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Environmental barrier coating used for ceramic base composite material matrix, and making method thereof

A technology of environmental barrier coatings and composite materials, which is applied in the field of high-temperature coating preparation of aero-engines and ground gas turbines, can solve problems such as short working hours, inability to meet the requirements of long-term high-temperature environments, and inability to meet long-life work requirements. Evaporation rate, elimination of spalling and cracking, and good erosion resistance

Active Publication Date: 2016-03-09
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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AI Technical Summary

Problems solved by technology

Beijing Aeronautical Manufacturing Engineering Research Institute prepared SiC / MoSi on the surface of C / SiC composite materials 2 Composite coating has good long-term anti-oxidation effect in static air at 1300°C; BSAS prepared by Northwestern Polytechnical University by slurry sintering method has good protection performance at 1250°C; Central South University prepared SiC, HfC, High-temperature anti-oxidation coatings such as ZrC have been successfully applied in the aerospace field. The coating has good bonding strength and can be used in a high-temperature ablation environment of 1500°C and above in a short period of time. The disadvantage is that the working time is short and cannot meet the long-life working requirements.
[0008] It can be seen that the existing environmental barrier coatings generally adopt a single-layer or double-layer structure, and the coating materials are mainly SiC, HfC, BSAS or mullite materials, which have good high-temperature oxidation resistance in a short period of time, but cannot be used for a long time. High temperature environment requirements

Method used

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  • Environmental barrier coating used for ceramic base composite material matrix, and making method thereof

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Effect test

Embodiment 1

[0035] This embodiment provides a kind of environmental barrier coating for ceramic matrix composite material matrix (structural schematic diagram sees figure 1 ), the bottom layer material used when preparing the coating is SiC; the surface layer is a composite layer, the composite layer is made of yttrium silicate and mullite materials, and the chemical purity is 99.5%, and the powder particle size is 100-200 mesh Mollite. Come stone powder; the chemical purity is 99.448%, and the powder particle size is 100-200 mesh yttrium silicate powder.

[0036] The preparation process of the coating is:

[0037] 1. Use chemical vapor deposition technology to prepare SiC coating on the ceramic matrix composite material substrate as the bottom layer, and the thickness is controlled at about 100 μm.

[0038] 2. Use plasma spraying technology to spray the surface layer on the bottom layer, which is a composite layer; the plasma spraying power is 30kW, and the spraying distance is 80mm;

...

Embodiment 2

[0045] This embodiment provides a kind of environmental barrier coating that is used for the substrate of ceramic matrix composite material, and the base material that selects when preparing coating is SiC; Surface layer is composite layer, and this composite layer is made of yttrium silicate, mullite material In the process, respectively use mullite powder with a chemical purity of 99.5% and a powder particle size of 100-200 mesh; chemical purity of 99.448% and a powder particle size of yttrium silicate powder of 100-200 mesh.

[0046] The preparation process of the coating is:

[0047] 1. Use chemical vapor deposition technology to prepare SiC coating on the ceramic matrix composite material substrate as the bottom layer, and the thickness is controlled at about 100 μm.

[0048] 2. Use plasma spraying technology to spray the surface layer on the bottom layer, which is a composite layer; the plasma spraying power is 35kW, and the spraying distance is 90mm;

[0049] The speci...

Embodiment 3

[0056] This embodiment provides a kind of environmental barrier coating that is used for the substrate of ceramic matrix composite material, and the base material that selects when preparing coating is SiC; Surface layer is composite layer, and this composite layer is made of yttrium silicate, mullite material In the process, respectively use mullite powder with a chemical purity of 99.5% and a powder particle size of 100-200 mesh; chemical purity of 99.448% and a powder particle size of yttrium silicate powder of 100-200 mesh.

[0057] The preparation process of the coating is:

[0058] 1. Use chemical vapor deposition technology to prepare SiC coating on the ceramic matrix composite material substrate as the bottom layer, and the thickness is controlled at about 100 μm.

[0059] 2. Use plasma spraying technology to spray the surface layer on the bottom layer, which is a composite layer; the plasma spraying power is 35kW, and the spraying distance is 90mm;

[0060] The speci...

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Abstract

The invention provides an environmental barrier coating used for a ceramic base composite material matrix, and a making method thereof. The base layer of the environmental barrier coating selects a chemical vapor deposited SiC coating (transition layer), and the surface layer of the environmental barrier coating selects a plasma sprayed yttrium silicate and / or mullite coating. The SiC base layer and the ceramic base composite material matrix have extremely approaching thermal expansion coefficients, so cracking and spalling of the coating from the matrix are avoided; and the surface layer material selects a yttrium silicate doped mullite material, so the specific gravity of a mullite powder material is gradually increased from inside to outside; the yttrium silicate material has strong combination force with SiC, is matched with SiC in the thermal expansion coefficient, and also has the characteristics of low volatility and low oxygen permeability, so failure of the coating, caused by cracking of a base layer-surface layer interface, is avoided; and the mullite material has the advantages of good scouring resistance and high thermal stability, and can work in high temperature environment.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature coatings for aero-engines and ground gas turbines, and in particular relates to an environmental barrier coating used for ceramic matrix composite material substrates and a preparation method. Background technique [0002] Environmental barrier coating (EBC), also known as high-temperature anti-oxidation coating, is a thermal protective coating for engine hot-end parts that can protect the ceramic matrix composite matrix and avoid oxidation. In order to further reduce the weight of aero-engines and gas turbines, simplify the structure, improve fuel efficiency, and the operating temperature of hot-end components, ceramic matrix composites have attracted widespread attention due to their high temperature resistance, high strength, low density, and corrosion resistance. Aviation high temperature structural materials. However, in the engine working environment, the surface sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/52C04B41/89
Inventor 王纯周海滨李其连靳磊
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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