Plate-like aluminum oxide granule preparation method

A plate-shaped alumina and plate-shaped technology, which is applied in the preparation of plate-shaped alumina particles, the preparation of plate-shaped Al2O3 particles and its size control, can solve the problems of coarse particle size, serious agglomeration, unevenness, etc., and achieve The effect of fine and uniform particles and simple preparation process

Inactive Publication Date: 2006-07-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the existing reports, the obtained plate-shaped Al 2 o 3 The size of the particles is generally relatively coarse (5 ~ 33μm), not only uneven, but also agglomeration is often serious
This is not conducive to the subsequent application of the material
In addition, there is currently no feasible method for the obtained plate-shaped Al 2 o 3 Precise control of particle size

Method used

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  • Plate-like aluminum oxide granule preparation method
  • Plate-like aluminum oxide granule preparation method
  • Plate-like aluminum oxide granule preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, the Al 2 (SO 4 ) 3 placed in Al 2 o 3 In the crucible, cover the crucible lid, and then calcined at 900°C for 3 hours to partially decompose it into Al 2 o 3 . Second, the partially decomposed Al 2 (SO 4 ) 3 with an appropriate amount of Na 2 SO 4 Mixed by ball milling, the raw material ratio of the mixed powder is such that Al 2 (SO 4 ) 3 Al produced after complete decomposition 2 o 3 with Na 2 SO 4 The volume ratio of the molten salt medium is 1:6. The above mixed powder was dried at 80°C and placed in the open Al 2 o 3 Calcined at 1100°C for 1 hour in a crucible. The reaction product was washed with water several times to remove Na 2 SO 4 , figure 1 For the obtained hexagonal plate Al 2 o 3 Scanning electron micrographs of the particles. al 2 o 3 The particles are almost monodisperse hexagonal tabular particles with uniform size (1±0.1 μm).

Embodiment 2

[0019] First, the Al 2 (SO 4 ) 3 placed in Al 2 o 3 In the crucible, cover the crucible lid, and then calcined at 900°C for 3 hours to partially decompose it into Al 2 o 3 . Second, the partially decomposed Al 2 (SO 4 ) 3 with an appropriate amount of Na 2 SO 4 Mixed by ball milling, the raw material ratio of the mixed powder is such that Al 2 (SO 4 ) 3 Al produced after complete decomposition 2 o 3 with Na 2 SO 4 The volume ratio of the molten salt medium is 1:8. The above mixed powder was dried at 80°C and placed in the open Al 2 o 3 Calcined at 1200°C for 2 hours in a crucible. The reaction product was washed with water several times to remove Na 2 SO 4 , figure 2 For the obtained hexagonal plate Al 2 o 3 Scanning electron micrographs of the particles. al 2 o 3 The particles are also almost monodisperse hexagonal tabular particles with an average particle size of 960±120 nm.

Embodiment 3

[0021] The process of embodiment 3 is almost identical to that of embodiment 2, except that 5-40 wt% of hexagonal plate-like Al with a particle size of 1 μm is added during the ball milling process of the raw material powder 2 o 3 The particles act as seeds. image 3 (A), (B) and (C) are the plate-like Al obtained when the seed crystal addition amount is 5, 20.7 and 37wt%, respectively 2 o 3 Scanning electron micrographs of the particles. Al in each sample 2 o 3 The particles are approximately hexagonal plate-shaped particles, and their average particle size varies with the content of seed crystals. Further research found that, after adding plate-like Al 2 o 3 In the case of seed crystals, Al in the powder 2 o 3 The particles use the plate-shaped seed as a template and grow according to the Oswald growth mechanism; thus resulting in the plate-shaped Al in the final powder 2 o 3 The particle size should have the following relationship with the size and content of the...

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Abstract

The invention discloses a plate-shaped Al2O3 particle making method and dimension control method in the fine chemical domain, which comprises the following steps: taking partial decomposed aluminum salt as Al2O3 pioneer body; making the Al2O3 particle through fused salt method; controlling the particle dimension precisely through adding plate-shaped Al2O3 seed in the raw material powder; making the dimension of Al2O3 particle between sub-micron and several micron.

Description

technical field [0001] The present invention relates to a kind of tabular alumina (Al 2 o 3 ) particle preparation method, more precisely related to a plate-shaped Al 2 o 3 The preparation of particles and the method for size control thereof belong to the field of fine chemical industry. Background technique [0002] Tabular Al 2 o 3 Granules are an important industrial raw material. Tabular Al in composite ceramics 2 o 3 As a toughening agent, it can greatly improve the crack deflection and bridging effect in the porcelain body, and improve the toughness of the material. Using plate Al 2 o 3 High thermal conductivity, the introduction of plate-like Al in plastic electronic packaging materials 2 o 3 It can greatly improve the thermal conductivity of plastics and improve the heat dissipation effect of electronic devices. In addition, plate-like Al 2 o 3 Granular or Textured Al by Template-Induced Grain Growth 2 o 3 Indispensable template particles for ceramic...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01F7/32
Inventor 高濂靳喜海
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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