Preparation method of wave-transparent fiber toughened boron nitride ceramic based wave-transparent composite material

A technology of fiber toughening and composite materials, which is applied in the field of preparation of wave-transparent fiber-toughened boron nitride ceramic-based wave-transparent composite materials, which can solve the problems of high preparation temperature, low ceramicization degree and low density of the substrate, and reduce the Preparation temperature, excellent wave-transmitting performance, and the effect of reducing damage

Inactive Publication Date: 2013-08-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of high preparation temperature, low ceramicization degree and low density of the matrix of fiber-toughened boron nitride ceramic matrix composites

Method used

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  • Preparation method of wave-transparent fiber toughened boron nitride ceramic based wave-transparent composite material
  • Preparation method of wave-transparent fiber toughened boron nitride ceramic based wave-transparent composite material
  • Preparation method of wave-transparent fiber toughened boron nitride ceramic based wave-transparent composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Put 20 pieces of 10cm×10cm×0.01cm glass fiber square cloth (0° / 90°) into a sealed autoclave filled with acetone, heat to 100°C, and keep it warm for 1h. Then put it in a muffle furnace (air atmosphere), raise it to 400°C, and keep it warm for 2h.

[0021] (2) The pretreated fiber prefabricated body is layered and formed in a graphite fixture, placed in a BN chemical vapor infiltration furnace, and BCl is introduced at the same time 3 , NH 3 , Ar and H 2 . BCl 3 The flow rate is 40ml / min, NH 3 Flow rate is 70ml / min, Ar flow rate is 50ml / min, H 2 The flow rate is 110ml / min. Keep the pressure in the furnace at 1kPa, deposit the BN matrix in the temperature range of 650°C, and the deposition time is 150h. The waste materials around the material are cut off and cleaned to obtain the glass fiber reinforced BN matrix composite material.

[0022] It is measured that the composite material whose prepared glass fiber is the reinforcement body density is 1.56g / cm 3 . ...

Embodiment 2

[0025] (1) Preform the glass fiber 2.5D fiber. Put it into a sealed autoclave filled with acetone, heat to 80°C, and keep it warm for 2h. Then place it in a muffle furnace (air atmosphere), raise it to 400°C, and keep it warm for 2h.

[0026] (2) Put the pretreated fiber preform into the BN chemical vapor infiltration furnace, using BCl 3 -NH 3 -Ar-H 2 system. A relatively small flow rate is used to slow down the deposition rate and improve permeability, and the gas flow rates are 20ml / min, 40ml / min, 40ml / min, and 90ml / min, respectively. Keep the pressure in the furnace at 1kPa, deposit the BN matrix in the temperature range of 650°C, and the deposition time is 180h. The waste materials around the material are cut off and cleaned to obtain the glass fiber reinforced BN matrix composite material.

[0027] Measure the average bulk density and process the sample into a disk with a diameter of 50mm and a thickness of 4mm. The relative permittivity of the material is measured...

Embodiment 3

[0030] (1) The glass fiber three-dimensional fiber prefabricated body. Put it into a sealed autoclave filled with acetone, heat to 80°C, and keep it warm for 2h. Then place it in a muffle furnace (air atmosphere), raise it to 400°C, and keep it warm for 2h.

[0031] (2) Put the pretreated fiber preform into the BN chemical vapor infiltration furnace, using BCl 3 -NH 3 -Ar-H 2 system. The gas flow rates are 10ml / min, 30ml / min, 30ml / min, 70ml / min respectively. Keep the pressure in the furnace at 7kPa, deposit the BN matrix in the temperature range of 650°C, and the deposition time is 200h. The waste materials around the material are cut off and cleaned to obtain the glass fiber reinforced BN matrix composite material.

[0032] Measure the average bulk density and process the sample into a disc with a diameter of 50mm and a thickness of 4mm. The relative permittivity of the material is measured by the resonant cavity method. The measured volume density of the three-dimensi...

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Abstract

The invention relates to a method for preparing a wave-transparent fiber toughened boron nitride ceramic based wave-transparent composite material through a chemical gas-phase permeation method, which comprises the following steps: removing impurities from a wave-transparent fiber fabric used as a preform through an acetone cleaning and in-air heat treatment method; and preparing a BN (boron nitride) matrix through a chemical gas-phase permeation process by using a BCl3-NH3-Ar-H2 precursor gas system. The chemical gas-phase deposition method used by the method provides a new idea for the preparation of the wave-transparent fiber toughened boron nitride ceramic based wave-transparent composite material. According to the method, the preparation temperature of the composite material is effectively lowered, and an appropriate preparation temperature can be selected for each of different fiber reinforcements, thereby reducing the damage to the fiber. The prepared boron nitride ceramic matrix is compact and uniform, is beneficial to carry and protect the fiber, and has the advantages of high ceramic level and purity and excellent wave-transparent property.

Description

technical field [0001] The invention relates to a preparation method of a wave-transparent fiber-toughened boron nitride ceramic-based wave-transparent composite material, in particular to a method for preparing a wave-transparent fiber-toughened boron nitride ceramic-based wave-transparent composite material by chemical vapor infiltration. Background technique [0002] Nitride ceramics is an ideal candidate material for a new generation of high-performance missile radome. However, the inherent defects of nitride ceramics (such as: dense silicon nitride ceramics have high dielectric constant and difficult sintering; boron nitride ceramics are difficult to sinter and mechanical properties Poor, poor rain erosion resistance, etc.), which limits its practical application in the field of missile radome. In this regard, at present, the methods of preparing nitride ceramic matrix composites or nitride composite ceramics are mostly used at home and abroad to solve the above problem...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/583C04B35/622
Inventor 殷小玮刘也刘永胜成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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