Antioxidant fiber-reinforced silicon-boron-nitrogen composite material and preparation method and application thereof

A fiber-reinforced and composite material technology, which is applied in the field of composite materials, can solve the problems of insufficient surface structure and poor oxidation resistance, and achieve the effects of good interface bonding, good high temperature resistance and oxidation resistance, and uniform pores

Inactive Publication Date: 2021-12-24
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the surface structure of existing materials is not dense enough, and the oxidation resistance is poor. Aiming at the defects in the prior art, an anti-oxidation fiber reinforced silicon-boron-nitrogen composite material and its preparation method and application are provided , to improve the compactness and oxidation resistance of the composite

Method used

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  • Antioxidant fiber-reinforced silicon-boron-nitrogen composite material and preparation method and application thereof
  • Antioxidant fiber-reinforced silicon-boron-nitrogen composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The silicon nitride fiber is processed into a preform with a fiber volume content of 40% by weaving.

[0058] Then the precursor is used to impregnate the preform by vacuum impregnation method, and then the crosslinking and curing reaction under nitrogen atmosphere (220°C for 10h) and the cracking reaction under ammonia atmosphere (900°C for 3h) are carried out to make the matrix and the preform The cross-links are gradually integrated. Repeat the immersion, curing and cracking of the precursor three times to obtain the green body.

[0059] Finally, the green body is impregnated by vacuum impregnation method without using silica sol, and the density at room temperature is 1.63g / cm 3 , A composite material with a weight gain rate of 14.8% after oxidation treatment in an air atmosphere at 1200°C for 1 hour.

Embodiment 2

[0061] The silicon nitride fiber is processed into a preform with a fiber volume content of 40% by weaving.

[0062] Then use the precursor to impregnate the preform by vacuum impregnation method, and then carry out the crosslinking and curing reaction under nitrogen atmosphere (220°C for 10h) and the cracking reaction under ammonia atmosphere (900°C for 3h), so that the gap between the matrix and the preform is Cross-linking occurs and gradually merges into one. Repeat the immersion, curing and cracking of the precursor three times to obtain the green body.

[0063] Finally, the silica sol with a solid content of 30wt.% is used to impregnate the green body by vacuum impregnation, the surface of the green body is filled and densified, and then dried (after 6 hours at 80°C, and then adjusted to 160°C for 3 hours) ), the density at normal temperature is 1.79g / cm 3 , A composite material with a weight gain rate of 7.9% after oxidation treatment in an air atmosphere at 1200°C fo...

Embodiment 3

[0065] The silicon nitride fiber is processed into a preform with a fiber volume content of 40% by weaving.

[0066] Then use the precursor to impregnate the preform by vacuum impregnation method, and then carry out the crosslinking and curing reaction under nitrogen atmosphere (10h at 220°C) and the cracking reaction under ammonia atmosphere (3h at 900°C), so that the gap between the matrix and the preform is Cross-linking occurs and gradually merges into one. Repeat the immersion, curing and cracking of the precursor three times to obtain the green body.

[0067] Finally, the silica sol with a solid content of 40wt.% is used to impregnate the green body by vacuum impregnation method, the surface of the green body is filled and densified, and then dried (6h at 80°C and then adjusted at 160°C for 3h), Get a density of 1.84g / cm at room temperature 3 , A composite material with a weight gain rate of 6.3% after oxidation treatment at 1200°C for 1 hour.

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Abstract

The invention relates to the technical field of composite materials, in particular to an antioxidant fiber-reinforced silicon-boron-nitrogen composite material and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a prefabricated body from silicon nitride fibers; (2) impregnating the preform obtained in the step (1) with a precursor, then carrying out a cross-linking curing reaction, and finally cracking; (3) repeating the step (2) for at least three times to obtain a green body; and (4) carrying out at least one silica sol dipping and gelation drying process on the green body obtained in the step (3), and further carrying out heat treatment to obtain the antioxidant fiber-reinforced silicon-boron-nitrogen composite material. The density of the prepared silicon-boron-nitrogen composite material is 1.79-1.95 g / cm < 3 >, the weight gain rate is 2.6-7.9% after oxidation treatment is carried out for 1 h in the air atmosphere at the temperature of 1200 DEG C, and the silicon-boron-nitrogen composite material has good compactness and high temperature resistance and oxidation resistance.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to an anti-oxidation fiber-reinforced silicon-boron-nitrogen composite material and its preparation method and application. Background technique [0002] With the development of various new types of aircraft to higher speeds, higher requirements are placed on high-temperature-resistant wave-transparent materials. Ceramic materials are the first choice for high-temperature-resistant wave-transmitting materials in the aerospace field because of their good heat resistance, heat insulation properties, and mechanical properties. Traditional quartz ceramics have a low operating temperature and cannot meet the requirements of higher-speed aircraft. Low-dielectric nitride ceramics such as silicon nitride and boron nitride have become ideal candidate materials for a new generation of high-temperature wave-transmitting materials because they can withstand higher temperatures, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/84C04B35/58C04B35/622C04B41/85
CPCC04B35/80C04B35/58C04B35/622C04B41/85C04B41/009C04B41/5035C04B2235/483C04B2235/486C04B2235/77C04B2235/9684C04B2235/96C04B41/4539C04B41/0072
Inventor 张冰清韩耀苗镇江张剑吕毅张昊赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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