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Preparation method of aluminum oxide/mullite composite super-hydrophobic powder

A technology of mullite and alumina, which is applied in the field of preparation of alumina/mullite composite superhydrophobic powder, can solve the problems of superhydrophobic surface strength, poor wear resistance and corrosion resistance, application limitations, etc. Good thermal shock resistance, high production efficiency, and good dispersion

Inactive Publication Date: 2015-02-18
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as template method, electrospinning method, etc.; finally, from the perspective of practical application, the existing superhydrophobic surface has poor strength, wear resistance and corrosion resistance
During use, the hydrophobic effect of the superhydrophobic surface will gradually decrease with the prolongation of use time due to the accumulation of dust and organic pollutants in the air, external force damage, chemical corrosion, etc., which makes its application subject to many restrictions.

Method used

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  • Preparation method of aluminum oxide/mullite composite super-hydrophobic powder
  • Preparation method of aluminum oxide/mullite composite super-hydrophobic powder
  • Preparation method of aluminum oxide/mullite composite super-hydrophobic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029](1) First add 300gAl 2 o 3 Add 180ml concentrated sulfuric acid in the powder, Al 2 o 3 The particle size of the powder is 2 o 3 Powder;

[0030] (2) will pretreat Al 2 o 3 Powder and silica gel powder, B 2 o 3 and Na 2 SO 4 Molten salt is mixed, in which, Al 2 o 3 The mass ratio of powder to silica gel powder is 10:1, B 2 o 3 The molar ratio with silica gel powder is 1:6, silica gel powder and Na 2 SO 4 The molar ratio of molten salt is 1:4;

[0031] (3) After drying the mixture obtained in step (2), put it in a ceramic crucible for calcination at 1000°C, keep it warm for 3 hours after reaching the calcination temperature, then take out the crucible, wash the obtained product with distilled water, and dry it Alumina / mullite composite powder with micro-nano structure is obtained.

Embodiment 2

[0033] (1) First add 200gAl 2 o 3 Add 180ml concentrated sulfuric acid in the powder, Al 2 o 3 The particle size of the powder is 2 o 3 Powder;

[0034] (2) will pretreat Al 2 o 3 Powder and silica gel powder, B 2 o 3 and Li 2 SO 4 Molten salt is mixed, in which, Al 2 o 3 The mass ratio of powder to silica gel powder is 8:1, B 2 o 3 The molar ratio with silica gel powder is 1:5, silica gel powder and Li 2 SO 4 The molar ratio of molten salt is 1:3;

[0035] (3) After drying the mixture obtained in step (2), place it in a ceramic crucible for calcination at 700°C, keep it warm for 5 hours after reaching the calcination temperature, then take out the crucible, wash the obtained product with distilled water, and dry it Alumina / mullite composite powder with micro-nano structure is obtained.

Embodiment 3

[0037] (1) First add 400gAl 2 o 3 Add 180ml concentrated sulfuric acid in the powder, Al 2 o 3 The particle size of the powder is 2 o 3 Powder;

[0038] (2) will pretreat Al 2 o 3 Powder and silica gel powder, B 2 o 3 and KCl-K 2 SO 4 Composite molten salt is mixed, among them, KCl and K 2 SO 4 The molar ratio is 0.74:0.26, Al 2 o 3 The mass ratio of powder to silica gel powder is 12:1, B 2 o 3 The molar ratio with silica gel powder is 1:7, pretreatment Al 2 o 3 powder, silica gel powder and B 2 o 3 The total mass of KCl-K 2 SO 4 The mass ratio of composite molten salt is 1:6;

[0039] (3) After drying the mixture obtained in step (2), place it in a ceramic crucible for calcination at 900°C, keep it warm for 1 hour after reaching the calcination temperature, then take out the crucible, wash the obtained product with distilled water, and dry it Alumina / mullite composite powder with micro-nano structure is obtained.

[0040] The aluminum oxide / mullite comp...

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Abstract

The invention discloses a preparation method of aluminum oxide / mullite composite super-hydrophobic powder. The method comprises the following concrete steps: (1) adding concentrated sulfuric acid into Al2O3 powder, mechanically or ultrasonically stirring at 25-70 DEG C for 30-120 minutes, and performing washing, suction filtration and drying to obtain preprocessed Al2O3 powder; (2) mixing the preprocessed Al2O3 powder with silicon-containing raw materials, B2O3 and fused salt; (3) drying a mixture obtained from the step (2), calcining in a ceramic crucible at 700-1000 DEG C, preserving heat for 1-5 hours after the calcining temperature is reached, taking out from the crucible, washing an obtained product by distilled water, and drying to obtain the aluminum oxide / mullite composite powder. According to the method, expensive equipment is not required, the aluminum oxide / mullite composite powder with a micro-nanostructure can be directly prepared through a very simple process, and the composite powder is good in dispersity and nearly free from agglomerates.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a preparation method of alumina / mullite composite superhydrophobic powder. Background technique [0002] Since German biologist Barthlott et al. studied the superhydrophobic properties of lotus leaves in 1977, scholars from various countries have carried out a large number of theoretical and methodological studies on superhydrophobic phenomena. A superhydrophobic surface generally refers to a surface with a contact angle with water greater than 150° and a rolling angle less than 10°. Its many properties, such as self-cleaning, superhydrophobic and low friction coefficient, make it have great application prospects in the fields of construction, medicine, electronics, environmental protection, liquid transportation and so on. According to the calculation of the Oak Ridge National Laboratory in the United States, only in the three aspects of motors and pumps, water tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/626
Inventor 邓义群沈针
Owner JIANGXI UNIV OF SCI & TECH
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