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Multilayer thermal barrier coating and preparation method thereof

A technology of thermal barrier coatings and ceramic layers, applied in coatings, chemical instruments and methods, metal material coating processes, etc., can solve problems such as poor corrosion resistance, failure of thermal barrier coatings, low thermal shock resistance, etc. question

Inactive Publication Date: 2011-07-20
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the problem of layer-by-layer peeling failure and poor corrosion resistance of the double ceramic layer thermal barrier coating during the thermal cycle, as well as the technical problem of low thermal shock resistance of the thermal barrier coating prepared by conventional plasma spraying technology

Method used

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  • Multilayer thermal barrier coating and preparation method thereof
  • Multilayer thermal barrier coating and preparation method thereof
  • Multilayer thermal barrier coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Example 1 : 8YSZ / La prepared by electron beam physical vapor deposition method 2 Ce 2 o 7 / Al 2 o 3 Multi-layer thermal barrier coating.

[0113] Step 1: Deposit the bonding layer, the first ceramic layer and the second ceramic layer on the surface of the substrate:

[0114] (1) Preparation of target material:

[0115] A: Preparation of bonding layer material target:

[0116] NiCrAlY alloy is selected as the material of the bonding layer, and the composition weight percentage is 73% Ni, 19% Cr, 7% Al, 1% Y, and is melted at 1400°C to obtain the bonding layer material target.

[0117] B: Prepare the first ceramic layer and the second ceramic layer material targets:

[0118] The first ceramic layer material powder 8YSZ and the second ceramic layer material powder La 2 Ce 2 o 7 Cold-press forming to obtain a cylindrical rod, and the cold-press-formed rod is kept in a high-temperature furnace at 1300°C for 24 hours to obtain a dense ceramic rod, as the first cer...

Embodiment 2

[0134] Example 2 : 8YSZ / La prepared by electron beam physical vapor deposition method 2 Ce 2 o 7 / Al 2 o 3 Multi-layer thermal barrier coating.

[0135] Step 1: Deposit the bonding layer, the first ceramic layer and the second ceramic layer on the surface of the substrate:

[0136] (1) Preparation of target material:

[0137] A: Preparation of bonding layer material target:

[0138] NiCrAlYHf alloy is selected as the material of the bonding layer, and the component weight percentage is 64% Ni, 24% Cr, 10% Al, 1.5% Y, 0.5% Hf, and is melted at 1600°C to obtain the bonding layer material target.

[0139] B: Prepare the first ceramic layer and the second ceramic layer material targets:

[0140] The first ceramic layer material powder 8YSZ and the second ceramic layer material powder La 2 Ce 2 o 7 Cold-press forming to obtain a cylindrical rod, and the cold-press-formed rod is kept in a high-temperature furnace at 1400°C for 12 hours to obtain a dense ceramic rod, whic...

Embodiment 3

[0156] Example 3 : 8YSZ / La prepared by electron beam physical vapor deposition method 2 Ce 2 o 7 / Al 2 o 3 Multi-layer thermal barrier coating.

[0157] The difference between this embodiment and embodiment 2 is only in step one (3), (4) and step two (2)

[0158] Step 1: (3) depositing the bonding layer:

[0159] A bonding layer is deposited on the surface of the substrate. Evacuate the vacuum chamber to the required vacuum degree of 5×10 -4 Pa, during the deposition process, the substrate temperature is 900° C., the substrate rotation speed is 15 rpm, the deposition rate is 1.5 μm / min, and the deposition time is 42 minutes. After the deposition is completed, take it out, put it into a vacuum heat treatment furnace for heat treatment for 3 hours, and the vacuum degree is 5×10 -4 Pa, the heat treatment temperature is 1050°C. Shot blasting is performed on the samples with adhesive layer deposited after heat treatment, and then ultrasonically cleaned with acetone;

[...

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Abstract

The invention provides a multilayer thermal barrier coating and a preparation method thereof. The multilayer thermal barrier coating sequentially comprises an adhesion layer, a first ceramic layer, a second ceramic layer and a closing layer from bottom to top, wherein the closing layer has the thickness of 10-30 micros and the porosity of 2-8 percent and is made from the Al2O3. The thermal barrier coating can be prepared by adopting an electron beam physical gas-phase deposition technology or a plasma spraying method. The multilayer thermal barrier coating provided by the invention can avoid the stripping of the ceramic layers in a thermal circulating process, the thermal erosion resistance of the thermal barrier coating is greatly improved than the dual ceramic layers; and vertical crackles are introduced in the ceramic layer through improving a conventional plasma spraying process so that the thermal shock life of the thermal barrier coating is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a multilayer thermal barrier coating and a preparation method thereof. Background technique [0002] Increasing the inlet temperature before the turbine of an aero-engine can improve the thrust of the engine and the thermal efficiency of the fuel. The design inlet temperature of an aero-engine with a push ratio of 10 is above 1577°C, and that of an aero-engine with a push ratio of 15 or above is above 1727°C. Currently, the most advanced The temperature bearing capacity of the advanced nickel-based alloy blades is below 1100°C, coupled with advanced film cooling technology (the maximum surface temperature of the workpiece can be reduced by 400°C), only compared to the thrust ratio of 10 aircraft engines, there are still 100-200°C Temperature differences need to be overcome. However, while the advanced air film cooling technology reduces the surface temperature of the blade, it ...

Claims

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Application Information

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IPC IPC(8): C23C14/30C23C4/12B32B9/04B32B18/00C23C4/073C23C4/11C23C4/134
CPCY02T50/60
Inventor 郭洪波郭磊宫声凯徐惠彬
Owner BEIHANG UNIV
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