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A kind of preparation method of SICW directional high-strength toughened thick-walled ceramic matrix composite material

A composite material and toughened thick-walled technology, applied in the field of preparation of ceramic matrix composite materials, can solve the problems of blocking stress conduction path, increasing stress concentration effect, affecting the comprehensive performance of materials, etc., so as to prevent crack propagation and improve toughness , the effect of improving toughness

Active Publication Date: 2021-10-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the mass transfer channel is still used as a "hollow rivet". The hollow structure will block the stress conduction path. When the diameter of the mass transfer channel is too large, the stress concentration effect will be increased and the overall performance of the material will be affected.

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  • A kind of preparation method of SICW directional high-strength toughened thick-walled ceramic matrix composite material
  • A kind of preparation method of SICW directional high-strength toughened thick-walled ceramic matrix composite material
  • A kind of preparation method of SICW directional high-strength toughened thick-walled ceramic matrix composite material

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preparation example Construction

[0039] The preparation method proposed by the invention is SiCw directional high-strength and toughened thick-walled ceramic matrix composite material. The technical scheme of the method is: based on the mechanical processing-assisted chemical vapor infiltration method, the vacuum impregnation method is used to use SiCw as the oriented column processed in the thickness direction of the second-phase sealing prefabricated body. SiC whisker toughened ceramic-based thick-walled parts have two major features: on the one hand, a millimeter-scale SiCw directional pin structure packing column is formed in the thickness direction of the ceramic matrix composite material, thereby increasing the bonding strength between layers and strengthening the structure; On the one hand, SiCw penetrates into the interlayer of ceramic matrix composites to form a micron-scale SiCw interlayer structure, which wraps fiber bundles or filaments, effectively hinders crack propagation and improves toughness....

Embodiment 1

[0047] SiCw directional high strength toughness density is 1.45g / cm 3 , C / SiC composite material with a wall thickness of 7mm, the specific process is:

[0048] (1) The preparation density is 1.45g / cm 3 The prefabricated body: T300-1K carbon fiber is used to weave two-dimensional plain weave cloth, and after superimposing 40 layers of stitching, a volume density of 0.75g / cm is prepared. 3 1. A carbon fiber prefabricated body with a carbon fiber volume fraction of 32.0%. The preform was placed in a CVI vacuum furnace with a deposition temperature of 900°C, an atmosphere pressure of 0.2KPa, a propylene flow rate of 30ml / min, and an Ar flow rate of 300ml / min to prepare a pyrolytic carbon interface layer (PyC) with a pyrolysis thickness of about 200nm. Place the preform in a CVI vacuum furnace with a deposition temperature of 1100°C and an atmosphere pressure of 2KPa, H 2 The flow rate is 200ml / min, the Ar flow rate is 300ml / min, and the density is 1.45g / cm 3 C / SiC preforms. ...

Embodiment 2

[0057] SiCw directional high strength toughness density is 1.35g / cm 3 , C / SiC composite material with a wall thickness of 10mm, the specific process is:

[0058] (1) The preparation density is 1.35g / cm 3 The prefabricated body: T300-1K carbon fiber is used to weave two-dimensional plain weave cloth, and after superimposing 60 layers of stitching, the volume density is 0.75g / cm 3 1. A carbon fiber prefabricated body with a carbon fiber volume fraction of 32.0%. The preform was placed in a CVI vacuum furnace with a deposition temperature of 900°C, an atmosphere pressure of 0.2KPa, a propylene flow rate of 30ml / min, and an Ar flow rate of 300ml / min to prepare a pyrolytic carbon interface layer (PyC) with a pyrolysis thickness of about 200nm. Place the preform in a CVI vacuum furnace with a deposition temperature of 1100°C and an atmosphere pressure of 2KPa, H 2 The flow rate is 200ml / min, the Ar flow rate is 300ml / min, and the density is 1.35g / cm 3 C / SiC preforms.

[0059] (...

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Abstract

The invention relates to a method for SiCw directional high-strength and toughened thick-walled ceramic-based composite material. The prefabricated body is prepared in a high-temperature furnace for the interface layer and the matrix, so that the relative density of the prefabricated body reaches 40% to 80%; the method is prepared by machining Oriented channels of ceramic matrix composites; use ball milling to prepare SiCw slurry, combine with vacuum impregnation method to seal and fill the oriented channels, and repeatedly impregnate until the oriented channels are opaque; use CVI method to further densify the prefabricated body, and finally obtain high-strength and toughness ceramic matrix composites. The advantages of this process: (1) The typical SiCw directional packing pin structure greatly improves the interlayer bonding strength of the composite material; (2) The SiCw interlayer structure wraps fiber filaments and fiber bundles, which can effectively prevent crack propagation and improve the composite strength. Material toughness; (3) The directional sealing channel is designed, and the size, spacing and distribution can be designed according to different needs, and the operation is simple.

Description

technical field [0001] The invention belongs to a preparation method of a ceramic-based composite material, and relates to a preparation method of a SiCw directional high-strength and toughened thick-walled ceramic-based composite material. Background technique [0002] Ceramic matrix composites have a series of excellent properties such as high temperature resistance, high specific strength, high specific modulus, thermal shock resistance, and ablation resistance, and exhibit excellent high temperature thermodynamic properties and microstructure stability. Lightweight composite materials resistant to harsh environments have great application potential in the fields of heat insulation / heat protection of aerospace vehicles, aero engines, satellite attitude control engines, hypersonic ramjet engines and solid rocket motors and other weapons and equipment. [0003] The chemical vapor infiltration (chemical vapor infiltration, CVI) process has the advantages of less damage to fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/81C04B35/577C04B35/622
Inventor 王晶刘永胜曹立阳成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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