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SiC whisker-reinforced ceramic-based composite plate and preparation method thereof

A composite plate and ceramic-based technology, which is applied in the field of ceramic-based composite plates and its preparation, can solve the difficulty of separating silicon carbide whiskers from reaction residues, affect the reinforcing effect of silicon carbide whiskers on substrates, and reduce silicon carbide whiskers Quality and other issues, to achieve the effect of improved fracture toughness and bending strength, high reliability in use, and good reinforcement effect

Active Publication Date: 2014-10-29
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The silicon carbide whiskers obtained in the preparation methods of the above two composite materials are difficult to separate from the reaction residue, and the impurity content is high, especially the separation process will reduce the quality of the silicon carbide whiskers, which affects the reinforcement of the silicon carbide whiskers to the substrate. effect

Method used

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  • SiC whisker-reinforced ceramic-based composite plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add monomer acrylamide and cross-linking agent methylenebisacrylamide to the aqueous solution to form a premix solution with a concentration of 15%;

[0023] (2) Add the premix liquid and dispersant ammonium polyacrylate to the proportioned inorganic ceramic powder according to the requirement of 55% solid phase volume fraction, adjust the pH to 11, and ball mill and mix for 15 hours to make a slurry;

[0024] (3) After the slurry is exhausted, add the initiator ammonium persulfate, fully stir and remove the air bubbles, inject it into the mold cavity, add the catalyst tetramethylethylenediamine, gel for 45 minutes, and place it in a stable place after demoulding;

[0025] (4) Put the above green body into an oven with a temperature of 70°C and a drying time of 12 hours;

[0026] (5) After drying, degumming at 600°C removes the molding agent to obtain a prefabricated body, and then surface processing, the precision reaches the sealing material level;

[0027] (6) P...

Embodiment 2

[0030] (1) Add monomer acrylamide and crosslinking agent methylenebisacrylamide to the aqueous solution to form a premix solution with a concentration of 20%;

[0031] (2) Add the premix liquid and the dispersant ammonium polyacrylate to the proportioned inorganic ceramic powder according to the requirement of 60% solid phase volume fraction, adjust the pH to 10, and ball mill and mix for 20 hours to make a slurry;

[0032] (3) After the slurry is exhausted, add the initiator ammonium persulfate, fully stir and remove the air bubbles, inject it into the mold cavity, add the catalyst tetramethylethylenediamine, gel for 60 minutes, and place it in a stable place after demoulding;

[0033] (4) Put the above green body into an oven with a temperature of 80°C and a drying time of 10 hours;

[0034] (5) After drying, degumming at 700°C removes the molding agent to obtain a prefabricated body, and then surface processing, the precision reaches the sealing material level;

[0035] (6...

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Abstract

The invention discloses a SiC whisker-reinforced ceramic-based composite plate and a preparation method thereof. The SiC whisker-reinforced ceramic-based composite plate comprises the following raw materials by volume percent: 60%-80% of inorganic ceramic powder substrate and 20%-40% of chemical vapor infiltration (CVI)-SiC whiskers, wherein the SiC whiskers are inlaid in the ceramic substrate and are closely combined with the ceramic substrate; the inorganic ceramic powder substrate is silicon carbide, silicon nitride, boron nitride or boron carbide, and the particle size of ceramic powder is 10-100m um. A ceramic preform is prepared by adopting a gel casting method, and the SiC whiskers grow in the preform in combination with a chemical vapor infiltration CVI process to densify the ceramic preform. The SiC whisker-reinforced ceramic-based composite plate is prepared by adopting combination of the gel casting process and CVI process, is improved in breaking tenacity and bending strength and is high in use reliability.

Description

technical field [0001] The invention relates to a ceramic matrix composite board and a preparation method thereof, in particular to a SiC whisker-reinforced ceramic matrix composite board and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, various industrial sectors such as machinery, electronics, aerospace, and energy have put forward higher requirements on the performance of materials. Existing metal or polymer materials are often difficult to meet, so they have high hardness, wear resistance, Ceramic materials with excellent properties such as corrosion resistance and thermochemical stability have attracted increasing attention. At the same time, the weakness of high brittleness and low toughness of ceramic materials has also become a research hotspot in various countries. [0003] Silicon carbide whiskers (SiC w ) is a highly oriented single crystal fiber with a diameter of nanometer to micrometer. The c...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B35/622
Inventor 陈照峰余盛杰
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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