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Preparation method of porous BN/Si3N4 composite ceramic hole sealing layer

A composite ceramic and hole sealing technology, which is applied in the field of surface sealing technology of porous BN/Si3N4 composite ceramics, can solve the problems of difficulty in meeting the requirements of high temperature use and great influence on dielectric properties, and achieves low cost, increased use temperature, Equipment simple effect

Active Publication Date: 2014-04-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention will solve existing porous BN / Si 3 N 4 The composite wave-transparent ceramic sealing layer material has a great influence on the dielectric properties of the overall material, and it is difficult to meet the requirements of high temperature use. A porous BN / Si 3 N 4 Preparation method of composite ceramic sealing layer

Method used

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  • Preparation method of porous BN/Si3N4 composite ceramic hole sealing layer
  • Preparation method of porous BN/Si3N4 composite ceramic hole sealing layer
  • Preparation method of porous BN/Si3N4 composite ceramic hole sealing layer

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specific Embodiment approach 1

[0031] Specific implementation mode 1: In this implementation mode, a porous BN / Si 3 N 4 The preparation method of the composite ceramic sealing layer is specifically carried out according to the following steps:

[0032] 1. Mix the ceramic powder and sintering aid evenly to obtain a mixed powder, wherein the ceramic powder is Si 3 N 4 Powder and SiO 2 Mixture of powders, Si 3 N 4 Powder and SiO 2 The molar ratio of the powder is 0.5-1.5, and the amount of sintering aid added is 5%-15% of the mass of the ceramic powder;

[0033] 2. Add the wetting agent and dispersant to deionized water to obtain a premixed solution, then adjust the pH value of the premixed solution to 8.5-10.5, then add the mixed powder obtained in step 1, and then ball mill and mix to obtain a sealing slurry. Control the solid phase volume content of the sealing slurry to 5-25%; among them, the amount of dispersant added is 0.2%-0.6% of the mass of ceramic powder, and the amount of wetting agent added...

specific Embodiment approach 2

[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the sintering aid in step one is Al 2 o 3 and Y 2 o 3 mixture of Al 2 o 3 The average particle size is 100nm, Y 2 o 3 The average particle size is 50nm, Al 2 o 3 with Y 2 o 3 The volume ratio is 1:2. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Specific embodiment three: the difference between this embodiment and specific embodiment one is: Si in step one 3 N 4 The average particle size of the powder is 0.5μm, SiO 2 The average particle size of the powder was 0.7 μm. Others are the same as in the first embodiment.

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Abstract

The invention discloses a preparation method of a porous BN / Si3N4 composite ceramic hole sealing layer. The invention relates to a surface hole sealing technology of porous BN / Si3N4 composite ceramic. The problems that the existing porous BN / Si3N4 composite wave-transmitting ceramic hole sealing layer material is large in effect on the dielectric property of the overall material and high temperature operating requirements are hard to meet are solved. The method comprises the following steps: 1, weighing the raw materials according to the ratio; 2, preparing hole sealing slurry; 3, preparing a hole sealing layer by adopting a vacuum impregnation method; 4, carrying out drying treatment and thermal treatment. The preparation method disclosed by the invention is simple in technology, and uniform and compact in thickness of the hole sealing layer; the hole sealing layer is formed by Si3N4 and Si2N2O composite ceramics; the control on phase composition of the hole sealing layer can be achieved by controlling the ratio of the Si3N4 to the SiO2; the porous BN / Si3N4 composite ceramic subjected to hole sealing treatment can be used as bearing, wave-transparent and thermal protection materials, and can be applied to the fields of aerospace and mechanical industry.

Description

technical field [0001] The present invention relates to porous BN / Si 3 N 4 Surface sealing process of composite ceramics. Background technique [0002] BN / Si 3 N 4 Composite ceramics can incorporate Si 3 N 4 Due to the high strength of ceramics and the low dielectric constant and machinability of BN ceramics, composite ceramics can exhibit excellent chemical stability, high thermal shock resistance, and low and stable temperature over a wide temperature range. Dielectric constant and dielectric loss. Therefore, BN / Si 3 N 4 Composite ceramics have become one of the most potential broadband wave-transmitting candidate materials in the world. In order to meet the broadband wave transmission characteristics of the material, it is often necessary to design the material into a porous structure, that is, to introduce some pores into the material to further reduce the dielectric constant and dielectric loss of the material. [0003] However, the specific surface area of ​​...

Claims

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Application Information

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IPC IPC(8): C04B35/5835C04B35/584C04B35/622
Inventor 王胜金贾德昌庄艳丽张培峰刘仁周玉
Owner HARBIN INST OF TECH
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