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High-temperature protective coating as well as preparation method and application thereof

A protective coating, high temperature technology, applied in the field of high temperature protective coating and modified alloy coating, can solve the problems of high brittleness of NiAl coating, poor coating interface flatness, easy cracking and peeling, etc., to improve high temperature resistance. Oxidation properties, short pulse time, effect of reducing surface roughness

Pending Publication Date: 2022-03-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using the NiAl coating with oxidation resistance as the BC layer can control the growth of TGO to a certain extent and make it form a dense structure, but the NiAl coating is brittle and easy to crack and peel off
Part of the existing technology overcomes the above defects by adding metal elements to the NiAl coating, enhancing the selective oxidation of Al, and reducing the content of undesired oxides in TGO. The platinum diffusion obtained by the general electroplating heating diffusion treatment The flatness of the γ / γ' alloy coating interface is poor, and studies have shown that excessive roughness at the TC / BC interface will cause rapid growth of oxides at the peaks and a large compressive stress concentration at the troughs, making the coating If problems such as buckling and spalling failure occur, if the problem is solved by surface layer sandblasting or polishing, new problems such as material removal and process uncertainty will arise

Method used

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  • High-temperature protective coating as well as preparation method and application thereof
  • High-temperature protective coating as well as preparation method and application thereof
  • High-temperature protective coating as well as preparation method and application thereof

Examples

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preparation example Construction

[0032] According to the technical scheme of the present invention, a specific preparation method of high temperature protective coating comprises the following steps:

[0033] (1) Sandblast the surface of the nickel-based single crystal superalloy substrate with a pressure parameter of 0.2-0.3MPa, and then remove the grease, dirt and residual grit during sandblasting on the treated surface by organic solvents such as ethanol;

[0034] (2) Electroplating a pure platinum layer with a thickness of 7-12 μm on the treated substrate surface by means of electroplating;

[0035] (3) The sample is subjected to vacuum thermal diffusion treatment in a vacuum furnace to obtain the high temperature protective coating.

[0036] Among them, some further specific implementations such as:

[0037] The electroplating solution used in step (2) electroplating is [Pt(NH) 3 ) 4 ](HPO 4 ) solution, the selected current density is 0.2-0.7A / dm 2 , The pH of the electroplating solution is between ...

Embodiment 1

[0051] via as attached figure 1 The shown process prepares the protective coating, and specifically includes:

[0052] (1) Sandblasting the surface of the nickel-based single crystal superalloy substrate with a treatment parameter of 0.2-0.3MPa, and using ethanol to remove surface grease, dirt and residual grit during sandblasting;

[0053] (2) A pure platinum layer with a thickness of about 10 μm is electroplated on the surface of the treated substrate by electroplating, and the electroplating solution used is [Pt(NH) 3 ) 4 ](HPO 4 ) solution, the sample to be plated is used as the negative electrode, the titanium mesh is used as the positive electrode, and the current density during electroplating is 0.5A / dm 2 , The pH of the electroplating solution is adjusted by KOH solution and kept between 10.3-10.6;

[0054] (3) The sample is subjected to vacuum thermal diffusion treatment in a vacuum furnace. The treatment conditions are that the vacuum furnace is kept at 1100 °C f...

Embodiment 2

[0063] The difference between this example and Example 1 is the number of pulses processed by the high-current pulse e-book, and the preparation process is as follows:

[0064] (1) Sandblasting the surface of the nickel-based single crystal superalloy substrate with a treatment parameter of 0.2-0.3MPa, and using ethanol to remove surface grease, dirt and residual grit during sandblasting;

[0065] (2) A pure platinum layer with a thickness of about 10 μm is electroplated on the surface of the treated substrate by electroplating, and the electroplating solution used is [Pt(NH) 3 ) 4 ](HPO 4 ) solution, the sample to be plated is used as the negative electrode, the titanium mesh is used as the positive electrode, and the current density during electroplating is 0.5A / dm 2 , The pH of the electroplating solution is adjusted by KOH solution and kept between 10.3-10.6;

[0066] (3) The sample is subjected to vacuum thermal diffusion treatment in a vacuum furnace. The treatment co...

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Abstract

The invention discloses a high-temperature protective coating as well as a preparation method and application thereof, and the preparation method comprises the following steps: carrying out surface pretreatment on a substrate material of a nickel-based single-crystal high-temperature alloy, carrying out electroplating treatment to obtain a pure platinum coating on the surface of the substrate, and carrying out vacuum thermal diffusion treatment to obtain a composite coating, and the composite coating is subjected to surface high-current pulse electron beam treatment, and the high-temperature protective coating is obtained. According to the method, the platinum diffusion gamma / gamma'alloy coating with high oxidation resistance and a flat surface can be obtained.

Description

technical field [0001] The present invention relates to the technical field of high temperature protective coatings, in particular to the technical field of modified alloy coatings. Background technique [0002] Thermal barrier coatings (TBCs) can effectively improve the oxidation resistance of alloy substrates in high temperature environments, so they are widely used in high temperature components of aero-engines. Thermal barrier coatings are generally composed of a ceramic layer (TC) with thermal insulation properties and a metal bonding layer (BC) with high temperature oxidation resistance. During high temperature service, thermally grown oxides ( TGO), if TGO is continuous and dense, it can effectively prevent the diffusion of external oxygen elements and significantly improve the high temperature oxidation resistance of TBC. [0003] Using the NiAl coating with oxidation resistance as the BC layer can control the growth of TGO to a certain extent and make it form a den...

Claims

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Application Information

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IPC IPC(8): C25D5/50C25D3/50
CPCC25D5/50C25D3/50C25D5/505C25D5/605C25D5/615
Inventor 尹冰冰孙妙谢志航杨熠何志伟沈凤霞
Owner XIANGTAN UNIV