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Preparation method of crystal whisker/fiber synergic reinforced ceramic-base composite material

A composite material and ceramic-based technology, which is applied in the field of preparation of ceramic-based composite materials, can solve problems such as poor bending strength and achieve the effect of improving strength and toughness

Inactive Publication Date: 2014-10-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency of poor flexural strength of the material prepared by the existing C / SiC composite material preparation method, the present invention provides a method for preparing a whisker and fiber synergistically reinforced ceramic matrix composite material

Method used

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  • Preparation method of crystal whisker/fiber synergic reinforced ceramic-base composite material
  • Preparation method of crystal whisker/fiber synergic reinforced ceramic-base composite material
  • Preparation method of crystal whisker/fiber synergic reinforced ceramic-base composite material

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: (1) SiC with an aspect ratio of 8 to 11 is used w Whiskers are used as a reinforcement, and the volume fraction is 20% alcohol as a solution, sonicated for 30 minutes, magnetically stirred for 2 hours, and dried;

[0025] (2) With isopropanol and toluene as solvent, SiC in step (1) w Whiskers are solutes, triethyl phosphate is used as a dispersant for ball milling for 10 hours, and the volume fraction of whiskers is controlled at 5%.

[0026] (3) Add polyvinyl butyral (PVB) as a binder and glycerol as a plasticizer to the slurry in step (2), and ball mill for 8 hours to obtain a stable SiC w slurry.

[0027] (4) Apply a layer of 5wt% SiC prepared in step (3) on 25 sheets of 2D[0° / 90°] carbon fiber cloth w Whisker slurry, dry naturally;

[0028] (5) with 5wt% SiC in step (4) w The 2D [0° / 90°] carbon fiber cloth of the whisker is stacked sequentially; from figure 2 SiC can be seen w Whisker layers and carbon cloth layers are alternately stacked.

[...

Embodiment 2

[0035] Embodiment 2: (1) SiC with an aspect ratio of 8 to 11 is used w Whiskers are used as a reinforcement, and the volume fraction is 20% alcohol as a solution, sonicated for 30 minutes, magnetically stirred for 2 hours, and dried;

[0036] (2) With isopropanol and toluene as solvent, SiC in step (1) w Whiskers are solutes, triethyl phosphate is used as a dispersant for ball milling for 10 hours, and the volume fraction of whiskers is controlled at 15%.

[0037] (3) Add polyvinyl butyral (PVB) as a binder and glycerol as a plasticizer to the slurry in step (2), and ball mill for 8 hours to obtain a stable SiC w slurry.

[0038](4) Apply a layer of 15wt% SiC prepared in step (3) on 25 sheets of 2D[0° / 90°] carbon fiber cloth w Whisker slurry, dry naturally;

[0039] (5) with 15wt% SiC in step (4) w The 2D [0° / 90°] carbon fiber cloth of the whiskers is stacked sequentially.

[0040] (6) Clamp the above-mentioned carbon fiber cloth stack with two porous shaped graphite tem...

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Abstract

The invention discloses a preparation method of a crystal whisker / fiber synergic reinforced ceramic-base composite material, which is used for solving the technical problem of poor bending strength in the material prepared by the existing C / SiC composite material preparation method. The technical scheme is as follows: the preparation method comprises the following steps: uniformly dispersing pretreated crystal whiskers by ball milling, uniformly brushing the crystal whiskers onto every carbon fiber cloth layer by a slurry brushing process, naturally drying, laminating, puncturing and sewing the lamination together with carbon fibers to prepare a crystal whisker fiber precast body, depositing a pyrolytic carbon interface layer on the crystal whisker fiber precast body by a gas-phase permeation process, and finally, depositing the SiC base for compaction. The introduced crystal whiskers are uniformly distributed in the lamination direction, and the binary synergic enhancement effect is utilized to enhance the strength and toughness of the C / SiC composite material. The test proves that the bending strength of the C / SiC composite material is enhanced from 235 MPa in the background art to 381-466 MPa under identical conditions.

Description

technical field [0001] The invention relates to a preparation method of a ceramic matrix composite material, in particular to a preparation method of a whisker and fiber synergistically reinforced ceramic matrix composite material. Background technique [0002] Silicon carbide whisker is a single crystal fiber with few defects and a certain aspect ratio, which has high melting point, low density, high strength, high elastic modulus, low thermal expansion rate, wear resistance, corrosion resistance and high temperature resistance. It is an ideal strengthening and toughening material. The mechanical properties of whisker-toughened composites can be significantly improved by utilizing the effects of crack deflection, whisker pull-out and bridging produced by whiskers. [0003] The document "CVI-C / SiC Composite Preform Structure and Mechanical Properties [D]. Xi'an: Northwestern Polytechnical University, May 2009" discloses a method for preparing C / SiC composite materials by ch...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/81C04B35/565C04B35/622
Inventor 梅辉成来飞李海青解玉鹏白强来
Owner NORTHWESTERN POLYTECHNICAL UNIV
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