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High temperature resistant broadband wave-transparent ceramic matrix composite and preparation method thereof

A composite material and ceramic-based technology, which is applied in the field of ceramic-based composite materials and its preparation, can solve the problems of unsatisfactory broadband transmission characteristics, large dielectric constant, and high cost, and achieve excellent ablation resistance and cracking temperature Low, the effect of reducing energy consumption and cost

Active Publication Date: 2012-08-22
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the types of wave-transparent ceramic fibers, so far, fiber-reinforced ceramic-based wave-transparent composites mainly include quartz fiber-reinforced quartz ceramic matrix composites, quartz fiber-reinforced phosphate composites, and quartz fiber-reinforced nitride ceramic matrix. Composite materials, and the current preparation of these composite materials are made of solid quartz fiber, its dielectric constant is still too large, broadband wave transmission characteristics are still not ideal
[0008] The sintering process for the preparation of existing ceramic materials needs to be carried out at high temperature, and sintering aids must be added, which leads to high energy consumption and high cost

Method used

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  • High temperature resistant broadband wave-transparent ceramic matrix composite and preparation method thereof
  • High temperature resistant broadband wave-transparent ceramic matrix composite and preparation method thereof
  • High temperature resistant broadband wave-transparent ceramic matrix composite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The reinforcing phase of the wave-transparent ceramic matrix composite material in this embodiment is hollow quartz fiber, and the matrix is ​​carbon-free boron nitride (BN). The apparent volume fraction of the hollow quartz fiber is about 40%, and the actual fiber volume fraction is About 32% (because the quartz fiber has a hollow core), the volume fraction of the boron nitride is about 40%; the rest is pores.

[0031] preparation:

[0032] (1) Preparation of hollow quartz fiber preform

[0033] The high-purity hollow silica fiber (SiO in the fiber 2 content greater than 99.9wt%) woven into flat-shaped prefabricated parts, weaving method: 2.5-dimensional structure, fiber apparent volume fraction is about 40%, considering the hollowness of the fiber, the actual fiber volume fraction is about 32%; yarn specification 300tex, the linear densities of warp and weft are 10 threads / cm and 5 threads / cm respectively;

[0034] (2) Pretreatment of hollow quartz fiber preforms ...

Embodiment 2

[0040] The actual volume fraction of the hollow core quartz fiber of the wave-transparent ceramic matrix composite material in this embodiment is about 24% (because the quartz fiber has a hollow core), and the volume fraction of the matrix boron nitride is about 42%; the remainder is pores.

[0041] preparation:

[0042] (1) High-purity hollow silica fiber (SiO 2 Content greater than 99.9%) prepared into felt prefabricated flat panels (such as Figure 5 shown), the fiber apparent volume fraction is about 30%, and the actual fiber volume fraction is about 24%;

[0043] (2) Place the hollow quartz fiber preform obtained in step (1) in an impregnation tank, add acetone to immerse the fiber preform, close the impregnation tank, then place the impregnation tank in an oil bath, heat to 60°C and cook 5 hours; then it is cooled to room temperature and the acetone is taken out, then heated and vacuum-dried the fiber preform; so repeated 4 times until the acetone discharged after clea...

Embodiment 3

[0048] In this embodiment, the actual volume fraction of the hollow core quartz fiber of the wave-transparent ceramic matrix composite material is about 32% (because the quartz fiber has a hollow core), and the volume fraction of the matrix boron nitride is about 42%; the remainder is pores.

[0049] preparation:

[0050] (1) Same as the embodiment step (1)

[0051] (2) Place the hollow quartz fiber preform obtained in step (1) in an impregnation tank, add acetone to immerse the fiber preform, close the impregnation tank, then place the impregnation tank in an oil bath, heat to 60°C and cook 4 hours; then it was cooled to room temperature and the acetone was taken out, then heated and vacuum-dried the fiber preform; so repeated 4 times until the acetone discharged after cleaning was no longer turbid;

[0052] (3) After drying the pretreated fiber preform, put it into the impregnation tank, vacuumize the impregnation tank and inhale the carbon-free BN ceramic precursor until i...

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Abstract

The invention provides a high temperature resistant broadband wave-transparent ceramic matrix composite and a preparation method thereof. The composite is characterized in that the reinforcing phase is tubular quartz fiber with volume fraction being 20-35%; the matrix is carbon-free boron nitride with volume fraction being 35-45%; and the rest are holes. The preparation method comprises the following steps: (1) braiding the high-purity tubular quartz fiber into a 2.5-dimensional or 3-dimensional structural fabric preform or preparing the high-purity tubular quartz fiber into a felt preform; (2) pretreating the tubular quartz fiber preform with acetone; and (3) carrying out soaking with boron nitride precursor and cracking conversion. The composite has the characteristics of high strength,low dielectric constant, excellent thermophysical property and the like and the preparation process has the advantages of simpleness and low energy consumption and cost.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, in particular to a ceramic matrix composite material with the functions of heat protection, load bearing and broadband wave transmission and a preparation method thereof. Background technique [0002] In the past 20 years, driven by the demand for precision-guided aircraft, precision-guided technology has developed rapidly. With the advancement of propulsion technology, the flight speed and reentry speed of the aircraft are getting higher and higher. Some aircraft fly at speeds exceeding Mach 4 (Ma) in the atmosphere for hundreds of seconds, which makes the aerodynamic pressure on the surface of the aircraft The load and air heat are becoming more and more serious, which makes the electromagnetic guidance device of the aircraft put forward higher requirements on the heat resistance and load-bearing performance of the material for its protective parts - radome...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80
Inventor 王思青张长瑞曹峰李斌胡海峰邹晓蓉宋阳曦
Owner NAT UNIV OF DEFENSE TECH
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