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Preparation method of wave-transparent ceramic-base composite material containing silicon-boron-nitrogen interface

A composite material and ceramic-based technology, which is applied in the field of preparation of wave-transmitting ceramic-based composite materials, can solve the problems of too much free silicon and great influence on interface wave-transmitting properties, and achieves excellent dielectric properties, good continuity and uniformity. , the effect of high flexural strength and fracture toughness

Active Publication Date: 2018-11-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it is not suitable as a wave-transmitting interface material, and there are more free silicon, which has a great impact on the wave-transmitting performance of the interface.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) On the surface of the three-dimensional woven quartz fiber preform, use monomethyltrichlorosilane, boron trichloride and ammonia as the precursor, hydrogen as the carrier gas, and argon as the dilution gas, at 750 ° C, 400 Pa Under the condition of chemical vapor deposition for 5h, a fiber preform with an amorphous SiBNC coating is obtained; wherein the thickness of the amorphous SiBNC coating is 800nm; the molar ratio of monomethyltrichlorosilane, boron trichloride, ammonia, and hydrogen is 3:2:6:10;

[0027] (2) heat-treating the fiber preform with the amorphous SiBNC coating obtained in step (1) at 700° C. for 2 h in an ammonia atmosphere to obtain a fiber preform with a SiBN wave-transparent coating;

[0028] (3) The fiber preform with SiBN wave-transparent coating that step (2) obtains is placed in the borazine precursor containing the silicon nitride nanopowder of 100~200nm in the mass fraction 25%, particle diameter at 5MPa Immerse under pressure for 0.5h, a...

Embodiment 2

[0031] (1) On the surface of the 2.5-dimensional woven silicon nitride fiber preform, dimethyltrichlorosilane, boron trichloride and ammonia are used as precursors, hydrogen is used as a carrier gas, and argon is used as a dilution gas. Chemical vapor deposition at 800°C and 600Pa for 8 hours to obtain a fiber preform with an amorphous SiBNC coating; the thickness of the amorphous SiBNC coating is 1000nm; dimethyltrichlorosilane, boron trichloride, ammonia, hydrogen The molar ratio is 2:2:5:5;

[0032] (2) heat-treating the fiber preform with an amorphous SiBNC coating obtained in step (1) at 800° C. for 2 h in an ammonia atmosphere to obtain a fiber preform with a SiBN wave-transparent coating;

[0033] (3) Place the fiber preform with the SiBN wave-transparent coating obtained in step (2) in a borazine precursor containing 35% by mass fraction and a particle size of silicon nitride nanopowder of 100 to 200 nm at 5 MPa Immerse under pressure for 1 hour, and then put it into ...

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Abstract

The invention relates to a preparation method of a wave-transparent ceramic-base composite material containing a silicon-boron-nitrogen interface. The preparation method comprises the following steps:carrying out chemical vapor deposition on the surface of a wave-transparent ceramic fiber prefabricated component through taking silane, boron trichloride and ammonia gas as precursors, hydrogen as carrier gas and argon as diluent gas, so as to obtain the fiber prefabricated component with an amorphous SiBNC coating layer; carrying out thermal treatment, so as to obtain the fiber prefabricated component with an SiBN wave-transparent coating layer; and putting the fiber prefabricated component into borazine precursor slurry, and carrying out pressure dipping and splitting decomposition, so asto obtain the wave-transparent ceramic-base composite material containing the silicon-boron-nitrogen interface. The prepared wave-transparent ceramic-base composite material containing the silicon-boron-nitrogen interface has high bending strength and breaking tenacity and excellent dielectric property, and a silicon-boron-nitrogen coating layer on the surface has relatively good continuity and uniformity and is unlikely to fall.

Description

technical field [0001] The invention belongs to the technical field of wave-transparent ceramic-based composite materials, and in particular relates to a preparation method of wave-transparent ceramic-based composite materials containing silicon, boron and nitrogen interfaces. Background technique [0002] High-performance wave-transparent materials are widely used in the radio systems of aerospace vehicles such as missiles and satellites. They are multi-functional dielectric materials that protect the communication, telemetry, guidance, and detonation systems of aircraft under harsh environmental conditions. Continuous fiber-reinforced wave-transparent ceramic matrix composites have the advantages of high working temperature, anti-ablation, and stable performance, and have been a research hotspot in the field of high-temperature wave-transparent materials at home and abroad. However, during the high-temperature preparation process of wave-transparent ceramic matrix composit...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/584C04B35/622C04B41/87
CPCC04B35/806C04B35/584C04B35/622C04B41/5062C04B41/87C04B2235/3418C04B2235/3852C04B2235/6562C04B2235/6567C04B2235/661C04B2235/96C04B41/4584C04B41/4531
Inventor 刘勇刘涛王华青刘泽新纪宝明
Owner DONGHUA UNIV
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