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A New Preparation Technology of Thermal Barrier Coating

A technology of thermal barrier coating and preparation process, which is used in metal material coating process, coating, melt spraying and other directions

Active Publication Date: 2021-08-27
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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  • A New Preparation Technology of Thermal Barrier Coating
  • A New Preparation Technology of Thermal Barrier Coating
  • A New Preparation Technology of 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 thermal barrier coating preparation process, which comprises the following steps: forming a metal bonded underlayer on the surface of a substrate; forming an in-situ thermally grown oxide layer (TGO); and forming a ceramic heat-insulating surface layer. The TGO layer is pre-grown before the substrate is put into service. The composition of the TGO layer includes alpha-alumina. In the present invention, a layer of dense and continuous TGO layer mainly composed of α-alumina is preset through large-particle dry ice jet purification and roughening treatment and pre-vacuum argon oxidation treatment. The oxide film will have good resistance to high temperature oxidation, prevent rapid oxidation, reduce the growth rate of TGO layer thickness, and achieve the purpose of reducing the occurrence probability of thermal barrier coating peeling.

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 Patents(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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