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BN-Si2N2O composite ceramic and preparation method thereof

A technology of composite ceramics and hexagonal boron nitride, which is applied in the field of boron nitride-based ceramic materials and its preparation, can solve the problems of low efficiency, difficulty in preparation, and high preparation cost, and achieve excellent dielectric properties, low thermal expansion coefficient, and high temperature. Effect of Strength and Thermal Shock Resistance

Active Publication Date: 2013-06-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high preparation cost, low efficiency and difficulty in preparing large-sized boron nitride-based ceramic components in the existing preparation methods of boron nitride-based composite materials, and to provide a BN-Si 2 N 2 O composite ceramics and preparation method thereof

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  • BN-Si2N2O composite ceramic and preparation method thereof
  • BN-Si2N2O composite ceramic and preparation method thereof

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specific Embodiment approach 1

[0015] Specific implementation mode 1: This implementation mode is a kind of BN-Si 2 N 2 O composite ceramics are made of 15% to 40% of amorphous nano-silicon dioxide, 5% to 30% of silicon nitride powder and 30% to 80% of hexagonal boron nitride powder by volume percentage; and wherein the nitrogen The volume ratio of silicon oxide powder to amorphous nano-silicon oxide is less than 1.

[0016] The sum of the volume fractions of amorphous nano-silicon dioxide, silicon nitride powder and hexagonal boron nitride powder described in this embodiment is 100%.

[0017] The BN-Si described in this embodiment 2 N 2 O composite ceramics contain Si 2 N 2 O, Si 2 N 2 O in BN-Si 2 N 2 O composite ceramic plays the role of improving the high temperature strength and thermal shock resistance of the material, and improving the high temperature dielectric wave transmission performance; so the BN-Si described in this embodiment 2 N 2 O composite ceramics can meet the requirements of...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the amorphous nano-silica is amorphous nano-silica powder or silica sol; wherein the amorphous nano-silica The average particle size of silicon oxide powder is 0.9 μm to 3 μm; the amorphous SiO in the silica sol 2 The particle mass fraction is 30%, and the amorphous SiO in the silica sol 2 The average particle diameter of the particles is 9nm-13nm. Others are the same as the first embodiment.

specific Embodiment approach 3

[0019] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the average particle size of the silicon nitride powder is 1 μm to 1.5 μm; the average particle size of the hexagonal boron nitride powder is 0.9 μm~1.5μm. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a BN-Si2N2O composite ceramic and a preparation method thereof, relates to a boron nitride based ceramic material and a preparation method thereof, and aims to solve the problems that an existing method for preparing the boron nitride based composite material is high in preparation cost, low in efficiency and difficult in preparation of large-size boron nitride based ceramic components. The BN-Si2N2O composite ceramic is prepared from amorphous nano silicon dioxide, silicon nitride powder and hexagonal boron nitride powder. The preparation method comprises the following steps of: one, weighing; two, preparing slurry through ball milling; three, drying to prepare powder; four, prepressing and forming; five, performing isostatic cool pressing treatment; and six, performing sintering treatment to obtain the BN-Si2N2O composite ceramic. The preparation method has the advantages that the preparation cost is reduced, the efficiency is improved, and the difficulty for preparing the large-size boron nitride based ceramic components is reduced. The preparation method is mainly used for preparing the BN-Si2N2O composite ceramic.

Description

technical field [0001] The invention relates to a boron nitride-based ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, the flight speed and maneuverability of space vehicles have been greatly improved, which puts forward more stringent requirements for the selection of antenna window or radome materials. High Mach number aircraft require wave-transparent materials to have high heat resistance, good thermal shock resistance and stable dielectric properties, but the performance of existing ceramic wave-transparent materials obviously cannot meet the requirements; Although the boron nitride-based composite material meets the requirements of high Mach number aircraft, the existing method of preparing boron nitride-based composite materials by hot pressing has high preparation costs and low efficiency, and the preparation of boron nitride-based composite materials by hot pressing In the process...

Claims

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Application Information

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IPC IPC(8): C01B31/00C01B32/00
Inventor 贾德昌田卓段小明杨治华叶书群周玉张培峰
Owner HARBIN INST OF TECH
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