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A fiber-reinforced composite material surface coating in engine environment and preparation method thereof

A technology of fiber reinforcement and composite materials, applied in the field of materials, can solve the problems of not being able to better protect the thermal stress of the middle layer and the inner layer, and not being able to adapt

Active Publication Date: 2018-07-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the environmental barrier coatings that are widely used do not use some oxides with better heat insulation effect. Although they can be applied in the engine environment, they cannot adapt to the increasingly high environmental requirements of the engine, and cannot be better in high temperature environments. Protect the thermal stress of the middle layer and the inner layer, especially the working temperature of 1400°C and higher

Method used

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  • A fiber-reinforced composite material surface coating in engine environment and preparation method thereof
  • A fiber-reinforced composite material surface coating in engine environment and preparation method thereof

Examples

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preparation example Construction

[0026] Such as figure 1 As shown, a method for preparing a surface coating of a fiber-reinforced composite material in an engine environment according to an embodiment of the present invention mainly includes the following steps.

[0027] S101: Deposit a silicon bonding layer on the surface of the fiber-reinforced composite material by chemical vapor deposition. Generally, SiCl 4 and H 2 Reaction, the reaction formula involved is:

[0028] SiCl 4 (l)→SiCl 4 (g), SiCl 4 (g)+2H 2 (g)→Si(s)+4HCl(g).

[0029] Among them, the deposition vacuum degree of the inner layer silicon is 3×10 4 pa~5×10 4 pa, the temperature is set at 950°C to 1150°C, which can ensure the smooth progress of the reaction and the participation of impurities. SiCl 4 The flow rate is 2.0×10 -5 m 3 / s~3.0×10 -5 m 3 / s,H 2 The flow rate is 4.0 x 10 -5 m 3 / s~6.0×10 -5 m 3 / s, so that the reaction can fully take place. The thickness of the prepared bonding layer is about 10 μm to 30 μm. The f...

Embodiment 1

[0061] Embodiment 1 provides a preparation process of a fiber-reinforced SiC / SiC composite coating in an engine environment, and the specific steps are as follows:

[0062] 1) The fiber-reinforced SiC / SiC composite material after surface polishing was ultrasonically cleaned in absolute ethanol, and the cleaned sample was put into an oven and dried at 90°C for 6 hours.

[0063] 2) Put the cleaned fiber-reinforced SiC / SiC composite material into a chemical vapor deposition furnace to deposit a silicon bonding layer. The deposition vacuum of the silicon bonding layer is 3×10 4 pa, temperature set at 950°C, SiCl 4 The flow rate is about 3.0×10 -5 m 3 / s,H 2 The flow rate is 6.0×10 -5 m 3 / s, the thickness of the prepared bonding layer is about 10 μm, and the reactions involved are:

[0064] SiCl 4 (l)→SiCl 4 (g), SiCl 4 (g)+2H 2 (g)→Si(s)+4HCl(g).

[0065] 3) The middle layer is also prepared by the chemical vapor deposition method. Since the preparation method is the s...

Embodiment 2

[0077] Embodiment 2 provides a preparation process of a fiber-reinforced SiC / SiC composite coating in an engine environment, and the specific steps are as follows:

[0078] 1) Put the fiber-reinforced SiC / SiC fiber-reinforced composite sample after surface polishing into absolute ethanol for ultrasonic cleaning, and put the cleaned sample into an oven and dry it at 100°C for 4 hours.

[0079] 2) Put the cleaned SiC / SiC composite material into a chemical vapor deposition furnace to deposit a silicon bonding layer. The deposition vacuum of the silicon bonding layer is 5×10 4 pa, temperature set at 1150°C, SiCl 4 The flow rate is about 3.0×10 -5 m 3 / s,H 2 The flow rate is 6.0×10 -5 m 3 / s, the thickness of the prepared bonding layer is about 30 μm, and the reactions involved are:

[0080] SiCl 4 (l)→SiCl 4 (g), SiCl 4 (g)+2H 2 (g)→Si(s)+4HCl(g).

[0081] 3) The middle layer is also prepared by the chemical vapor deposition method. Since the preparation method is the s...

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Abstract

The present invention relates to a fiber reinforced composite material surface coating in an engine environment, and a preparation method thereof. The preparation method comprises: depositing a silicon adhesion layer on the surface of a fiber reinforced composite material by using a chemical vapor deposition method; depositing a middle layer on the surface of the adhesion layer by using the chemical vapor deposition method; after dipping a thermal barrier coating material on the surface of the middle layer, heating the fiber reinforced composite material to a first preset temperature at a heating rate of 10-20 DEG C / min, carrying out thermal insulation for a preset time, cooling to a second preset temperature at a cooling rate of 20-30 DEG C / min, and naturally cooling to a room temperature so as to prepare a thermal barrier layer; and spraying yttrium silicate powder on the surface of the thermal barrier coating by using a plasma spraying method so as to prepare the surface layer. According to the present invention, with the fiber reinforced composite material surface coating in the engine environment, the oxidation resistance and the thermal insulation property of the engine are well improved.

Description

technical field [0001] The invention relates to the field of materials, in particular to a surface coating of a fiber-reinforced composite material in an engine environment and a preparation method thereof. Background technique [0002] As the engines used in aerospace continue to be updated, the engines will face a more stringent working environment, which puts forward higher and higher requirements for the long life of engine components. In order to adapt to the complex engine environment, it is necessary to develop and study new coating protection processes for hot end components. The problem with the commonly used coatings at present is that they cannot work for a long time in the temperature range above 1400°C, and the coating materials are single. In the field of aviation industry, the biggest trend is that the engine requires higher and higher operating temperatures, which also puts forward higher requirements for materials. Currently, the maximum operating temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/52C04B41/89C04B41/5096C04B41/4531C04B41/5027C04B41/5045C04B41/5042C04B41/4535C04B41/5024C04B41/4545
Inventor 罗瑞盈宋涛
Owner BEIHANG UNIV
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