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Anti-oxidization thermal barrier coating material with long service life and preparation method thereof

A thermal barrier coating and oxidation-resistant technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of easy cracking, difficulty in obtaining, warping and falling off of the coating, and achieve enhanced interface bonding Strength, improve service life, effect of tissue refinement

Inactive Publication Date: 2014-05-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems in the background technology, the present invention proposes a high-life oxidation-resistant thermal barrier coating material and its preparation method; through structural design and preparation method design, it solves the problem of the bonding layer when the ion spraying method is used to prepare the coating The surface is loose and porous, and it is difficult to obtain a continuous and dense TGO protective film at the interface, which leads to problems such as cracking, warping and peeling off of the coating. It has strong high temperature oxidation resistance, improves thermal efficiency, and prolongs service life.

Method used

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  • Anti-oxidization thermal barrier coating material with long service life and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Preparation of thermal barrier coating:

[0033] S1. Carry out pre-grinding, cleaning, and sandblasting roughening treatment on the superalloy substrate; according to the technical requirements of the sandblasting equipment, the sandblasting material is 60 mesh white corundum, the pressure is 0.4MPa, and the sandblasting distance is 120mm.

[0034] S2. Deposit a metal bonding layer Co23Cr13Al0.5Y on the surface of the roughened superalloy substrate by atmospheric plasma spraying to complete the preparation of the metal bonding layer. The thickness of the bonding layer is 160 μm; according to the requirements of atmospheric plasma spraying equipment, select The selected voltage is 38V, the current is 750A, the speed of the spray gun is 450mm / s, and the spraying distance is 85mm.

[0035] S3. Perform HCPEB bombardment treatment on the prepared metal bonding layer to complete the preparation of the fine-grain remelted layer; select the electron beam energy as 27KeV and...

Embodiment 2

[0046] Same as Example 1, only change the electron beam parameters in step S3, select the electron beam energy as 21.6, 23.4 and 27KeV according to the technical requirements of HCPEB equipment, and the energy density is 4J / cm 2 , 30 irradiation treatments were performed on the metal bonding layer.

[0047] SEM observation of the thermal barrier coating cross-section. The results show that after bombardment with different pulse energies, the thickness of the remelted layer at the interface increases with the increase of the bombardment energy, the interface between the remelted layer and the ceramic layer is well bonded, and no microscopic defects such as holes and cracks appear.

[0048] The high temperature oxygen oxidation resistance of thermal barrier coatings was tested. Static oxidation experiments at 1050°C show that at the interface between the ceramic layer and the remelted layer, TGO is a continuous uniform and dense oxide film structure, and the thickness of TGO de...

Embodiment 3

[0051] Same as in Example 1, only the composition of the metal bonding layer in step S2 is changed, and the metal bonding layer Ni21Co32Cr8Al0.5Y is deposited on the surface of the roughened superalloy substrate by atmospheric plasma spraying to complete the preparation of the metal bonding layer.

[0052] SEM observation of the thermal barrier coating cross-section. The results show that after bombardment with different pulse times, the thickness of the remelted layer at the interface increases with the increase of the number of bombardments, the interface between the remelted layer and the ceramic layer is well bonded, and no microscopic defects such as holes and cracks appear.

[0053] The high temperature oxygen oxidation resistance of thermal barrier coatings was tested. Static oxidation experiments at 1050°C show that at the interface between the ceramic layer and the remelted layer, TGO is a continuous, uniform and dense oxide film structure, with only a small amount of...

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Abstract

The invention belongs to the technical field of thermal barrier coating surface treatment and modification, and in particular relates to an anti-oxidization thermal barrier coating material with long service life and a preparation method thereof. The coating material comprises a high-temperature alloy substrate, a metal adhesive layer, a fine-grain remelted layer and a ceramic surface layer. The invention also discloses the preparation method of the anti-oxidization thermal barrier coating material with long service life; the preparation method comprises the steps of depositing the metal adhesive layer on the surface layer of the high-temperature alloy substrate by a plasma spraying method after pre-grinding, cleaning and sand-blasting roughening treatment, and then performing remelting treatment on the metal adhesive layer with a high-current pulse electron beam device, performing sand-blasting treatment on the outmost surface layer of the remelted layer, and finally, depositing the ceramic surface layer on the surface layer of the remelted layer by the plasma spraying method. The anti-oxidization thermal barrier coating material with long service life prepared by the preparation method is high in interface bonding force and even in structural constituents, and has stable oxidization resistance and long coating service life in high-temperature service environment.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coating surface treatment and modification, and in particular relates to a high-life oxidation-resistant thermal barrier coating material and a preparation method thereof. Background technique [0002] With the rapid development of aerospace technology, the gas inlet temperature and efficiency of turbine engines continue to increase, but the existing high-temperature alloys and cooling technology can no longer meet this demand. The most effective, economical and feasible method in the world is Spray thermal barrier coatings (TBCs) materials with high-temperature oxidation and heat insulation functions on the workpiece to protect high-temperature components such as blades from high-temperature erosion, increase the power of gas turbines, and prolong the service life of the engine. [0003] TBCs is a thermal protection system composed of ceramic oxide and an intermediate layer with high-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/18C23C4/08C23C4/10C23C4/073C23C4/11C23C4/134
Inventor 关庆丰蔡杰杨盛志侯秀丽王晓彤李艳
Owner JIANGSU UNIV
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