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Preparation method for thermal barrier coating of high strain tolerance columnar structure

A technology of columnar structure and thermal barrier coating, applied in the field of materials, can solve problems such as the inability to use workpieces with complex structures, and achieve the effect of improving life expectancy

Active Publication Date: 2016-08-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the thermal barrier coating prepared by electron beam physical vapor deposition can only be used on flat planar workpieces, and cannot be applied to workpieces with complex structures.

Method used

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  • Preparation method for thermal barrier coating of high strain tolerance columnar structure
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  • Preparation method for thermal barrier coating of high strain tolerance columnar structure

Examples

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Embodiment 1

[0029] A method for preparing a thermal barrier coating with a high strain tolerance columnar structure, comprising the following steps: placing a superalloy substrate with a bonding layer at a distance of 950mm from the starting point of the mixed beam, and controlling the chamber pressure at 150Pa , the surface of the superalloy was preheated to 960°C, and then the yttrium oxide partially stabilized zirconia (YSZ) powder (M6700, ZrO 2 / Y 2 o 3 =87 / 13, powder particle size -22+5μm) heated and evaporated to form a flow of microparticles containing zirconium ions, oxygen ions, zirconium oxide ions and their clusters, together with plasma gases Ar gas and He gas to form a mixed beam. The intake volumes of the plasma gases Ar and He are 35NLPM and 60NLPM, respectively. The beam is continuously deposited on the superalloy substrate, and the deposition time is 20 minutes.

[0030] The surface structure of the thermal barrier coating prepared in Example 1 is as follows: figure 1...

Embodiment 2

[0032] A method for preparing a thermal barrier coating with a high strain tolerance columnar structure, comprising the following steps: placing a superalloy substrate with a bonding layer at a distance of 350mm from the starting point of the mixed beam, and controlling the chamber pressure at 10Pa , the superalloy surface is preheated to 850 °C, and then the lanthanum zirconate La 2 Zr 2 o 7 (LZO) powder is heated and evaporated to form a flow of fine particles containing lanthanum ions, zirconium ions, oxygen ions, zirconium oxide ions and their clusters, which together with the carrier gas Ar gas form a mixed beam flow. Finally, the superalloy substrate is deposited intermittently by scanning at a scanning speed of 1000mm / s.

Embodiment 3

[0034]A method for preparing a thermal barrier coating with a high strain tolerance columnar structure, comprising the following steps: placing a stainless steel substrate with an adhesive layer at a distance of 900mm from the starting point of the mixed beam, controlling the chamber pressure at 350Pa, The stainless steel surface is preheated to 720°C, and then the cerium oxide CeO 2 The powder is heated and evaporated to form a flow of fine particles containing cerium ions, oxygen ions, cerium oxide ions and their clusters, which together with plasma gases Ar and He form a mixed beam. The intake volumes of the plasma gases Ar and He are 30NLPM and 55NLPM, respectively. Finally, scanning intermittent deposition is carried out on the stainless steel substrate at a scanning speed of 500mm / s.

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Abstract

The invention discloses a preparation method for a thermal barrier coating of a high strain tolerance columnar structure. The thermal barrier coating is of the columnar structure with intercolumnar pores and thus has high strain tolerance. The preparation method comprises the steps that under the chamber pressure of 10-5000 Pa, mixed beams containing coating material micro particles in the form of single atoms and / or atomic clusters serve as a deposition source, intermittent and / or continuous deposition is conducted on a workpiece of which the free path exceeds two times or above of the minimum free path of the coating material micro particles in the mixed beams, and the surface temperature is maintained or heat is preserved to be 0.2 times or above of the coating material melting point, so that the thermal barrier coating of the high strain tolerance columnar structure with the intercolumnar pores is prepared and obtained. Compared with a traditional thermal barrier coating, the thermal barrier coating prepared through the preparation method is of the high strain tolerance columnar structure with the intercolumnar pores, the stress caused by thermal mismatch can be effectively released, and the strain tolerance is improved, so that the service life of the thermal barrier coating is prolonged.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a preparation method of a thermal barrier coating. Background technique [0002] With the rapid development of aerospace, energy power and other industries, these industries have increasingly stringent requirements for gas turbines, requiring their components to be able to serve for a long time at higher operating temperatures, and at the same time have corrosion resistance and wear resistance. The characteristics such as damage directly require that the turbine blades of the gas turbine need to have better high temperature resistance characteristics. At present, the methods for increasing the working temperature of gas turbine blades mainly include airflow cooling technology inside the blade, film cooling technology and thermal barrier coating. [0003] The thermal barrier coating has the characteristics of low longitudinal thermal conductivity and good high temperature res...

Claims

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Application Information

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IPC IPC(8): C23C14/28C23C14/08
CPCC23C14/08C23C14/083C23C14/28
Inventor 杨冠军李长久李成新章梦
Owner XI AN JIAOTONG UNIV
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