Melted CMAS-corrosion resistant rare-earth aluminate thermal barrier coating and preparation method thereof

A technology of thermal barrier coating and aluminate, which is applied in the direction of coating, fusion spraying, metal material coating process, etc., can solve the problems of melting CMAS corrosion of YSZ thermal barrier coating, and achieve excellent resistance to melting CMAS corrosion , low oxygen transmission rate, good heat insulation effect

Inactive Publication Date: 2015-10-21
BEIHANG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing YSZ thermal barrier coatings are easily corroded by molten CMAS, the present

Method used

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  • Melted CMAS-corrosion resistant rare-earth aluminate thermal barrier coating and preparation method thereof
  • Melted CMAS-corrosion resistant rare-earth aluminate thermal barrier coating and preparation method thereof
  • Melted CMAS-corrosion resistant rare-earth aluminate thermal barrier coating and preparation method thereof

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preparation example Construction

[0043] The invention provides a preparation method of a rare earth aluminate thermal barrier coating resistant to molten CMAS corrosion, comprising the following steps:

[0044] The first step is to pre-treat the surface of the substrate by sandblasting. The superalloy substrates are polished with 200#, 400#, and 600# sandpaper respectively, placed in acetone for ultrasonic cleaning for more than 15 minutes, and then the surface is pretreated by sandblasting for standby. The high-temperature alloy is selected from K3 high-temperature alloy.

[0045] The second step is to prepare NiAlDy, NiCoCrAlY or NiAlPt bonding layer on the substrate;

[0046] (A) adopt atmospheric plasma spraying method to prepare NiAlDy or NiCoCrAlY bonding layer;

[0047] Atmospheric plasma spraying method is used to prepare the bonding layer on the surface of the pretreated sample. The main process parameters are: the current is 550-700A, the voltage is 50-70V, the powder feeding rate is 10-20g / min, a...

Embodiment 1

[0070] Embodiment 1: prepare Y on the superalloy substrate surface 3 al 5 o 12 / YSZ double ceramic layer thermal barrier coating, the specific steps are as follows:

[0071] The first step is to prepare the substrate. The surface of the superalloy base material was polished with 200#, 400#, and 600# sandpaper respectively, put in acetone and ultrasonically cleaned for 15 minutes, and then the surface was pretreated by sandblasting for standby.

[0072] In the second step, a NiCoCrAlY bonding layer is prepared on the substrate;

[0073] Atmospheric plasma spraying method is used to prepare the bonding layer on the surface of the pretreated sample. The main process parameters are: the current is 650A, the voltage is 70V, the powder feeding rate is 15g / min, the spraying distance is 120mm, and the main gas flow Ar gas is 2200L / h, h 2 The air flow is 7L / min. The deposition time was 20 min, and a NiCoCrAlY bonding layer with a thickness of 90 μm was obtained.

[0074] After ...

Embodiment 2

[0080] Embodiment 2: YAlO is prepared on the surface of superalloy substrate 3 / YSZ double ceramic layer thermal barrier coating.

[0081] The material of the second ceramic layer is selected as YAlO 3 , all the other steps are with embodiment 1, make YAlO 3 / YSZ double ceramic layer thermal barrier coating.

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Abstract

The invention discloses a melted CMAS-corrosion resistant rare-earth aluminate thermal barrier coating and a preparation method thereof and belongs to the field of thermal barrier coating materials and preparation thereof. The melted CMAS-corrosion resistant rare-earth aluminate thermal barrier coating comprises a bonding layer, a first ceramic layer and a second ceramic layer which are obtained by being prepared on a matrix, wherein the first ceramic layer is a YSZ coating; the second ceramic layer is composed of garnet structure compound rare-earth aluminate or perovskite compound rare-earth aluminate; the first ceramic layer and the second ceramic layer are prepared by the adoption of methods of atmosphere plasma spraying, plasma physical vapor deposition and electron beam physical vapor deposition. According to the melted CMAS-corrosion resistant rare-earth aluminate thermal barrier coating and the preparation method thereof, the prepared rare-earth aluminate thermal barrier coating can prevent melted CMAS from permeating, and the excellent melted CMAS-corrosion resistant performance is achieved.

Description

technical field [0001] The invention relates to the technical field of high-temperature coating corrosion and protection, in particular to a rare-earth aluminate thermal barrier coating material used for melting CMAS corrosion resistance on the surface of high-temperature alloy components and a preparation method thereof. Background technique [0002] Thermal barrier coatings, referred to as TBCs, refer to the coating of high temperature resistant, corrosion resistant, high heat insulation ceramic materials on the surface of the base alloy to improve the resistance to high temperature oxidation and corrosion of the base alloy and reduce the working temperature of the alloy surface, thereby significantly improving the performance of the engine. A thermal protection technology that prolongs the life of matrix alloy components under high temperature and high stress conditions. A typical thermal barrier coating system consists of a ceramic layer, a metal bond coat and a superall...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/10
Inventor 郭洪波薛召露马岳宫声凯徐惠彬
Owner BEIHANG UNIV
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