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Novel preparation process for thermal barrier coating

A technology of thermal barrier coating and preparation process, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., to achieve the effect of improving density and selective oxidation ability

Active Publication Date: 2019-06-25
江苏源清动力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of this process is often a quarter of the replacement cost of hot end components

Method used

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  • Novel preparation process for thermal barrier coating
  • Novel preparation process for thermal barrier coating
  • Novel preparation process for thermal barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1. Generate a composite metal bond primer on the surface of the substrate. Specifically include:

[0052] Step 11. Prepare a first metal bonding primer layer of about 50 μm on the surface of the substrate by a supersonic flame spraying process.

[0053] Step 12. Prepare a second metal bonding primer layer of about 50 μm on the surface of the substrate by a supersonic flame spraying process.

[0054] Both the first metal bond primer and the second metal bond primer were made of MCrAlY powder. The second metallic bond primer has a greater aluminum content than the first metallic bond primer.

[0055] Step 13. Vacuum diffusion heat treatment. Interdiffusion occurs between the first metal bonding primer and the second metal bonding primer, forming a layer on the surface consisting of an outer sublayer that is relatively aluminum-rich and has a higher elastic modulus and an inner layer that is relatively chromium-rich and has a lower elastic modulus Composite metal ...

Embodiment 2

[0061] Step 1. Generate a composite metal bond primer on the surface of the substrate. Specifically include:

[0062] Step 11. Prepare a first metal bonding primer layer with a thickness of about 100 μm on the surface of the substrate by a supersonic flame spraying process.

[0063] Step 12. Prepare a second metal bonding primer with a thickness of about 100 μm on the surface of the substrate by a supersonic flame spraying process.

[0064] Both the first metal bond primer and the second metal bond primer were made of MCrAlY powder. The second metallic bond primer has a greater aluminum content than the first metallic bond primer.

[0065] Step 13. Vacuum diffusion heat treatment. Interdiffusion occurs between the first metal bonding primer and the second metal bonding primer, forming a layer on the surface consisting of an outer sublayer that is relatively aluminum-rich and has a higher elastic modulus and an inner layer that is relatively chromium-rich and has a lower ela...

Embodiment 3

[0071] Step 1. Generate a composite metal bond primer on the surface of the substrate. Specifically include:

[0072] Step 11. Prepare a first metal bonding primer layer with a thickness of about 150 μm on the surface of the substrate by a supersonic flame spraying process.

[0073] Step 12. Prepare a second metal bonding primer with a thickness of about 150 μm on the surface of the substrate by a supersonic flame spraying process.

[0074] Both the first metal bond primer and the second metal bond primer were made of MCrAlY powder. The second metallic bond primer has a greater aluminum content than the first metallic bond primer.

[0075] Step 13. Vacuum diffusion heat treatment. Interdiffusion occurs between the first metal bonding primer and the second metal bonding primer, forming a layer on the surface consisting of an outer sublayer that is relatively aluminum-rich and has a higher elastic modulus and an inner layer that is relatively chromium-rich and has a lower ela...

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Abstract

The invention relates to a novel preparation process for a thermal barrier coating. The novel preparation process comprises the following steps: generating a metal bonding bottom layer on the surfaceof a matrix; generating an in-situ thermal growth oxide layer (TGO); and generating a ceramic heat-insulating surface layer, wherein the TGO layer is pre-grown before the matrix serves. The TGO layercomprises alpha-aluminum oxide. A compact and continuous TGO layer which takes alpha-aluminum oxide as the principal component is preset through large-particle dry ice jetting and purifying rougheningtreatment and pre-vacuum argon gas oxidizing treatment. An oxide film has very good high-temperature oxidization resistance, prevents quick oxidization, reduces a layer thickness increase rate of theTGO layer, and achieves the purpose of reducing thermal barrier coating peel-off probability.

Description

technical field [0001] The invention relates to the field of thermal barrier coatings, in particular to a novel preparation process of thermal barrier coatings. Background technique [0002] A gas turbine is a well-developed and widely used mechanical device that converts the chemical energy of fuel into heat and mechanical energy to drive equipment or facilities such as jet aircraft, large ships, generator sets, and fluid pumps. In order to improve energy utilization efficiency, the metal materials used for the hot end parts of gas turbines are often close to or reach the critical state of their thermal stability when the equipment is working, that is, in order to improve the efficiency of gas turbines, the temperature of the turbine inlet is greatly increased. In fact, the first stage moving and guide vanes of advanced gas turbines are often in a mixed gas atmosphere higher than their melting point when they work. Only because the surface of the metal material is isolated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/073C23C4/18C23C4/134C23C4/11
Inventor 于大千钱原吉冯泽林
Owner 江苏源清动力技术有限公司
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