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Fiber-reinforced silicon nitride composite material and preparation method thereof

A composite material and fiber reinforced technology, which is applied in the field of fiber reinforced silicon nitride composite materials, can solve the problems of removing surface cured products, etc., and achieve the effects of simple operation, simple process flow, and improved feasibility.

Active Publication Date: 2020-12-01
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved in the present invention is that when preparing silicon nitride fiber-reinforced silicon nitride composite materials, after the polysilazane curing reaction in the PIP process, in the process of degumming the polysilazane cured product on the surface of the composite material, Problems such as the inability to remove solidified matter on the surface of the fiber preform without affecting the state of the fiber preform itself

Method used

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  • Fiber-reinforced silicon nitride composite material and preparation method thereof
  • Fiber-reinforced silicon nitride composite material and preparation method thereof
  • Fiber-reinforced silicon nitride composite material and preparation method thereof

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preparation example Construction

[0024] The present invention provides a kind of preparation method of fiber-reinforced silicon nitride composite material in the first aspect, and described preparation method comprises the following steps:

[0025] (1) Using silicon nitride fibers to prepare fiber preforms, and then using polysilazane to impregnate the fiber preforms to obtain impregnated fiber preforms;

[0026] (2) Carry out the initial curing reaction at the first curing temperature to the impregnated fiber preform described in step (1), and when the polysilazane changes from a fluid state to a semi-fluid state, continue to react at the first curing temperature Keeping warm until the polysilazane is jelly-like to obtain an initially cured fiber preform with a polysilazane cured product on the surface;

[0027] (3) removing the cured polysilazane on the surface of the initially cured fiber preform, and then performing a secondary curing reaction on the fiber preform at a second curing temperature to obtain ...

Embodiment 1

[0042] The silicon nitride fiber is processed into a fiber preform with a fiber volume content of 40% by weaving, which is used in the subsequent impregnation step, and the size of the fiber preform is 20cm*20cm*15mm. Vacuum impregnation method is used to impregnate the fiber preform, put the fiber preform fully impregnated with polysilazane into the oven, select 150°C as the first curing temperature, and react for 2 hours, until the polysilazane cured product changes from fluid state to In the semi-fluid state, continue to keep warm for 5 minutes. After taking it out, manually remove the jelly-like solidified material on the surface of the fiber preform, then put it into the oven, select 200°C as the second curing temperature, and keep it at this curing temperature for 4 hours to make polysilicon The azane is completely cured, and then it is taken out of the oven. At this time, the surface of the fiber preform is not covered with excess polysilazane cured material, and the pol...

Embodiment 2

[0044] Embodiment 2 is basically the same as Embodiment 1, except that the size of the fiber preform is 30cm*30cm*20mm.

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Abstract

The invention relates to a preparation method of a fiber-reinforced silicon nitride composite material. The preparation method comprises the following steps: (1) preparing a fiber preform from siliconnitride fibers, and carrying out impregnation treatment on the fiber preform by polysilazane to obtain an impregnated fiber preform; (2) carrying out an initial curing reaction on the impregnated fiber preform at a first curing temperature, and when the polysilazane is changed from a flowing state to a semi-flowing state, continuing to carry out heat preservation at the first curing temperature until the polysilazane is in a jelly state, so as to obtain an initial cured fiber preform; (3) removing the polysilazane cured product on the surface of the initially cured fiber preform, and carryingout secondary curing reaction on the fiber preform at a second curing temperature to obtain a secondary cured fiber preform; (4) carrying out cracking reaction on the secondary cured fiber preform toobtain a cracked fiber preform; and (5) repeating steps (1) to (4) on the cracked fiber preform for at least one time.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a novel curing treatment method for polysilazane in a fiber-reinforced silicon nitride composite material prepared by a PIP process and a fiber-reinforced silicon nitride composite material prepared by the method. Background technique [0002] With the development of various new types of aircraft towards higher speeds and longer flight times, higher requirements are put forward for high-performance wave-transparent materials that integrate high-temperature resistance, wave-transmission, and load-carrying functions. It can withstand greater loads and thermal shocks without damage at operating temperatures and harsher environments, while meeting electrical performance characteristics. Ceramic materials have good heat resistance, heat insulation, mechanical and dielectric properties, and have always been the first choice for high-temperature resistant wave-tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/589C04B35/596C04B35/622C04B35/80
CPCC04B35/589C04B35/622C04B2235/77C04B2235/96C04B2235/616C04B2235/658C04B2235/656C04B2235/6567C04B2235/524
Inventor 韩耀张冰清苗镇江王华栋董衡孙志强张剑吕毅
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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