Flaky alpha-Al2O3 powder and preparation method thereof

A powder and flake technology is applied in the field of flake α-Al2O3 powder and its preparation, which can solve the problems of uneven distribution of components, difficulty in preparing alumina powder, etc. Controllable effect

Inactive Publication Date: 2016-07-06
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the sol-gel method, due to the different solubility of various salts, the components in the calcined precursor powder are unevenly distributed, which makes it difficult to prepare relatively uniform alumina powder.

Method used

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  • Flaky alpha-Al2O3 powder and preparation method thereof
  • Flaky alpha-Al2O3 powder and preparation method thereof
  • Flaky alpha-Al2O3 powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A flake α-Al 2 o 3 The preparation method of powder, it comprises the following steps:

[0029] (1) Prepare raw materials: weigh 42g aluminum sulfate octadecahydrate, 8.60g sodium sulfate, 10.53g potassium sulfate, 0.032g titanyl sulfate, 0.15g sodium phosphate and 42.00g potassium hydroxide;

[0030] (2) Mix each raw material with absolute ethanol (the amount of absolute ethanol added is 1.5 times the total mass of the raw material) by ball milling, and after drying, perform calcination at 1100°C for a holding time of 5 hours, then cool naturally to room temperature, and calcine The product is flaky α-Al 2 o 3 Powder and molten salt mixture;

[0031] (3) Wash the calcined product obtained in step (2) with deionized water to remove water-soluble salts in the product, then filter and dry to obtain flaky α-Al 2 o 3 Powder.

[0032] Such as figure 1 As shown, the flaky α-Al prepared in this example 2 o 3 The average particle size of the powder is 18μm and the dis...

Embodiment 2

[0034] A flake α-Al 2 o 3 The preparation method of powder, it comprises the following steps:

[0035] (1) Prepare raw materials: weigh 42g aluminum sulfate octadecahydrate, 8.60g sodium sulfate, 10.53g potassium sulfate, 0.032g titanyl sulfate and 0.15g sodium phosphate;

[0036] (2) Mix each raw material with absolute ethanol (the amount of absolute ethanol added is 1.5 times the total mass of the raw material) by ball milling, and after drying, perform calcination at 1100°C for a holding time of 5 hours, then cool naturally to room temperature, and calcine The product is flaky α-Al 2 o 3 Powder and molten salt mixture;

[0037] (3) Wash the calcined product obtained in step (2) with deionized water to remove water-soluble salts in the product, then filter and dry to obtain flaky α-Al 2 o 3 Powder.

[0038] The flaky α-Al prepared in this example 2 o 3 The average particle size of the powder is 15.9 μm, and the thickness is 0.10 μm-0.40 μm.

Embodiment 3

[0040] A flake α-Al 2 o 3 The preparation method of powder, it comprises the following steps:

[0041] (1) Prepare raw materials: weigh 42g aluminum sulfate octadecahydrate, 8.60g sodium sulfate, 10.53g potassium sulfate, 0.032g titanyl sulfate, 0.15g sodium phosphate and 2.50g sodium carbonate;

[0042] (2) Mix each raw material with absolute ethanol (the amount of absolute ethanol added is 1.5 times the total mass of the raw material) by ball milling, and after drying, perform calcination at 1100°C for a holding time of 5 hours, then cool naturally to room temperature, and calcine The product is flaky α-Al 2 o 3 Powder and molten salt mixture;

[0043] (3) Wash the calcined product obtained in step (2) with deionized water to remove water-soluble salts in the product, then filter and dry to obtain flaky α-Al 2 o 3 Powder.

[0044] The flaky α-Al prepared in this example 2 o 3 The average particle size of the powder is 11.4 μm, and the thickness is 0.15 μm-0.35 μm.

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Abstract

The invention discloses a preparation method of flaky alpha-Al2O3 powder. The preparation method comprises the following steps: (1) preparing raw materials including an aluminum salt, a titanium salt, a sodium salt, a potassium salt, a phosphate and an alkaline raw material; (2) performing ball milling on the raw materials, uniformly mixing the raw materials after ball milling, performing calcination after drying, and then cooling the calcined product to a room temperature; and (3) purifying the calcined product obtained in the step (2) to obtain the flaky alpha-Al2O3 powder. The flaky alumina prepared by the method disclosed by the invention is controllable in particle size, is uniformly dispersed and is smooth, and the preparation method is very simple and can be applied to industrial production easily.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a flaky α-Al 2 o 3 Powder and its preparation method. Background technique [0002] Alumina is a common ceramic material, which has the characteristics of high melting point, high temperature resistance, high strength, oxidation resistance, corrosion resistance, good thermal conductivity and high resistivity, and the corresponding mineral reserves are abundant and cheap. Flake α-alumina has a special two-dimensional sheet structure, its particle size is micron level, and its thickness can reach nanometer level, which has dual functions of nanometer and micron powder. Flaky alumina not only has the excellent properties of ordinary alumina, but also has certain surface activity, is easy to disperse, has good adhesion, light reflection ability and excellent shielding effect. The excellent properties of flaky alumina make it widely used in life, especially for pearlescent pigments, cosmet...

Claims

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Application Information

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IPC IPC(8): C01F7/32C04B35/111C04B35/64
CPCC01F7/32C01P2002/72C01P2004/03C01P2004/22C01P2004/61C01P2004/62C01P2004/64C04B35/1115C04B35/64
Inventor 常钢苏界何云斌夏甜甜贾红梅
Owner HUBEI UNIV
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