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
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AI Technical Summary

Problems solved by technology

The disadvantage is that it is not suitable as a wave-transmitting interface material, and there ar

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] Example 1

[0026] (1) On the surface of the three-dimensional woven quartz fiber preform, use monomethyltrichlorosilane, boron trichloride and ammonia as precursors, hydrogen as carrier gas, and argon as diluent gas, at 750℃, 400Pa Under the conditions of chemical vapor deposition for 5 hours, a fiber preform with amorphous SiBNC coating was obtained; the thickness of the amorphous SiBNC coating was 800 nm; the molar ratio of monomethyltrichlorosilane, boron trichloride, ammonia, and hydrogen was 3:2:6:10;

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

[0028] (3) The fiber preform with SiBN wave-transmitting coating obtained in step (2) is placed in a borazine precursor containing 25% mass fraction of silicon nitride nano-powder with a particle size of 100-200 nm at a temperature of 5 MPa Under pressure immersion for 0.5h, the...

Example Embodiment

[0030] Example 2

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

[0032] (2) Heat the fiber preform with the amorphous SiBNC coating obtained in step (1) at 800°C for 2 hours in an ammonia atmosphere to obtain the fiber preform with the SiBN wave-transmitting coating;

[0033] (3) The fiber preform with SiBN wave-transmitting coating obtained in step (2) is placed in a borazine precursor containing 35% mass fraction of silicon nitride nano-powder with a particle size of 100-200nm at a temperature of 5MPa Under pressure immersion for 1h, then put it in...

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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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