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A sibn fiber reinforced sio 2 -bn-al 2 o 3 Preparation method of wave-transparent composite material

A composite material and fiber-reinforced technology, which is applied in the field of preparation of wave-transmitting composite materials, can solve the problems of low high-temperature mechanical properties and anti-scouring properties of composite materials, damage to the mechanical properties of quartz fibers, and low strength of composite materials, and achieve high-temperature burning resistance. Corrosion and erosion resistance, low cost, excellent dielectric properties

Active Publication Date: 2020-05-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN102167609A (published on August 31, 2011) discloses a quartz / quartz-boron nitride high-temperature wave-transmitting material and its preparation method. The method is based on quartz fiber fabric and SiO 2 Sol is used as raw material, and the sol-gel process is used to prepare quartz / quartz ceramic blanks, and then the quartz / quartz ceramic blanks, boric acid, urea and ethanol are used as raw materials, vacuum impregnated and pressureless sintered to obtain quartz / quartz-nitrogen Boron high-temperature wave-transmitting material. The advantage of this method is that the obtained composite material has good ablation resistance and excellent dielectric properties. The disadvantage is that the sintering temperature is high, the mechanical properties of the quartz fiber are seriously damaged, and the strength of the composite material is low at high temperature.
The advantage of this method is that the process is relatively simple, low cost, good toughness and excellent dielectric properties, and the disadvantage is that the high-temperature mechanical properties and erosion resistance of the composite material are low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) SiBN fibers are made into a 3-dimensional braided preform structure, and the fiber volume fraction of the preform is 35%;

[0025] (2) on SiO 2 Add nano-BN powder and nano-Al to silica sol with a mass percentage of 20% 2 o 3 Powder, among them, silica sol, nano BN powder and nano Al 2 o 3 The mass ratio of the powder is 10:2:1, and the mixed slurry is obtained after uniform stirring, and the SiO in the silica sol 2 The average particle size of the particles is 10-15nm, the average particle size of the added nano-BN is 100-200nm, and the nano-Al 2 o 3 The average particle size of 30 ~ 60nm.

[0026] (3) Place the SiBN fiber preform in the mixed slurry for vacuum impregnation, and the impregnation pressure is 20KPa;

[0027] (4) The SiBN fiber prefabricated part impregnated with the slurry is placed in a drying oven to perform a drying process. The drying process is to rise from room temperature to 100°C at a heating rate of 0.5°C per minute, and then hold at ...

Embodiment 2

[0034] (1) SiBN fibers are made into a 3D braided preform structure, and the fiber volume fraction of the preform is 40%;

[0035] (2) on SiO 2 Add nano-BN powder and nano-Al to silica sol with a mass percentage of 25% 2 o 3 Powder, among them, silica sol, nano BN powder and nano Al 2 o 3 The mass ratio of the powder is 8:3:1, and the mixed slurry is obtained after uniform stirring, and the SiO in the silica sol 2 The average particle size of the particles is 10-15nm, the average particle size of the added nano-BN is 100-200nm, and the nano-Al 2 o 3 The average particle size of 30 ~ 60nm.

[0036] (3) Place the SiBN fiber preform in the mixed slurry for vacuum impregnation, and the impregnation pressure is 35KPa;

[0037] (4) The SiBN fiber prefabricated part impregnated with the slurry is placed in a drying oven to perform a drying process. The drying process is to rise from room temperature to 110°C, the heating rate is 0.5°C per minute, and then keep at 130°C for 30...

Embodiment 3

[0044] (1) SiBN fibers are made into a 2.5-dimensional woven preform structure, and the fiber volume fraction of the preform is 45%;

[0045] (2) on SiO 2 Add nano-BN powder and nano-Al to silica sol with a mass percentage of 30% 2 o 3 Powder, among them, silica sol, nano BN powder and nano Al 2 o 3 The mass ratio of the powder is 12:2:1, and the mixed slurry is obtained after uniform stirring, and the SiO in the silica sol 2 The average particle size of the particles is 10-15nm, the average particle size of the added nano-BN is 100-200nm, and the nano-Al 2 o 3 The average particle size of 30 ~ 60nm.

[0046] (3) Place the SiBN fiber preform in the mixed slurry for vacuum impregnation, and the impregnation pressure is 45KPa;

[0047] (4) The SiBN fiber prefabricated part impregnated with the slurry is placed in a drying oven to perform a drying process. The drying process is to rise from room temperature to 115°C, the heating rate is 1°C per minute, and then keep at 13...

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Abstract

The invention relates to a preparation method of a SiB fiber-enhanced SiO-BN-Al2O3 wave-transparent composite material. The preparation method comprises the following steps: adding nano BN powder and nano Al2O3 powder into silica sol, uniformly stirring to obtain mixed slurry; putting a SiBN fiber prefabricated part into the mixed slurry to carry out vacuum impregnation with the impregnation pressure of 20KPa-60KPa, then carrying out drying and sintering treatment and obtaining a composite material after sintering treatment; putting the composite material after sintering treatment into the mixed slurry to carry out pressure impregnation with the impregnation pressure of 2-8MPa, and then carrying out drying and sintering treatment; repeating for 4-6 times and thus obtaining the SiB fiber-enhanced SiO-BN-Al2O3 wave-transparent composite material. The preparation method is simple in process, easy in operation and low in cost, and the composite material is high in density, excellent in dielectric property and strong in high-temperature erosion resistance and scouring resistance.

Description

technical field [0001] The invention belongs to the field of preparation of wave-transparent composite materials, in particular to a SiBN fiber reinforced SiO 2 -BN-Al 2 o 3 Preparation method of wave-transparent composite material. Background technique [0002] The wave-transparent material is a multifunctional dielectric material used for the antenna window / cover of the aircraft to protect it from completing tasks such as communication, telemetry, and guidance in harsh service environments. Quartz fiber reinforced quartz wave-transparent composite material has the advantages of strong ablation resistance, low thermal conductivity and good dielectric properties, and is one of the commonly used high-temperature wave-transparent composite materials. However, quartz fiber-reinforced quartz wave-transparent composite materials also have disadvantages such as low density, high porosity, and easy moisture absorption. The toughening effect is weakened, and the strength of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/3418C04B2235/386C04B2235/96C04B2235/77C04B2235/6562C04B2235/6567
Inventor 刘勇崔永杰彭帅常雪峰张晨宇韩克清余木火
Owner DONGHUA UNIV