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

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

Example Embodiment

[0016] Example 1

[0017] First, the Al 2 (SO 4 ) 3 Place Al 2 O 3 In the crucible, cover the crucible lid, and then calcinate at 900°C for 3 hours to partially decompose it into Al 2 O 3 . Secondly, the partially decomposed Al 2 (SO 4 ) 3 With the right amount of Na 2 SO 4 Through ball milling, the raw material ratio of the mixed powder is such that Al 2 (SO 4 ) 3 Al generated after complete decomposition 2 O 3 With Na 2 SO 4 The volume ratio of molten salt medium is 1:6. The above mixed powder is dried at 80℃ and placed in open Al 2 O 3 Calcined in a crucible at 1100°C for 1 hour. The reaction product is washed with water for many times to remove Na 2 SO 4 , figure 1 Is the obtained hexagonal plate Al 2 O 3 Scanning electron micrograph of the particles. Al 2 O 3 The particles are almost monodisperse hexagonal plate-like particles with uniform size (1±0.1μm).

Example Embodiment

[0018] Example 2

[0019] First, the Al 2 (SO 4 ) 3 Place Al 2 O 3 In the crucible, cover the crucible lid, and then calcinate at 900°C for 3 hours to partially decompose it into Al 2 O 3 . Secondly, the partially decomposed Al 2 (SO 4 ) 3 With the right amount of Na 2 SO 4 Through ball milling, the raw material ratio of the mixed powder is such that Al 2 (SO 4 ) 3 Al generated after complete decomposition 2 O 3 With Na 2 SO 4 The volume ratio of molten salt medium is 1:8. The above mixed powder is dried at 80℃ and placed in open Al 2 O 3 Calcined in a crucible at 1200°C for 2 hours. The reaction product is washed with water for many times to remove Na 2 SO 4 , figure 2 Is the obtained hexagonal plate Al 2 O 3 Scanning electron micrograph of the particles. Al 2 O 3 The particles are also almost monodisperse hexagonal plate-like particles, with an average particle size of 960±120nm.

Example Embodiment

[0020] Example 3

[0021] The process of Example 3 is almost the same as that of Example 2, except that 5-40wt% of hexagonal plate-shaped Al with a particle size of 1μm is added during the ball milling and mixing 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 micrograph 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 the addition of plate-shaped Al 2 O 3 In the case of seed crystals, Al in the powder 2 O 3 The particles use plate-like seeds as templates and grow according to the Oswald growth mechanism; this leads to plate-like Al in the final powder 2 O 3 The particle size and the size and content of the seed crystal should have the following relationship...

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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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