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.
CN112010654AActive Publication Date: 2020-12-01AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
Publication Date
2020-12-01

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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.
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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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