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Silicon carbide ceramic matrix composite reflector and preparation method and application thereof

A technology of silicon carbide ceramic matrix and composite materials, applied in mirrors, instruments, optics, etc., can solve problems such as low strength, achieve low strength, overcome brittleness, and improve optical performance

Active Publication Date: 2021-11-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the above-mentioned technical deficiencies, the present invention provides a silicon carbide ceramic matrix composite reflector and its preparation method and application. The present invention aims to overcome the low strength of sintered silicon carbide and chopped fiber reinforced silicon carbide ceramic matrix composite reflectors. 1. There are a large number of microscopic defects in the reflective mirror of fiber-reinforced silicon carbide ceramic matrix composite material. The present invention proposes a reflector containing continuous fiber reinforced silicon carbide ceramic matrix composite material and its manufacturing method. As the main material of the mirror, the preparation of the mirror surface and the support structure of the mirror is completed through structural design and integrated molding technology, which can not only greatly improve the specific stiffness, strength and thermal stability of the mirror; at the same time, through the surface treatment of the reflective surface, the The problem of microscopic defects on the surface of ceramic matrix composite mirrors is reduced, and the optical reflection performance of the mirror surface is improved; in addition, this technology has unique advantages in the preparation of large-scale mirrors

Method used

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  • Silicon carbide ceramic matrix composite reflector and preparation method and application thereof
  • Silicon carbide ceramic matrix composite reflector and preparation method and application thereof
  • Silicon carbide ceramic matrix composite reflector and preparation method and application thereof

Examples

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Embodiment 1

[0044] A method for preparing a silicon carbide ceramic matrix composite mirror, comprising the steps of:

[0045] The reflective surface and support structure of the reflector structure in this embodiment are processed from the same blank;

[0046] (1) Using continuous carbon fibers to prepare a three-dimensional needle-punched fiber preform according to the mirror structure model, the continuous fiber in the fiber preform accounts for 25 to 30% of the mirror surface of the silicon carbide ceramic matrix composite material;

[0047] (2) Put the fiber prefabricated body prepared in step (1) into the graphite mold for shaping, and put the graphite mold with the fiber prefabricated body into the reaction furnace, and use the first chemical vapor deposition process to complete the fiber prefabricated body interface preparation and SiC ceramic matrix preparation, to obtain a fiber-reinforced SiC ceramic matrix composite reflector blank;

[0048] (21) The interface preparation of ...

Embodiment 2

[0056] A method for preparing a silicon carbide ceramic matrix composite mirror, comprising the steps of:

[0057] The reflector structure of this embodiment includes a reflective surface, a support structure, and multiple connectors. The reflective surface, support structure, and connectors are all made of continuous carbon fiber reinforced silicon carbide ceramic matrix composites. The reflective surface and the support structure are connected by connectors and passed through In-situ homogeneous welding of the third chemical vapor deposition process;

[0058] (1) Using continuous carbon fiber, prepare the corresponding fiber prefabricated body according to the structure model of the reflective surface and the supporting structure. The volume fraction of the mirror surface of the material is 40-48%;

[0059] (2) Put the fiber prefabricated body prepared in step (1) into the graphite mold for shaping, and put the graphite mold with the fiber prefabricated body into the reacti...

Embodiment 3

[0069] A method for preparing a silicon carbide ceramic matrix composite mirror, comprising the steps of:

[0070] The reflector structure of this embodiment includes a reflective surface, a support structure, and multiple connectors. The reflective surface, support structure, and connectors are all made of continuous silicon carbide fiber-reinforced silicon carbide ceramic matrix composites, and the reflective surface and the support structure are connected by connectors. And through the third chemical vapor deposition process in situ homogeneous welding as a whole;

[0071] (1) Continuous silicon carbide fibers are used to prepare corresponding fiber prefabricated bodies according to the structural model of the reflective surface and supporting structure. The fiber prefabricated bodies are stitched by plain weave two-dimensional cloth laminated layers, and the continuous fibers in the fiber prefabricated body account for the silicon carbide ceramics The volume fraction of th...

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Abstract

The invention relates to the technical field of optical reflector structure manufacturing, in particular to a silicon carbide ceramic matrix composite reflector and a preparation method and application thereof. The invention further provides a continuous fiber reinforced silicon carbide ceramic matrix composite reflector surface and a manufacturing method. The continuous fiber reinforced silicon carbide ceramic matrix composite reflector is adopted as a reflector main body material, and preparation of the reflector surface and a supporting structure is completed through structural design and an integrated forming technology, so that the specific stiffness, the strength and the thermal stability of the reflector can be greatly improved; meanwhile, through surface treatment of the reflecting surface, the problem of surface microdefects of the ceramic matrix composite reflector is greatly reduced, and the optical reflecting performance of the mirror surface is improved; and in addition, the technology has unique advantages in the aspect of preparation of large-size reflectors.

Description

technical field [0001] The invention belongs to the technical field of manufacturing optical mirror structures, and in particular relates to a silicon carbide ceramic-based composite material mirror and a preparation method and application thereof. Background technique [0002] Since the 21st century, due to the rapid development of fields such as earth observation and deep space exploration, higher and higher requirements have been put forward for the observation capabilities of photoelectric imaging systems. As an important component, optical mirrors have been widely used by scientific researchers. focus on. For the selection and preparation of high-performance optical mirror materials, the following main properties generally need to be paid attention to: [0003] (1) Choose low-density materials; on the one hand, it can meet the low weight requirements of space remote sensing cameras for payloads, which can reduce the cost of satellite launches; on the other hand, it can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/573C04B35/577C04B35/80C04B35/622C04B41/87C04B41/85G02B5/08G02B1/00G02B7/182
CPCC04B35/573C04B35/80C04B35/622C04B41/87C04B41/85C04B41/5057C04B41/5096G02B5/0808G02B1/00G02B7/182C04B2235/5248C04B2235/5244C04B2235/614C04B2235/77C04B2235/96C04B2235/9607C04B41/4523C04B41/4529C04B41/4527
Inventor 刘持栋刘小冲付志强张晰王鹏霍达成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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