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Tungsten carbide-yttria-stabilized zirconia composite thermal barrier coating and preparation method thereof

A technology for stabilizing zirconia and thermal barrier coatings, applied in coatings, metal material coating processes, melt spraying, etc., can solve the problem of poor coating adhesion, uneven particle distribution of thermal barrier coatings, and poor wear resistance. and other problems, to achieve the effect of improving wear resistance, low cost and improved wear resistance

Active Publication Date: 2021-09-24
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a tungsten carbide-yttria stabilized zirconia composite thermal barrier coating and its preparation method, which solves the problems of uneven particle distribution, poor coating adhesion, and poor wear resistance of traditional thermal barrier coatings.

Method used

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  • Tungsten carbide-yttria-stabilized zirconia composite thermal barrier coating and preparation method thereof
  • Tungsten carbide-yttria-stabilized zirconia composite thermal barrier coating and preparation method thereof
  • Tungsten carbide-yttria-stabilized zirconia composite thermal barrier coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1, configure ZrOCl 2 ·8H 2 O / Y(NO 3 ) 3 ·6H 2 O mixed solution: 1500mL of mixed solution, ZrOCl 2 ·8H 2 O / Y(NO 3 ) 3 ·6H 2 The mass fraction of O is 20wt.%, Zr 4+ the Y 3+ The molar concentration ratio is 89:11.

[0042] In step 2, excessive ammonia water is added dropwise to the mixed solution in step 1 and continuously stirred to form a white precipitate, and the concentration of ammonia water is 30%.

[0043] Step 3, add a certain amount of PVA aqueous solution to the solution in step 2, wherein the concentration of PVA is 5%, and the addition amount is 200mL.

[0044] Step 4, add a certain amount of nanoscale WC particles to the mixed solution of step 3, the particle diameter is 100nm, the mass fraction of adding WC particles accounts for ZrO 2 10wt.% of coating.

[0045] In step 5, the mixture in step 4 is placed on a roller ball mill for ball milling; the speed of the roller ball mill is 40r / min, and the working time is 48h.

[0046] Step 6, gra...

Embodiment 2

[0049] Step 1, configure ZrOCl 2 ·8H 2 O / Y(NO 3 ) 3 ·6H 2 O mixed solution; the volume of mixed solution is 1500mL, ZrOCl 2 ·8H 2 O / Y(NO 3 ) 3 ·6H 2 The mass fraction of O is 60wt.%, Zr 4+ the Y 3+ The molar concentration ratio is 97:3.

[0050] In step 2, excessive ammonia water is added dropwise to the mixed solution in step 1 and continuously stirred to form a white precipitate, and the concentration of ammonia water is 50%.

[0051] Step 3, add a certain amount of PVA aqueous solution to the solution in step 2, wherein the concentration of PVA is 10%, and the added amount is 300mL.

[0052] Step 4, add a certain amount of nanoscale WC particles to the mixed solution of step 3, the particle size range is 300nm, and the mass fraction of the added WC particles accounts for ZrO 2 30wt.% of the coating.

[0053] In step 5, the mixture in step 4 is placed on a roller ball mill for ball milling; the speed of the roller ball mill is 80r / min, and the working time is 24...

Embodiment 3

[0057] Step 1, configure ZrOCl 2 ·8H 2 O / Y(NO 3 ) 3 ·6H 2 O mixed solution; the volume of mixed solution is 1500mL, ZrOCl 2 ·8H 2 O / Y(NO 3 ) 3 ·6H 2 The mass fraction of O is 30wt.%, Zr 4+ the Y 3+ The molar concentration ratio is 95:5.

[0058] In step 2, excess ammonia water is added dropwise to the mixed solution in step 1 and continuously stirred to form a white precipitate, and the concentration of ammonia water is 40%.

[0059] Step 3, add a certain amount of PVA aqueous solution to the solution in step 2, wherein the concentration of PVA is 8%, and the addition amount is 250mL.

[0060] Step 4, add a certain amount of nanoscale WC particles to the mixed solution of step 3, the particle size range is 200nm, and the mass fraction of the added WC particles accounts for ZrO 2 20wt.% of the coating.

[0061] In step 5, the mixture in step 4 is placed on a roller ball mill for ball milling; the speed of the roller ball mill is 60r / min, and the working time is 36h...

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Abstract

The invention relates to a tungsten carbide-yttria-stabilized zirconia composite thermal barrier coating and a preparation method thereof. The preparation method comprises the following steps that step 1, a ZrOCl2.8H2O / Y (NO3)3.6H2O mixed solution is prepared; step 2, excessive ammonia water is added into a mixed solution A, and continuously stirring is carried out until white precipitate is generated; step 3, a PVA aqueous solution is added to form a mixed solution B; 4, nanoscale WC particles are added, and a mixture is formed; 5, the mixture in the step 4 is placed on a roller type ball mill for ball milling, and slurry obtained after ball milling is obtained; step 6, the slurry subjected to ball milling in the step 5 is granulated on a spray granulator, and dried Zr(OH)4, Y(OH)3 and WC spherical spray feed mixed powder is obtained after moisture is removed; and 7, the spherical spray feed mixed powder is placed in a powder feeder, thermal spraying is conducted on the surface of a metal substrate in a vacuum plasma spraying mode, Zr(OH)4 and Y(OH)3 are subjected to high-temperature decomposition under the high-temperature flame condition, Y<3+> is dissolved in ZrO2 crystal lattices, and the WC-YSZ composite thermal barrier coating with high abrasion resistance and high compactness is formed by the ZrO2 crystal lattices and WC.

Description

technical field [0001] The invention belongs to the technical field of high temperature protection, and in particular relates to a tungsten carbide-yttria stabilized zirconia composite thermal barrier coating and a preparation method thereof. Background technique [0002] As a high temperature protection technology, thermal barrier coating is used to reduce the influence of steam turbine or engine blades from high temperature environment, which can greatly prolong the service life of blades and increase the working temperature of the machine. [0003] As a traditional thermal barrier coating material, yttria-stabilized zirconia (YSZ) coating has the advantages of high melting point, stable thermal expansion coefficient, and small thermal conductivity. However, due to the limitations of the material itself, the wear and erosion resistance of YSZ thermal barrier coating still needs to be improved, which greatly limits the application range of this thermal barrier coating. Tun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/134
CPCC23C4/10C23C4/134
Inventor 张磊曹海涛杨哲一崔锦文王弘喆崔雄华
Owner XIAN THERMAL POWER RES INST CO LTD
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