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Alumina fiber reinforced nitride based wave permeable composite material and preparation method thereof

A technology of alumina fiber and composite materials, which is applied in the field of alumina fiber-reinforced nitride-based wave-transparent composite materials and its preparation, can solve the problems of unreported high-temperature mechanical properties, complicated and time-consuming three-dimensional weaving process, and poor overall mechanical properties of materials To achieve the effects of improving cross-linking curing efficiency, reducing air pressure, improving high-temperature mechanical properties and dielectric properties

Active Publication Date: 2018-05-04
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reinforcements used in these reports are all unidirectionally laid alumina fibers or three-dimensional braided pieces, and the overall mechanical properties of the materials prepared by one-way laying are poor, and the three-dimensional weaving process is more complicated and time-consuming; in addition, the prepared materials are intermediate The electrical constant is too large (6-7), and the high-temperature mechanical properties have not been reported

Method used

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  • Alumina fiber reinforced nitride based wave permeable composite material and preparation method thereof
  • Alumina fiber reinforced nitride based wave permeable composite material and preparation method thereof
  • Alumina fiber reinforced nitride based wave permeable composite material and preparation method thereof

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Embodiment 1

[0032] A preparation method of alumina fiber reinforced nitride-based wave-transparent composite material of the present invention, comprising the following steps:

[0033] (1) Laminate and compact the alumina two-dimensional fiber cloth, and stitch the alumina fiber along the longitudinal direction (stacking direction) to make the alumina three-dimensional fiber prefabricated part. The volume fraction of the alumina fiber is 38vol%, and the density of the longitudinal stitching is 2×2 needles / cm 2 ;

[0034] (2) The aluminum oxide three-dimensional fiber preform obtained in step (1) is subjected to debinding treatment. The debinding process is as follows: the temperature is raised to 800°C at a rate of 10°C / min, and the temperature is kept for 5 hours;

[0035] (3) Put the degummed fiber preform obtained in step (2) into an airtight container, evacuate the container to below 500Pa, inhale an appropriate amount of liquid borazine precursor, and let it stand for 60 minutes to ...

Embodiment 2

[0043] A preparation method of alumina fiber reinforced nitride-based wave-transparent composite material of the present invention, comprising the following steps:

[0044] (1) Laminate and compact the alumina two-dimensional fiber cloth, and stitch the alumina fiber along the longitudinal direction (stacking direction) to make the alumina three-dimensional fiber prefabricated part, wherein the volume fraction of the alumina three-dimensional fiber is 42vol%, and the longitudinal stitching The density is 2×2 needles / cm 2 ;

[0045] (2) The aluminum oxide three-dimensional fiber preform obtained in step (1) is subjected to debinding treatment. The debinding process is as follows: the temperature is raised to 800°C at a rate of 10°C / min, and the temperature is kept for 5 hours;

[0046] (3) Put the alumina three-dimensional fiber prefabricated part after degumming obtained in step (2) into a closed container, vacuum the container below 500Pa, inhale an appropriate amount of liq...

Embodiment 3

[0051] A preparation method of alumina fiber reinforced nitride-based wave-transparent composite material of the present invention, comprising the following steps:

[0052] (1) Laminate and compact the alumina two-dimensional fiber cloth, and stitch the alumina fiber along the longitudinal direction (stacking direction) to make the alumina three-dimensional fiber prefabricated part. The volume fraction of the alumina three-dimensional fiber is 40vol%, and the density of the longitudinal stitching is 2×2 stitches / cm 2 ;

[0053] (2) The aluminum oxide three-dimensional fiber preform obtained in step (1) is subjected to debinding treatment. The debinding process is as follows: the temperature is raised to 800°C at a rate of 10°C / min, and the temperature is kept for 5 hours;

[0054] (3) Put the alumina three-dimensional fiber prefabricated part after degumming obtained in step (2) into a closed container, vacuum the container below 500Pa, inhale an appropriate amount of liquid ...

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Abstract

The invention discloses an alumina fiber reinforced nitride based wave permeable composite material and a preparation method thereof. The preparation method comprises the following steps: (1) performing soaking, namely performing vacuum soaking on a degummed alumina three-dimensional fiber prefabricated part in borazine; (2) performing cross-linking curing, namely performing cross-linking curing on liquid borazine in pores of the soaked alumina fiber prefabricated part in a cross-linking curing atmosphere according to set cross-linking curing principles; (3) performing pyrolysis, namely performing pyrolysis on the cross-linked alumina fiber prefabricated part in vacuum or a pyrolysis atmosphere, converting borazine into nitride ceramic, and cooling according to set cooling principles; and(4) repeating steps (1)-(3) of soaking, cross-linking curing and pyrolysis for multiple times. The alumina fiber reinforced nitride based wave permeable composite material disclosed by the invention has the advantages of being excellent in high-temperature resistance and dielectric property, good in process property, and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of continuous fiber-reinforced ceramic-based composite materials, and relates to an alumina fiber-reinforced nitride-based wave-transparent composite material and a preparation method thereof. Background technique [0002] The rapid development of high Mach number long-endurance missiles and reusable aircraft has put forward an urgent need for radome (antenna window) materials that can withstand high temperatures for a long time and transmit waves. Nitride ceramic matrix composites have excellent thermal stability. , thermal shock resistance, dielectric properties and ablation resistance, becoming one of the most promising candidate materials. As a high-temperature-resistant wave-transparent reinforcement material, quartz fiber is currently the fiber with the highest commercialization degree and output, but it has serious crystallization problems at high temperatures. In contrast, alumina fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/622C04B35/583C04B35/58
CPCC04B35/58C04B35/583C04B35/622C04B35/806C04B2235/5224C04B2235/616
Inventor 李端李斌陈永波高世涛杨雪金郑远义
Owner NAT UNIV OF DEFENSE TECH
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