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A kind of si-al-o-n-b composite ceramic material and preparation method thereof

A technology of composite ceramics and raw materials, applied in the field of functional ceramics, can solve the problems of high dielectric constant, difficult forming of complex components, limited purity, etc., and achieve the effects of not easy to crack, rheological properties, and lower dielectric constant

Inactive Publication Date: 2015-09-09
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a Si-Al-O-N-B complex with good comprehensive performance and applicable to the field of aerospace wave transmission to overcome the defects of existing materials such as limited purity, high dielectric constant, and difficult forming of complex components. Phase ceramic material, and provide a kind of preparation method of Si-Al-O-N-B composite phase ceramic material that is easy to shape

Method used

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  • A kind of si-al-o-n-b composite ceramic material and preparation method thereof
  • A kind of si-al-o-n-b composite ceramic material and preparation method thereof

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Embodiment 1

[0030] The Si-Al-O-N-B composite ceramic material of this embodiment is pressed into a green body from the following raw materials and mixed powder in parts by weight: 100g of silicon nitride, 50g of aluminum nitride, and 55g of aluminum oxide; Oxyzine is impregnated into the green body, then cross-linked and solidified, pyrolyzed at high temperature, and sintered; its dielectric constant is 4.73.

[0031] preparation:

[0032] (1) Forming of the biscuit: Mix 100g of silicon nitride (particle size 0.5μm), 50g of aluminum nitride (particle size of 0.8μm), and 55g of alumina (particle size of 1.0μm) in a uniform ratio, ball mill for 24 hours, and then use The mixed powder is pressed into shape by a mechanical compression molding method, and the molding pressure is 150 MPa.

[0033] (2) Immerse borazine, the liquid precursor of BN, into the green body by vacuum impregnation (initial pressure: 100Pa). Make the precursor fully penetrate into the biscuit.

[0034] (3) Place the g...

Embodiment 2

[0037] In this embodiment, the Si-Al-O-N-B composite ceramic material is pressed into a green body from the following raw materials and mixed powder in parts by weight: 60 g of silicon nitride, 80 g of aluminum nitride, 20 g of aluminum oxide, and 40 g of silicon oxide; The liquid precursor borazine is impregnated into the green body, then cross-linked and solidified, cracked at high temperature and sintered; its dielectric constant is 3.55.

[0038] preparation:

[0039] (1) Forming of the biscuit: Mix 60g of silicon nitride (particle size 100nm), 80g of aluminum nitride (particle size of 200nm), 20g of alumina (particle size of 80nm), 40g of silicon oxide (particle size of 200nm), and ball mill After 12 hours, the mixed powder was prepared by gel injection molding.

[0040] (2) Immerse borazine, the liquid precursor of BN, into the biscuit by means of pressure impregnation. The body is fully infiltrated into the biscuit; the pressure is 5MPa, and the medium is nitrogen.

...

Embodiment 3

[0044]In this embodiment, the Si-Al-O-N-B composite ceramic material is pressed into a green body from the following raw materials and mixed powder in parts by weight: 50 g of silicon nitride, 40 g of aluminum nitride, 50 g of aluminum oxide, and 60 g of silicon oxide; The liquid precursor borazine is impregnated into the green body, then cross-linked and solidified, pyrolyzed at high temperature, and sintered; its dielectric constant is 4.41.

[0045] preparation:

[0046] (1) Forming of the biscuit: Mix 50g of silicon nitride (particle size 10μm), 40g of aluminum nitride (particle size of 5μm), 50g of alumina (particle size of 3 μm), and 60g of silicon oxide (particle size of 2μm), After ball milling for 30 hours, the mixed powder was prepared by cold isostatic pressing at a pressure of about 240 MPa.

[0047] (2) Immerse borazine, the liquid precursor of BN, into the green body by means of pressure impregnation. 2MPa, stand still for 5h, so that the borazine precursor ful...

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Abstract

The invention discloses a Si-Al-O-N-B multiphase ceramic material and a preparation method thereof. The preparation method of the Si-Al-O-N-B multiphase ceramic material comprises the steps of pressing mixed powder comprising 25-55 parts by weight of silicon nitride, 10-40 parts by weight of aluminum nitride and 5-40 parts by weight of aluminum oxide into a biscuit, then soaking the biscuit in liquid precursor borazine of BN, and then performing crosslinking solidification, pyrolysis and sintering, wherein the dielectric constant is smaller than 6. The multiphase ceramic material disclosed by the invention is difficult to crack; the preparation process is simple, process parameters can be adjusted according to the properties of a target product, and meanwhile, the problem that the shaping of a complex component is difficult can be solved by using the good rheological property of the precursor.

Description

technical field [0001] The invention relates to the technical field of functional ceramics, in particular to a Si-Al-O-N-B composite ceramic material applicable to the field of aerospace wave transmission and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, aviation, aerospace, energy and many other high-tech fields have put forward more and more urgent demands for high-performance materials. Because ceramics have excellent high temperature resistance, ablation resistance, wear resistance, high hardness and other characteristics, and have high elastic modulus and low density, some ceramic matrix composites also have heat resistance, heat insulation, Therefore, all developed countries in the world regard ceramic materials as high-tech new materials that have an important impact on the future of mankind and focus on research. Sialon is a replacement solid solution based on the crystal structure of silicon nitrid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/582C04B35/10C04B35/622
Inventor 李斌刘坤张长瑞王思青曹英斌刘荣军
Owner NAT UNIV OF DEFENSE TECH
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