higher than that, the deposit CMAS (CaO-MgO-Al 2 o 3 -SiO 2 ) deposited at 1200°C or higher will melt and wet the surface of the coating, and long-term high temperature will increase the fluidity of the molten CMAS, causing it to penetrate into the microstructure of the ceramic layer. During the cooling process, CMAS solidifies to form a rigid glass body, which reduces the porosity and strain tolerance of the coating, improves ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/11C23C4/134
CPCC23C4/11C23C4/134
Inventor 董天顺王冉李国禄付彬国刘利冯阳
Owner HEBEI UNIV OF TECH
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