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Silicon carbide/graphene bionic laminated coating and preparation method thereof

A silicon carbide layer and graphene layer technology, applied in the field of silicon carbide/graphene bionic laminated coating and preparation, can solve the problems of unfavorable coating oxidation resistance, accelerated coating failure process, insufficient dense coating, etc. Excellent anti-oxidation performance, increased fracture work, uniform and dense coating effect

Active Publication Date: 2021-06-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, this toughening method produces many defects at the interface between the nanomaterial and the SiC coating, and crack initiation occurs first at these defects, which accelerates the failure process of the coating.
At the same time, due to the gradient distribution of the density of the prepared nanomaterials, it is difficult for the reactant gas to penetrate into the interior of the nanomaterial layer during the preparation of the SiC coating, so the prepared coating is not dense enough, which is not conducive to the oxidation resistance of the coating.

Method used

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  • Silicon carbide/graphene bionic laminated coating and preparation method thereof
  • Silicon carbide/graphene bionic laminated coating and preparation method thereof
  • Silicon carbide/graphene bionic laminated coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) The density is 1.7g / cm 3 The two-dimensional C / C composite material is used as the matrix, and a sample with a size of 10mm×10mm×10mm is cut from the C / C composite material, polished with 400 mesh SiC sandpaper, then ultrasonically cleaned with ethanol, and placed in a temperature of 70 Dry in an oven at ℃ for 4 h.

[0029] 2) Hang the C / C substrate in the deposition area of ​​the vertical resistance furnace, vacuumize to -0.095Mpa, pass Ar as the protective gas, and raise the furnace temperature to 1000°C at a heating rate of 5°C / min. When the temperature reaches the deposition temperature, dilute Ar and react H 2 , and then open the carrier gas H 2 Methyltrichlorosilane (MTS) is brought into the reaction zone for deposition, and the gas flow control range during this process is: dilute Ar: 300 sccm, react H 2 : 2L / min, carrier gas H 2 : 30sccm; the deposition time is 2h, after the deposition is completed, stop feeding the reaction gas, turn off the heating powe...

Embodiment 2

[0033] 1) The density is 1.7g / cm 3 The two-dimensional C / C composite material is used as the matrix, and a sample with a size of 10mm×10mm×10mm is cut from the C / C composite material, polished with 400 mesh SiC sandpaper, then ultrasonically cleaned with ethanol, and placed in a temperature of 70 Dry in an oven at ℃ for 4 h.

[0034] 2) Hang the C / C substrate in the deposition area of ​​the vertical resistance furnace, evacuate to -0.095Mpa, pass Ar as the protective gas, and raise the furnace temperature to 1100°C at a heating rate of 5°C / min. When the temperature reaches the deposition temperature, dilute Ar and react H 2 , and then open the carrier gas H 2 Methyltrichlorosilane (MTS) is brought into the reaction zone for deposition, and the gas flow control range during this process is: dilute Ar: 300 sccm, react H 2 : 0.5L / min, carrier gas H 2 : 10sccm; the deposition time is 4h, after the deposition, stop feeding the reaction gas, turn off the heating power supply to ...

Embodiment 3

[0038] 1) The density is 1.7g / cm 3 The two-dimensional C / C composite material is used as the matrix, and a sample with a size of 10mm×10mm×10mm is cut from the C / C composite material, polished with 400 mesh SiC sandpaper, then ultrasonically cleaned with ethanol, and placed in a temperature of 70 Dry in an oven at ℃ for 4 h.

[0039] 2) Hang the C / C substrate in the deposition area of ​​the vertical resistance furnace, evacuate to -0.095Mpa, pass Ar as the protective gas, and raise the furnace temperature to 1200°C at a heating rate of 5°C / min. When the temperature reaches the deposition temperature, dilute Ar and react H 2 , and then open the carrier gas H 2 Methyltrichlorosilane (MTS) is brought into the reaction zone for deposition, and the gas flow control range during this process is: dilute Ar: 600 sccm, react H 2 : 1.5L / min, carrier gas H 2 : 20sccm; deposition time is 2h. After the deposition, stop feeding the reaction gas, turn off the heating power supply to coo...

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Abstract

The invention relates to a silicon carbide / graphene bionic laminated coating and a preparation method thereof. SiC and graphene are alternately deposited through a chemical vapor deposition method to obtain a novel ceramic coating with a bionic multi-layer structure, and the structural effect of the novel ceramic coating is utilized to realize toughening of the ceramic coating. The introduced graphene plays a role as a weak interface, when the crack expands to the weak interface, the crack deflects, and after the crack expands for a certain distance along the weak interface, the crack continues to expand towards a next SiC layer and deflects again when reaching the weak interface. The crack propagation path is greatly increased and more energy can be absorbed due to repeated deflection of the crack on the weak interface, so that the fracture work is greatly increased and the fracture toughness is improved. Through the designed laminated coating, the sensitivity to cracks can be reduced, the cracks are expanded in a stepped manner, and the generation of penetrating cracks is avoided, so that the oxidation resistance of the coating is improved, and a C / C substrate can be more effectively protected.

Description

technical field [0001] The invention belongs to a C / C composite material coating and a preparation method, and relates to a silicon carbide / graphene bionic laminated coating and a preparation method. Background technique [0002] C / C composite material is a carbon-based composite material with carbon fiber as the reinforcing phase, and its composition is all carbon elements. It is a new type of high-performance composite material with both structural and functional properties. The material has a series of unique physical and chemical properties: low density, high specific strength and specific modulus, good fracture toughness, small thermal expansion coefficient, high temperature resistance, ablation resistance, thermal shock resistance and stable chemical properties. These advantages make it unique in the application of aviation, aerospace and military high-tech fields. However, in an oxidizing atmosphere, the C / C composite material will begin to oxidize rapidly at 450 °C,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/83C04B41/5059C04B41/4531C04B41/5001C04B41/524
Inventor 张雨雷陈国辉宋强张鹏飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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