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Aluminum nitride/aluminum oxide composite ceramic and preparation method thereof

A technology of alumina ceramics and multiphase ceramics, which is used in ceramic molding machines, manufacturing tools, additive processing, etc. problems, to achieve the effects of excellent thermal conductivity and dense performance, good dispersion uniformity, and reduced preparation costs

Inactive Publication Date: 2019-11-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides an aluminum nitride / alumina composite ceramic and a preparation method thereof, which are used to solve the problem of re-doping aluminum nitride / alumina composite ceramics with alumina powder and aluminum nitride powder. It is difficult to achieve uniform dispersion of aluminum nitride powder in the alumina ceramic matrix, which is not conducive to improving the thermal conductivity of aluminum nitride / alumina composite ceramics

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  • Aluminum nitride/aluminum oxide composite ceramic and preparation method thereof

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Embodiment 1

[0047] This embodiment provides the first preparation method of aluminum nitride / alumina composite ceramics, the specific steps are as follows:

[0048] 1. Weigh 71 parts by weight of alumina ceramic powder, 1.42 parts by weight of yttrium oxide, 20.58 parts by weight of hexanediol diacrylate, 7 parts by weight of FQ-9 phenolic resin and 1.06 parts by weight of BYK 9076 dispersant, and ball mill for 10 hours Finally, 0.02 part of Darocur 1173 photoinitiator was added, and ball milling was continued for 5 minutes to obtain an alumina ceramic slurry with a solid content of 40 vol%.

[0049] 2. Use a light-curing 3D printer to carry out light-curing 3D printing and molding, control the laser wavelength to 250nm, and the exposure to 100mJ / cm 2 , the single-layer curing time is 1s, and the printing layer thickness is 50μm; 3D printing is carried out according to the preset three-dimensional structure model, and a special-shaped alumina ceramic green body is obtained.

[0050] 3. P...

Embodiment 2

[0054] This embodiment provides the second preparation method of aluminum nitride / alumina composite ceramics, the specific steps are as follows:

[0055] 1. Weigh 75 parts by weight of alumina ceramic powder, 3.75 parts by weight of yttrium fluoride, 14.75 parts by weight of polyurethane acrylate, 5 parts by weight of n-butyl acrylate, 1.5 parts by weight of 2130 phenolic resin and 1.5 parts by weight of SOLSPERSE 8000 dispersant, After 24 hours of ball milling, 0.59 parts of Irgacure 184 photoinitiator was added, and ball milling was continued for 10 minutes to obtain an alumina ceramic slurry with a solid content of 47 vol%.

[0056] 2. Use a light-curing 3D printer for light-curing 3D printing, control the laser wavelength to 460nm, and the exposure to 4mJ / cm 2 , the single-layer curing time is 15s, and the printing layer thickness is 10μm; 3D printing is carried out according to the preset three-dimensional structure model, and a special-shaped alumina ceramic green body i...

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Abstract

The invention belongs to the technical field of ceramic material preparation, and particularly relates to an aluminum nitride / aluminum oxide composite ceramic and a preparation method thereof. The preparation method for the aluminum nitride / aluminum oxide composite ceramic disclosed in the invention comprises the following steps: doping a carbon source into an aluminum oxide ceramic mixture, and then carrying out molding and vacuum carbonization treatment to obtain an aluminum oxide ceramic blank; carrying out carbothermal reduction nitridation treatment on the aluminum oxide ceramic blank; introducing aluminum nitride ceramic into the aluminum oxide ceramic blank in situ; and successively carrying out decarburization and sintering treatment so as to obtain the aluminum nitride / aluminum oxide composite ceramic. According to the invention, an aluminum nitride secondary phase is uniformly distributed in an aluminum oxide matrix, so the heat conductivity of the aluminum nitride / aluminum oxide composite ceramic is improved, and the prepared aluminum nitride / aluminum oxide composite ceramic has excellent heat-conducting properties and compactness; and the aluminum nitride ceramic is introduced in situ through the carbothermal reduction nitridation treatment, so the preparation cost of the aluminum nitride / aluminum oxide composite ceramic can be reduced.

Description

technical field [0001] The invention belongs to the technical field of ceramic material preparation, and in particular relates to an aluminum nitride / alumina composite ceramic and a preparation method thereof. Background technique [0002] Alumina (Al 2 o 3 ) Ceramics have excellent insulation properties, chemical stability, thermal conductivity and high-frequency characteristics, and are rich in raw materials and low in cost, making them the most widely used ceramic substrate materials in the electronic information manufacturing industry, accounting for the total ceramic substrate market. More than 90% of. But since Al 2 o 3 The thermal conductivity of ceramics is relatively low (25 ~ 30W m -1 ·K -1 ), which makes its application field limited, and it is difficult to apply to high-power LED, insulated gate bipolar transistor chip (IGBT) and other fields. Aluminum nitride (AlN) ceramics have excellent thermal conductivity (theoretical thermal conductivity is 319W m -...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/64B28B1/00B33Y10/00
CPCC04B35/10C04B35/622C04B35/64B28B1/001B33Y10/00C04B2235/3865C04B2235/3225C04B2235/46C04B2235/445C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/96C04B2235/9607
Inventor 伍尚华黎业华聂光临盛鹏飞
Owner GUANGDONG UNIV OF TECH
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