Environmental protection coating of SiCf/SiC composite material guider blade and preparation method of environmental protection coating

A composite material and protective coating technology, which is applied in the direction of metal material coating process, coating, mechanical equipment, etc., can solve the problem that the environmental protection coating cannot be used for a long time, and achieve a wide range of temperature applications, wide adjustable range, Effect of Preventing Amorphous Reaction

Inactive Publication Date: 2017-10-27
PLA NO 5719 FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a SiC f The preparation method of the environmental protection coati

Method used

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  • Environmental protection coating of SiCf/SiC composite material guider blade and preparation method of environmental protection coating
  • Environmental protection coating of SiCf/SiC composite material guider blade and preparation method of environmental protection coating
  • Environmental protection coating of SiCf/SiC composite material guider blade and preparation method of environmental protection coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A certain type of aero-engine SiC f / SiC composite deflector vane 5 with a length of 600 mm, a width of 200 mm, and a thickness of 10 mm. Adopt the method provided by the invention to prepare Si bonding layer 4 / mullite transition layer 3 / Yb 2 SiO 5 Environmental barrier layer 2 / La 2Zr 2 o 7 Thermal barrier layer 1, the coating is composed of bonding layer, transition layer, environmental barrier layer and thermal barrier layer, all using PS-PVD equipment. First, the substrate is preheated with a spray gun, and the preheating temperature is 1000°C, and then the coating is prepared according to the following four steps.

[0028] Step 1: Preparation of Si Adhesive Layer 4

[0029] The powder raw material is high-purity silicon powder, the purity is 99.99%, and the powder particle size is 5-38 μm; the spraying speed is 1000 mm / s, spraying 5 times, and the coating thickness reaches 20 μm; the spraying process parameters of the Si bonding layer are: the vacuum degree is...

Embodiment 2

[0037] A certain type of aero-engine SiC f / SiC composite deflector vane 5 with a length of 600 mm, a width of 200 mm, and a thickness of 10 mm. Adopt the method provided by the invention to prepare Si bonding layer 4 / mullite transition layer 3 / Yb 2 SiO 5 Environmental barrier layer 2 / La 2 Zr 2 o 7 Thermal barrier layer 1, the coating is composed of bonding layer, transition layer, environmental barrier layer and thermal barrier layer, all using PS-PVD equipment. First, the substrate is preheated with a spray gun, and the preheating temperature is 1090°C, and then the coating is prepared according to the following four steps.

[0038] Step 1: Preparation of Si Adhesive Layer 4

[0039] The powder raw material is high-purity silicon powder, the purity is 99.99%, and the powder particle size is 5-38 μm; the spraying speed is 1000 mm / s, spraying 7 times, and the coating thickness reaches 50 μm; the spraying process parameters of the Si bonding layer are: the vacuum degree i...

Embodiment 3

[0047] A certain type of aero-engine SiC f / SiC composite deflector vane 5 with a length of 600 mm, a width of 200 mm, and a thickness of 10 mm. Adopt the method provided by the invention to prepare Si bonding layer 4 / mullite transition layer 3 / Yb 2 SiO 5 Environmental barrier layer 2 / La 2 Zr 2 o 7 Thermal barrier layer 1, the coating is composed of bonding layer, transition layer, environmental barrier layer and thermal barrier layer, all using PS-PVD equipment. First, the substrate is preheated with a spray gun, and the preheating temperature is 1200°C, and then the coating is prepared according to the following four steps.

[0048] Step 1: Preparation of Si Adhesive Layer 4

[0049] The powder raw material is high-purity silicon powder, the purity is 99.99%, and the powder particle size is 5-38 μm; the spraying speed is 1000 mm / s, spraying 6 times, and the coating thickness reaches 35 μm; the spraying process parameters of the Si bonding layer are: the vacuum degree i...

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Abstract

The invention relates to a preparation method of an environmental protection coating of a SiCf/SiC composite material guider blade. The preparation method comprises the following steps: preheating a SiCf/SiC composite material guider blade matrix, and performing PS-PVD (Plasma Spraying-Physical Vapor Deposition) to prepare a Si adhesive layer, a mullite transitional layer, a Yb2SiO5 environmental barrier layer and a La2Zr2O7 heat resistant layer in sequence, wherein the environmental protection coating can be applied to a gas environment at 1,400 to 1,700 DEG C. Preparation of the Si adhesive layer, the mullite transitional layer, the Yb2SiO5 environmental barrier layer and the La2Zr2O7 heat resistant layer of the environmental protection coating is completed on the same equipment; the temperature of the matrix is effectively controlled through heating of a PS-PVD spraying gun, so as to prevent amorphous reaction in a deposition process of the mullite transitional layer; the added heat resistant layer enables the environmental protection coating to adapt to the gas environment at 1,400 to 1,700 DEG C; therefore, the preparation method is applicable to preparation of the environmental protection coating of a high-performance guider blade. The preparation method has the advantages that the preparation process is simple, easy to operate, high in stability, wide in applicable temperature range and wide in application range.

Description

technical field [0001] The invention relates to the field of surface engineering, in particular to a SiC f / SiC composite material deflector vane environmental protection coating and preparation method thereof. Background technique [0002] SiC will be widely used in guide blades of the next four generations of aero engines f / SiC composites. However, in the service environment of the hot end parts of the aeroengine, SiC f / SiC must face harsh environments, including high temperature, high pressure, high stress, oxidizing atmosphere and corrosive atmosphere, among which SiO produced by oxidation of SiC 2 React with water vapor to produce volatile Si(OH) X , accelerates the oxidation of the matrix material, leading to a sharp decline in the performance of the composite material and premature failure. Therefore, an environmental protection coating must be prepared on the surface of the composite material to improve its environmental performance and increase the service lif...

Claims

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Application Information

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IPC IPC(8): C23C28/04C23C4/134C23C4/11C23C4/10C23C4/04C23C14/08C23C14/06C23C14/16F01D1/02F01D25/00
CPCC23C28/042C23C4/04C23C4/10C23C4/11C23C4/134C23C14/0635C23C14/08C23C14/16F01D1/02F01D25/007F05D2230/90
Inventor 张铀郭双全黄璇璇姚改成张良成叶勇松刘俊伶
Owner PLA NO 5719 FACTORY
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