A kind of anti-CMAS ceramic layer and preparation method thereof by slurry method

A ceramic layer and slurry technology, applied in coatings, metal material coating processes, fusion spray plating, etc., can solve problems such as thermal barrier coating erosion, and achieve uniform thickness distribution, good CMAS erosion, and high density. Effect

Active Publication Date: 2017-10-03
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the existing YSZ thermal barrier coating is easily corroded by molten CMAS, the present invention proposes a preparation method of a ceramic layer resistant to molten CMAS erosion

Method used

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  • A kind of anti-CMAS ceramic layer and preparation method thereof by slurry method
  • A kind of anti-CMAS ceramic layer and preparation method thereof by slurry method
  • A kind of anti-CMAS ceramic layer and preparation method thereof by slurry method

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preparation example Construction

[0028] The invention provides a kind of anti-CMAS ceramic layer and slurry method preparation method thereof, and described preparation method comprises the steps:

[0029] In the first step, the base body is pretreated, and a YSZ ceramic layer is prepared on the pretreated base body;

[0030] Cutting Al by wire cutting 2 o 3 Substrate and K3 superalloy substrate material to obtain 15mm×20mm×2mm Al 2 o 3 Thin slices and Φ30mm×3mm K3 high-temperature alloy discs, the cut substrate samples are polished with 400#, 600#, 800# SiC water abrasive paper in turn, and the substrate is pretreated by sandblasting to increase the surface roughness of the substrate (Ra< 2) The substrate sample pretreated by sandblasting is ultrasonically cleaned with acetone and ethanol for 10 minutes, dried, and set aside.

[0031] If using Al 2 o 3 Substrate, pre-blasted Al 2 o 3The YSZ ceramic layer is prepared on the substrate sample, the spraying power is 30-40KW, the spraying distance is 100-...

Embodiment 1

[0047] Example 1: al 2 o 3 LaPO with a thickness of 100 μm was prepared on the surface of the substrate 4 The ceramic layer, the specific steps are as follows:

[0048] In the first step, the base body is pretreated, and a YSZ ceramic layer is prepared on the pretreated base body;

[0049] Cutting Al by wire cutting 2 o 3 Base material, get 15mm×20mm×2mm Al 2 o 3 Thin slices, the cut substrate samples are polished with 400#, 600#, 800# SiC water-grinding sandpaper in turn, and the substrate is pretreated by sandblasting to increase the surface roughness of the substrate (Ra<2); The samples were ultrasonically cleaned with acetone and ethanol for 10 minutes, dried, and set aside.

[0050] Al 2 o 3 The YSZ ceramic layer was prepared on the substrate sample, the spraying power was 30KW, the spraying distance was 100mm, the powder feeding speed was 10g / min, the moving speed of the transverse plasma gun was 500μm / s, the Ar gas flow rate was 80slpm, and the H 2 The gas f...

Embodiment 2

[0056] Example 2: Preparation of 100 μm LaPO on K3 Superalloy Surface 4 The ceramic layer, the specific steps are as follows:

[0057] In the first step, the base body is pretreated, and a YSZ ceramic layer is prepared on the pretreated base body;

[0058] Cut the K3 superalloy matrix material by wire cutting to obtain a K3 superalloy disc of Φ30mm×3mm. The cut matrix samples are polished with 400#, 600#, and 800# SiC water-grinding paper in sequence, and sandblasted. Pretreatment to increase the surface roughness of the substrate (Ra < 2); the substrate sample pretreated by sandblasting is ultrasonically cleaned with acetone and ethanol for 10 minutes, dried, and set aside.

[0059] First, a NiCrAlY bonding layer was prepared on the K3 superalloy substrate sample pretreated by sandblasting using JP-5000 supersonic flame spraying equipment, and the thickness of the NiCrAlY bonding layer was 100 μm. Then adopt Metco 7M plasma spraying equipment to prepare YSZ ceramic layer,...

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Abstract

The invention discloses a CMAS-resistant ceramic layer and a preparation method thereof by a slurry method, and belongs to the field of thermal barrier coating materials and preparation thereof. The anti-CMAS ceramic layer of the present invention is a LaPO4 ceramic layer. The invention utilizes slurry method to prepare a layer of LaPO4 ceramic layer on the YSZ ceramic layer. The wettability of the LaPO4 ceramic layer to molten CMAS is poor. After heat treatment at 1250°C, a layer of mutual reaction layer is formed at the interface between the LaPO4 ceramic layer and CMAS. , effectively preventing the further infiltration of molten CMAS, and the YSZ ceramic layer maintains the original phase stability. Therefore, the LaPO4 ceramic layer prepared by the invention can prevent the infiltration of molten CMAS, has excellent CMAS corrosion resistance, and significantly improves the life of the thermal barrier coating under the coupling effect of CMAS.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coating materials and preparation thereof, and more specifically refers to preparing a thermal barrier coating ceramic layer capable of resisting CMAS erosion by using a slurry method. Background technique [0002] Thermal Barrier Coatings (TBCs for short) is one of the key technologies of advanced aero-engine hot-end components. Studies have found that in addition to high temperature, thermal fatigue and mechanical loads, the thermal barrier coating of aero-engine turbine blades will also suffer from chemical corrosion, erosion and erosion, which will eventually lead to coating failure. Among them, calcium oxide (CaO), magnesium oxide (MgO), aluminum oxide (Al 2 o 3 ), silicon dioxide (SiO 2 ) and surface deposits (CMAS) composed of trace vanadium, sulfur, sodium, and iron elements have a great influence on the thermal insulation performance and service life of TBCs. [0003] The most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89C23C24/00C23C4/134C23C4/11
Inventor 郭洪波王红宫声凯徐惠彬
Owner BEIHANG UNIV
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