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Preparation method of toughened BNNSs/SiC ceramic matrix composite material

A composite material and ceramic-based technology, which is applied in the field of preparation of toughened BNNSs/SiC ceramic-based composite materials, can solve the problems affecting the application effect and achieve the effect of improving the dispersion performance

Inactive Publication Date: 2021-02-26
侯光宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong van der Waals interaction between BNNSs, it is easy to form a large number of secondary agglomerated large particles in various solution dispersion systems, which greatly affects its application effect.

Method used

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  • Preparation method of toughened BNNSs/SiC ceramic matrix composite material
  • Preparation method of toughened BNNSs/SiC ceramic matrix composite material
  • Preparation method of toughened BNNSs/SiC ceramic matrix composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing a toughened BNNSs / SiC ceramic matrix composite material, comprising the following steps:

[0029] S1. Weigh 100mg of hexagonal boron nitride and put it into an 80ml ball milling jar, then put 2g of 5-aminovaleric acid and 35ml of deionized water into the ball milling jar, seal the ball milling jar, and perform mechanical ball milling at a speed of 1200rpm for 16h, then suction filter, Washing with water and drying to obtain functionalized boron nitride nanosheets; mix vinyl tris (β-methoxyethoxy) silane and glycidyl methacrylate evenly, and then add to the hydrogen-terminated oligomerization process containing platinum catalyst React in siloxane at 25°C for 120min to obtain a silane coupling agent containing an epoxy group; dissolve the obtained silane coupling agent containing an epoxy group in DMF, and then add the functionalized hexagonal boron nitride nanometer slices, ultrasonically stirred in a water bath, the stirring rate was 200rpm, and t...

Embodiment 2

[0036] A method for preparing a toughened BNNSs / SiC ceramic matrix composite material, comprising the following steps:

[0037] S1. Weigh 140mg of hexagonal boron nitride and put it into an 80ml ball milling jar, then put 2g of 5-aminovaleric acid and 50ml of deionized water into the ball milling jar, seal the ball milling jar, and perform mechanical ball milling at a speed of 900rpm for 18h, then suction filter. Washing with water and drying to obtain functionalized boron nitride nanosheets; dissolving the silane coupling agent containing epoxy groups (the preparation method is the same as in Example 1) in DMF, then adding functionalized hexagonal boron nitride nanosheets, and ultrasonically stirring in a water bath , the stirring rate is 250rpm, and the grafting reaction is carried out at 100°C for 10h. After the grafting reaction is completed, it is suction filtered, washed with water, and dried to obtain a boron nitride nanosheet grafted silane coupling agent product, which...

Embodiment 3

[0042] A method for preparing a toughened BNNSs / SiC ceramic matrix composite material, comprising the following steps:

[0043] S1. Weigh 120mg of hexagonal boron nitride and put it into an 80ml ball milling jar, then put 2g of 5-aminovaleric acid and 40ml of deionized water into the ball milling jar, seal the ball milling jar, and perform mechanical ball milling at a speed of 900rpm for 14h, then suction filter, Washing with water and drying to obtain functionalized boron nitride nanosheets; mix vinyl tris (β-methoxyethoxy) silane and glycidyl methacrylate evenly, and then add to the hydrogen-terminated oligomerization process containing platinum catalyst React in siloxane at 20°C for 100 minutes to obtain a silane coupling agent containing epoxy groups; dissolve the obtained silane coupling agent containing epoxy groups in DMF, and then add functionalized hexagonal boron nitride nanosheets, Ultrasonic stirring in a water bath, the stirring rate is 250rpm, and the grafting re...

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Abstract

The invention discloses a preparation method of a toughened BNNSs / SiC ceramic matrix composite material, which comprises the steps of S1, carrying out surface modification treatment on hexagonal boronnitride, and adding a silane coupling agent to react to obtain a boron nitride nanosheet grafted silane coupling agent product; S2, carrying out graft modification on nano silicon carbide fibers by adopting polyacrylamide chloride to obtain hydroxylated nano silicon carbide fibers grafted with the polyacrylamide chloride; S3, adding the hydroxylated nano silicon carbide fibers grafted with the polyacrylamide chloride into the boron nitride nanosheet grafted silane coupling agent product, and stirring for reaction to obtain a mixture A; and S4, dipping the mixture A into a polycarbosilane precursor solution, and carrying out curing and high-temperature sintering to form the toughened BNNSs / SiC ceramic matrix composite material. According to the preparation method, hexagonal boron nitride and the nano silicon carbide fibers are respectively modified and then grafted, so that the dispersity of hexagonal boron nitride and nano silicon carbide fibers in a matrix is improved, and the obtained BNNSs / SiC ceramic matrix composite material has excellent breaking tenacity, hardness and bending strength.

Description

technical field [0001] The invention relates to the technical field of material modification treatment, in particular to a preparation method of a toughened BNNSs / SiC ceramic matrix composite material. Background technique [0002] Silicon carbide ceramics have excellent mechanical properties, excellent oxidation resistance and corrosion resistance, high wear resistance and low coefficient of friction. High-temperature mechanical properties (strength, creep resistance, etc.) are excellent, and the high-temperature strength can be maintained up to 1600 ° C. It is the material with the best high-temperature strength among ceramic materials. Due to the light weight, high temperature resistance and good high temperature stability of silicon carbide ceramic matrix composite materials, it is widely used in aerospace and other military fields, especially in the application of aircraft and rocket engines. However, silicon carbide ceramics have the problems of high brittleness and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/84C04B35/628C01B21/064B82Y40/00B82Y30/00
CPCC04B35/62886C04B35/62863C01B21/0648B82Y40/00B82Y30/00C04B2235/5292C04B2235/5244C04B2235/483C01P2004/20C04B2235/77C04B2235/96
Inventor 侯光宇
Owner 侯光宇
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