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High-temperature-resistant wave-transparent silicon nitride fiber-reinforced composite material and preparation method thereof

A technology for reinforcing composite materials and silicon nitride fibers, which is applied in the field of high temperature-resistant wave-transmitting silicon nitride fiber reinforced composite materials and its preparation, can solve the problems such as unreported development technology of composite materials, and achieve good high-temperature structural reliability, Good mechanical properties and the effect of preventing damage

Active Publication Date: 2015-01-07
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For continuous silicon nitride fiber-reinforced composite materials, since there is no continuous fiber in China, the development technology of composite materials has not been reported, and due to the sensitivity of materials, there have been no relevant technical reports abroad.

Method used

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  • High-temperature-resistant wave-transparent silicon nitride fiber-reinforced composite material and preparation method thereof
  • High-temperature-resistant wave-transparent silicon nitride fiber-reinforced composite material and preparation method thereof

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preparation example Construction

[0048] Step (3), preparation of the boron nitride interface: the interface between the silicon nitride fiber and the silicon-boron-nitride composite ceramic is coated with boron nitride, and the interface is prepared by dipping and quasi-cracking the liquid polyborazane precursor. The fabric is impregnated with liquid polyborazane precursor, and a continuous and dense boron nitride thin layer is formed on the surface of the fiber through semi-ceramicization, and the composition is BN 0.75 ~ 1.25 , this process is called quasi-cleavage.

[0049] (1) Place the heat-treated silicon nitride fiber preform in liquid polyborazane for vacuum impregnation, wherein the number average molecular weight of the liquid polyborazane precursor at room temperature is 500-800, and the viscosity is 50-300mPa ·s, the vacuum degree of immersion is 10Pa~200Pa, and the immersion time is 2~8h.

[0050] (2) Conduct semi-ceramic quasi-cracking of the silicon nitride preform impregnated with liquid pol...

Embodiment 1

[0059] (1), the continuous silicon nitride fiber preform of three-dimensional four-way weaving is used as a reinforcement, and the volume content of the fiber is 45%;

[0060] (2) Put the silicon nitride fiber prefabricated body prepared in step (1) into a muffle furnace for purification heat treatment, the heat treatment temperature is 500°C, and the heat treatment time is 2h;

[0061] (3) Place the silicon nitride fiber preform after the heat treatment in step (2) into liquid polyborazane for vacuum impregnation, wherein the number average molecular weight of the liquid polyborazane precursor at room temperature is 674, and the viscosity is 135mPa s, the impregnation vacuum is 133Pa, and the impregnation time is 3h;

[0062] (4) Perform quasi-cracking of the silicon nitride prefabricated body impregnated with liquid polyborazane in step (3) under the atmosphere of ammonia gas, the temperature is 450°C, the heating rate is 2.0°C / min, and the flow rate of ammonia gas is contro...

Embodiment 2

[0074] (1), using the continuous silicon nitride fiber prefabricated body of the two-dimensional cloth layer as the reinforcement, the volume content of the fiber is 38%;

[0075] (2) Put the silicon nitride fiber prefabricated body prepared in step (1) into a muffle furnace for purification heat treatment, the heat treatment temperature is 700°C, and the heat treatment time is 1.5h;

[0076] (3) Place the silicon nitride fiber preform after the heat treatment in step (2) into liquid polyborazane for vacuum impregnation, wherein the number average molecular weight of the liquid polyborazane precursor at room temperature is 748, and the viscosity is 210mPa s, the impregnation vacuum is 133Pa, and the impregnation time is 5h;

[0077] (4) Perform quasi-cracking of the silicon nitride prefabricated body impregnated with liquid polyborazane in step (3) under the atmosphere of ammonia gas, the temperature is 550°C, the heating rate is 0.5°C / min, and the flow rate of ammonia gas is ...

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Abstract

The invention relates to a high-temperature-resistant wave-transparent silicon nitride fiber-reinforced composite material and a preparation method thereof. The method comprises the following steps: by using a two-dimensional fabric laying or three-dimensional four-direction knitted continuous silicon nitride fiber preform as a reinforcing body, carrying out interface coating preparation on the reinforcing body fiber surface with a polyboron azane precursor by half-vitrification; compounding the precursor mainly composed of polyboron azane with an impregnation liquid to prepare a base; and carrying out vacuum pressure impregnation, desolventization, pressure crosslinking curing and cracking densification to obtain the final silicon nitride fiber-reinforced composite material. The preparation method greatly enhances the impregnation efficiency, enhances the material density by 18-40%, and finally obtains the novel wave-transparent material system with excellent high temperature resistance. The strength retention rate of the material at 1200 DEG C and 1500 DEG C is 70-94%. Compared with the silicon nitride ceramic material, the novel wave-transparent material has obviously higher breaking strain.

Description

technical field [0001] The invention relates to the field of ceramic-based composite material manufacturing, in particular to a high-temperature-resistant wave-transmitting silicon nitride fiber-reinforced composite material and a preparation method thereof. Background technique [0002] As the requirements for materials in aerospace, metallurgy, automobile industry, nuclear industry and other fields are developing in the direction of light weight, high strength and toughness, high reliability, and high temperature resistance, continuous fiber reinforced ceramic matrix composites have It has very good structural reliability, and has the characteristics of low density and high damage tolerance, and has attracted more and more attention. In particular, the radome materials that assist missiles to complete tasks such as homing, guidance, communication, and detonation have high requirements for materials such as high temperature resistance, ablation resistance, dielectric and me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/622
CPCC04B35/58C04B35/806C04B2235/386C04B2235/524C04B2235/616
Inventor 孙妮娟范锦鹏张大海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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