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Multilayer composite environmental barrier coating with crack self-healing function and preparation method thereof

A multi-layer composite, self-healing technology, applied in the field of materials, can solve problems such as failure, delamination of the coating, and reduction of the bonding between the coating and the substrate.

Active Publication Date: 2020-03-31
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water and oxygen atmosphere enters the bottom of the coating along the penetrating cracks, corrodes the underlying coating and the substrate, and forms holes, which reduces the bonding between the coating and the substrate, resulting in the delamination of the coating, resulting in failure

Method used

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  • Multilayer composite environmental barrier coating with crack self-healing function and preparation method thereof
  • Multilayer composite environmental barrier coating with crack self-healing function and preparation method thereof
  • Multilayer composite environmental barrier coating with crack self-healing function and preparation method thereof

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preparation example Construction

[0027] Such as figure 1 As shown, a method for preparing a multilayer composite environmental barrier coating with crack self-healing function according to an embodiment of the present invention includes the following steps:

[0028] S101: Prepare an adhesive layer on the base material. The base material can choose silicon-based ceramics. Silicon-based ceramics and their composite materials have excellent characteristics such as low density, high strength, good high temperature stability, oxidation resistance and good mechanical properties under high temperature conditions, making them suitable for high temperature applications in aero-engines. It has a good application prospect on hot-end parts, so it has attracted extensive attention. Si is selected as the bonding layer, and the function of the silicon bonding layer is mainly to combine the base material and the intermediate layer together to further enhance the adhesion between the oxygen barrier layer and the base materia...

Embodiment 1

[0048] Embodiment 1 provides a kind of preparation process of SiC / SiC composite material coating, adopts the method for plasma spraying to prepare adhesive layer, adhesive layer material selects silicon; Select the method for sol-gel to prepare oxygen barrier layer, oxygen barrier layer The material is mullite (3Al 2 o 3 2SiO2 2 ); The self-healing sealing layer is prepared by the slurry method, and the material of the self-healing sealing layer is BSAS-SiO 2 Eutectic alloy; the method of plasma spraying is used to prepare the anti-water and oxygen corrosion layer, and the material of the anti-water and oxygen corrosion layer is BSAS. Concrete preparation steps are as follows:

[0049] 1. Select SiC / SiC composite material as the base material, and use the method of plasma spraying to spray elemental silicon on the base material, and the coating thickness is 20 μm to 50 μm.

[0050] 2. Material preparation and coating preparation of the oxygen barrier layer

[0051]1) Alum...

Embodiment 2

[0065] The water-oxygen corrosion performance assessment of the EBC coating prepared in Example 1 was carried out. The assessment conditions are: the temperature in the furnace is 1300 ° C, the atmosphere is 50% H 2 O-50%O 2 , the total air pressure is 1atm, the air velocity is 4.4cm / s, and the total duration is 300h. Measure the sample weight at 0, 5h, 10h, 25h, 50h, 100h, 150h, 200h, 250h, 300h respectively.

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Abstract

The present invention relates to a multilayer composite environment barrier coating having a crack self-healing function, and a preparation method thereof. The preparation method comprises: S101, preparing an adhesion layer on a substrate; S102, preparing an oxygen barrier layer on the adhesion layer; S103, preparing a self-healing sealing layer on the oxygen barrier layer; and S104, preparing a water-oxygen-corrosion-resistant layer on the self-healing sealing layer, wherein the material of the self-healing sealing layer is a BSAS-SiO2 eutectic alloy. According to the present invention, with the multilayer composite environment barrier coating having the crack self-healing function, the occurrence of the penetrating cracks can be effectively prevented, the substrate can be protected from corrosion caused by water oxygen atmosphere, and the service life of the environment barrier coating can be prolonged.

Description

technical field [0001] The invention relates to the field of materials, in particular to a multilayer composite environmental barrier coating with crack self-healing function and a preparation method thereof. Background technique [0002] Silicon-based ceramics and their composite materials have excellent characteristics such as low density, high strength, good high-temperature stability and oxidation resistance, and good mechanical properties under high-temperature conditions, making them suitable for high-temperature hot-end parts of aero-engines. prospects, and thus received widespread attention. Studies have shown that silicon-based ceramics and their composites exhibit excellent high-temperature stability and good mechanical properties in a dry environment, but their high-temperature performance decays severely in a water-oxygen atmosphere, especially in high-temperature, high-speed combustion, and high-speed airflow. flushed engine operating conditions. This is becau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/14C04B35/565C04B41/5096C04B41/5024C04B41/4537C04B41/5022C04B41/5025
Inventor 罗瑞盈王连毅
Owner BEIHANG UNIV
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