Self-healing environmental barrier coating on member surface and preparation method thereof

A coating and capability technology, applied in the field of environmental barrier coatings and preparations with self-healing ability on the surface of components, can solve the problems of corrosion of CMC-SiC parts, loss of EBC protection of CMC-SiC, etc., to improve crack resistance, The effect of prolonging service time

Inactive Publication Date: 2014-08-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, corrosive media such as water vapor, oxygen, and molten salt impurities in the gas environment will rapidly diffuse into the CMC-SiC through these cracks, causing corrosion to the CMC-SiC components and causing the EBC to lose the ability to protect the CMC-SiC. effect

Method used

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  • Self-healing environmental barrier coating on member surface and preparation method thereof
  • Self-healing environmental barrier coating on member surface and preparation method thereof
  • Self-healing environmental barrier coating on member surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: prepare BSAS+Y with brushing sintering method 2 Si 2 o 7 -Self-healing EBC of titanium silicide

[0032] Concrete preparation steps are as follows:

[0033] 1. Preparation of silicon carbide bonding layer: select continuous carbon fiber reinforced silicon carbide ceramic matrix composite (C f / SiC) as the matrix, the C f / SiC is made into a strip sample with a size of 40×5×3.5mm, which is cleaned by ultrasonic waves. A dense silicon carbide bonding layer was prepared on the surface of the sample by chemical vapor deposition (CVD). Using a scanning electron microscope (SEM), measure the thickness of the bonding layer, as figure 1 shown. In this embodiment, the adhesive layer has a thickness of 30 μm.

[0034] 2. Preparation of BSAS+Y 2 Si 2 o 7 -Self-healing EBC of titanium silicide and EBC of the same system without additives:

[0035] 1) The BSAS (Ba 0.5 Sr 0.5 al 2 Si 2 o 8 ) powder and Y 2 Si2 o 7 Powder, add 1.5-2 times the mass of a...

Embodiment 2

[0045] Example 2: Preparation of BSAS-molybdenum disilicide self-healing EBC by pulling method

[0046] Concrete preparation steps are as follows:

[0047] 1. Preparation of silicon carbide bonding layer: select continuous carbon fiber reinforced silicon carbide ceramic matrix composite (C f / SiC), the C f / SiC is made into a strip sample with a size of 40×5×3.5mm, which is cleaned by ultrasonic waves. A dense silicon carbide bonding layer was prepared on the surface of the sample by chemical vapor deposition (CVD). Using a scanning electron microscope (SEM), the thickness of the adhesive layer was measured. In this example, the thickness of the adhesive layer was 30 μm.

[0048] 2. Preparation of BSAS-molybdenum disilicide self-healing EBC and EBC of the same system without additives:

[0049] 1) The BSAS (Ba 0.5 Sr 0.5 al 2 Si 2 o 8 ) powder is added to 1.5-2 times the mass of alcohol solution, and 10%-20% mass ratio of molybdenum disilicide (MoSi 2 ) powder, addin...

Embodiment 3

[0059] Embodiment 3: adopt plasma spraying method to prepare Y 2 Si 2 o 7 - Chromium Disilicide Self-healing EBC

[0060] The preparation process and performance assessment methods are the same as in Examples 1 and 2. In this example, C f / SiC uses silicon carbide (thickness 30μm) as the bonding layer; at the same time, Y 2 Si 2 o 7 - The thickness of the self-healing EBC of chromium disilicide and the EBC of the same system without additives are both 50 μm. This method is to prepare the coating by plasma spraying method. What is different from Examples 1 and 2 is that this preparation method is a one-time preparation coating. layer. Pass the test to get Y 2 Si 2 o 7 -The self-healing EBC of chromium disilicide and the EBC strength and mass retention rate of the same system without additives vary with the time of water and oxygen, and the surface and cross-sectional morphology of the coating are obtained under the scanning electron microscope. 2 Si 2 o 7 -The surf...

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Abstract

The invention relates to a self-healing environmental barrier coating on the member surface and a preparation method thereof. The theory basis is that: when silicide is added into present EBC, if cracks appear in coating used in a combustion gas environment, silicide on the crack surface or near the crack will be rapidly oxidized to generate silicon dioxide (SiO2) or another oxide, thus the SiO2 can be used as a mobile phase to seal the cracks; furthermore, the volume expansion caused by the oxidation reactions and the high expansion coefficient of the silicide generate pressure stress on the cracks to accelerate the healing of the cracks; so the prepared environmental barrier coating has a good self-healing ability.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to an environmental barrier coating with self-healing ability on the surface of components and a preparation method. Background technique [0002] Continuous fiber toughened silicon carbide ceramic matrix composites (CMC-SiC, including SiC f / SiC and C f / SiC) has the characteristics of high specific strength, high specific modulus, oxidation resistance and low density, and has become an ideal candidate material for aero-engine hot-end parts. In a dry air environment, a layer of SiO will form on the surface of CMC-SiC 2 Protective film, so that it has good oxidation resistance in dry air environment. However, water vapor, oxygen and molten salt impurities (such as: Na 2 SO 4 etc.) and other corrosive media will affect SiO 2 The protective film causes corrosion, making the SiO 2 The protective film loses its protective effect on the internal CMC-SiC, resulting in a sharp d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
Inventor 王一光叶乔陆永洪张立同成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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