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Method for preparing thermal expansion matching composite thermal barrier coating

A thermal barrier coating and thermal expansion technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problems of ineffective elimination, complicated preparation process, etc., to eliminate the interface thermal stress, the process is simple, The effect of reducing severe losses

Inactive Publication Date: 2010-09-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the metal bonding layer can alleviate the thermal expansion coefficient mismatch between the coating and the substrate, it cannot be effectively eliminated, and the preparation process is more cumbersome

Method used

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  • Method for preparing thermal expansion matching composite thermal barrier coating
  • Method for preparing thermal expansion matching composite thermal barrier coating
  • Method for preparing thermal expansion matching composite thermal barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Cut the HRA929 alloy into Φ25mm×4mm;

[0022] 2) According to the principle of thermal expansion matching, the ratio of Zr 0.98 f 0.01 Y 0.01 o 1.995 Thermal barrier coating material nano powder and Zr 0.95 Dy 0.05 W 1.7 Mo 0.3 o 7.975 Negative thermal expansion material micron powder, the average particle size is 20nm and 50μm;

[0023] 3) will prepare Zr 0.98 f 0.01 Y 0.01 o 1.995 with Zr 0.95 Dy 0.05 W 1.7 Mo 0.3 o 7.975 The two kinds of powders are reconstituted by micro-nano composite by encapsulation method;

[0024] 4) Laser irradiate the reconstituted composite particles, the irradiation parameters are: power 200W, spot diameter 10mm, defocus amount 5mm, scanning speed 8mm / s, overlap rate 10%, to increase the bonding strength of the composite particles;

[0025] 5) Put the composite particles into the powder feeder, prepare a 200 μm thick composite thermal barrier coating by vacuum plasma spraying process, the spraying process parameters are...

Embodiment 2

[0031] 1) Add Nd 14.5 Dy 1.5 Fe71 co 4.5 B 7.5 The alloy is cut into Φ25mm×4mm;

[0032] 2) According to the thermal expansion matching principle, the ratio Hf 0.97 Nd 0.03 o 1.985 Thermal barrier coating material nano powder and Zr 0.99 Tb 0.01 wxya 7.995 Negative thermal expansion material micron powder, the average particle size is 100nm and 20μm;

[0033] 3) The prepared Hf 0.97 Nd 0.03 o 1.985 with Zr 0.99 Tb 0.01 wxya 7.995 The two kinds of powders are reconstituted by micro-nano composite by encapsulation method;

[0034] 4) Laser irradiate the reconstituted composite particles, the irradiation parameters are: power 100W, spot diameter 8mm, defocus amount -5mm, scanning speed 1mm / s, overlap rate 30%, to increase the bonding strength of the composite particles;

[0035] 5) Put the composite particles into the powder feeder, prepare a 100 μm thick composite thermal barrier coating by vacuum plasma spraying process, the spraying process parameters are: arc ...

Embodiment 3

[0041] 1) Cut the Ti-6Al-4V alloy into Φ25mm×4mm;

[0042] 2) According to the principle of thermal expansion matching, the ratio of Zr 0.5 h 0.45 Yb 0.05 o 1.975 Thermal barrier coating material nano powder and Zr 0.98 Nd 0.01 Ho 0.01 wxya 7.99 Negative thermal expansion material micron powder, the average particle size is 70nm and 60μm;

[0043] 3) will prepare Zr 0.5 f 0.45 Yb 0.05 o 1.975 with Zr 0.98 Nd 0.01 Ho 0.01 wxya 7.99 The two kinds of powders are reconstituted by micro-nano composite by encapsulation method;

[0044] 4) Laser irradiate the reconstituted composite particles, the irradiation parameters are: power 20W, spot diameter 3mm, defocus amount 0.5mm, scanning speed 5mm / s, overlap rate 90%, to increase the bonding strength of the composite particles;

[0045] 5) Put the composite particles into the powder feeder, prepare a 350 μm thick composite thermal barrier coating by vacuum plasma spraying process, the spraying process parameters are: arc...

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Abstract

The invention discloses a method for preparing a thermal expansion matching composite thermal barrier coating, and relates to the field of surface coatings. The composite thermal barrier coating consists of a thermal barrier coating material Zr1-x-yHfxREyO2-y / 2 and a negative thermal expansion material Zr1-yREyW2-zMozO8-y / 2, wherein x is more than or equal to 0.01 and less than or equal to 1; y is more than or equal to 0.01 and less than or equal to 0.05; z is more than or equal to 0.3 and less than or equal to 1; and RE is one or more of La, Ce, Pr, Nd, Pm, SM, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc and Y. The method comprises the following steps of: 1) cutting a matrix alloy into a certain size; 2) according to the thermal expansion matching principle, matching thermal barrier coating nanopowder with negative thermal expansion material micropowder; 3) performing micro / nano composition reconstruction on two kinds of prepared powder; 4) performing laser radiation on reconstructed composite particles; and 5) filling the composite particles in a powder feeder, and preparing the thermal barrier coating through vacuum plasma spraying. The thermal barrier coating prepared has small interfacial stress, high bond strength, and good mechanical property. The method has simple process, is suitable for large-scale massive production, and can prepare the composite thermal barrier coating with firm interfacial bond.

Description

technical field [0001] The invention relates to the field of surface coating materials, in particular to a preparation method of a thermal expansion matching composite thermal barrier coating. Background technique [0002] Thermal barrier coatings were proposed as early as the early 1950s, and their main function is to reduce the working temperature of metal surfaces, usually oxide ceramics with excellent thermal insulation properties, and are currently widely used in aerospace, gas turbines and other fields. [0003] ZrO 2 Due to its high melting point, low thermal conductivity, good thermal shock resistance, and small difference between the thermal expansion coefficient and the metal substrate, ceramics have become an ideal thermal barrier coating material, and it is also the earliest researched and applied thermal barrier coating material. In order to overcome ZrO 2 The disadvantage of phase transformation at high temperature reduces its service life, it is necessary to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12B22F1/02C23C4/11C23C4/134
Inventor 崔熙贵程晓农崔承云许晓静张朝阳鲁金忠管海兵钱晓明
Owner JIANGSU UNIV
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