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Densification method of PIP (precursor infiltration pyrolysis) in combination with in-situ growth of graphene or boron nitride nanotube ceramic matrix composite

A boron nitride nanotube and composite material technology, which is applied in the field of densification of PIP combined with in-situ growth graphene/boron nitride nanotube ceramic matrix composite materials, can solve problems such as affecting the performance of materials, and achieves a simple preparation method and improved High performance and controllability

Active Publication Date: 2018-09-14
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a PIP combined in-situ growth graphene / boron nitride nanotube ceramic matrix composite material densification method, to improve the current ceramic matrix composite materials produced in the process of preparation and use. Pores and cracks that seriously affect the performance of the material

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  • Densification method of PIP (precursor infiltration pyrolysis) in combination with in-situ growth of graphene or boron nitride nanotube ceramic matrix composite

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preparation example Construction

[0027]The preparation method of the slurry includes the steps of: adding graphene into the ethanol aqueous solution, stirring evenly, and ultrasonically dispersing for 0.5-5 hours to prepare a graphene dispersion with a concentration of 0.5-5 g / L; mixing the graphene dispersion and boron Powder mixing, first use zirconia ball milling for 50-130 hours, and then use steel ball milling for 3-24 hours to obtain slurry; wherein, the ratio of ball to material is (1-150): 1, and the rotating speed is 200-450rpm; The volume fraction of ethanol is 20%-50%, and the mass ratio of graphene dispersion liquid and boron powder is (5-50):1.

[0028] S4 (Cyclic Densification): Repeat the steps of S2 and / or S3 for the initial product of the ceramic matrix composite material to obtain an in-situ growth graphene / boron nitride nanotube dense fiber reinforced ceramic matrix composite material.

Embodiment 1

[0031] This embodiment provides a method for densifying a PIP combined in-situ growth graphene / boron nitride nanotube ceramic matrix composite material, comprising the steps of:

[0032] S1 (preparing interface layer): depositing a silicon carbide interface layer on the surface of the silicon carbide carbon fiber preform fabric to obtain a preform prepared with an interface layer;

[0033] Among them, the silicon carbide interface layer was prepared by chemical vapor deposition (CVD), with MTS as the precursor, hydrogen with a flow rate of 200sccm as the carrier gas and diluent gas, and argon with a flow rate of 75sccm as the protective gas.

[0034] S2 (immersion cracking): put the preform prepared with the interface layer into the precursor solution and immerse it for 24 hours. After the immersion is completed, take the immersed preform out of the immersion equipment, put it in the air, and let it dry naturally at room temperature. Dry, then put it into an oven to dry at 120...

Embodiment 2

[0041] This embodiment provides a method for densifying a PIP combined in-situ growth graphene / boron nitride nanotube ceramic matrix composite material, comprising the steps of:

[0042] S1 (preparing the interface layer): depositing a pyrolytic carbon layer on the surface of the silicon carbide SiC fiber preform fabric to obtain a preform prepared with an interface layer;

[0043] Among them, when chemical vapor deposition (CVD) is used to prepare the pyrolytic carbon layer, methane is used as the gas source, and N 2 For the carrier gas, the temperature is 900 ℃, the pressure is 3kPa.

[0044] S2 (immersion cracking): put the preform prepared with the interface layer into the precursor solution and immerse it for 24 hours. After the immersion is completed, take the immersed preform out of the immersion equipment, put it in the air, and let it dry naturally at room temperature. Dry, then put it into an oven to dry at 120°C for 5 hours; take it out after drying, heat up to 300...

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Abstract

The invention relates to a densification method of PIP (precursor infiltration pyrolysis) in combination with in-situ growth of graphene or boron nitride nanotube ceramic matrix composites. The densification method includes the steps of depositing an interfacial layer on the surface of a preform, then impregnating and cracking, conducting in-situ growth of the graphene or boron nitride nanotubes to obtain first products of the ceramic matrix composites, repeating the steps of impregnating and cracking and / or conducting the in-site growth of the graphene or boron nitride nanotubes on the firstproducts of the ceramic matrix composites, obtaining the in-situ grown graphene or boron nitride nanotube dense-fiber reinforced ceramic matrix composites. In the process of densification of traditional fiber reinforced ceramic matrix composites, defects such as pores and cracks are formed inside the composites due to gas generation during heat treatment, which affects the mechanical properties of the material, while the in-situ grown graphene or boron nitride nanotubes can increase the densification and toughness of the material and significantly improve the properties of the composites.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for densifying a PIP combined in-situ growth graphene / boron nitride nanotube ceramic matrix composite material. Background technique [0002] The matrix of silicon carbide ceramic matrix composites is dense β-SiC with excellent mechanical and thermal properties. The main obstacle in the densification process is that it is difficult to completely fill the precursors in prefabricated gaps and voids to achieve densification. The porosity of the composites not only leads to gas permeation, but also reduces the mechanical strength, elastic modulus and thermal conductivity, so minimizing the porosity of the material during the preparation process can effectively improve the material properties. For the preparation of ceramic matrix composites by precursor conversion method, the density is one of the two key factors affecting the properties of the material. However, the curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/45C04B41/52
CPCC04B41/4596C04B41/52C04B41/5059C04B41/4531C04B41/0072C04B41/5064C04B41/5001C04B41/455C04B41/4535
Inventor 罗瑞盈闫妍
Owner BEIHANG UNIV
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