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A kind of flaky α-al with controllable particle size 2 o 3 Powder and preparation method thereof

A flake and particle size technology, used in the field of fillers and ceramic composite materials, can solve the problems of not preparing the particle size, seldom considering the effect of size, and not studying the amount of seed crystals added, and achieve the effect of particle size control.

Inactive Publication Date: 2018-02-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Little consideration has been given to the addition of alumina seed crystals to the flake α-Al 2 o 3 The effect of size, in theory, has not been studied on the amount of seed added and the size of the seed crystals with flake α-Al 2 o 3 There is a mathematical relationship between the particle size of the powder. In terms of technology, no flake α-Al with controllable particle size and high dispersion is not produced. 2 o 3 Powder

Method used

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  • A kind of flaky α-al with controllable particle size <sub>2</sub> o <sub>3</sub> Powder and preparation method thereof
  • A kind of flaky α-al with controllable particle size <sub>2</sub> o <sub>3</sub> Powder and preparation method thereof
  • A kind of flaky α-al with controllable particle size <sub>2</sub> o <sub>3</sub> Powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the first step, dissolve 112.0g Al in 300ml deionized water 2 (SO4) 3 18H 2 O, 28g γ-Al 2 o 3 , 57.6gNa 2 SO 4 and 47.2gK 2 SO 4 (The molar ratio of soluble salts to aluminum sulfate is 4:1), then add 2.7g flake α-Al 2 o 3 Seed crystal (equivalent to 6% of the final alumina quality, purchased from Hebei Oak Fine Chemical Co., Ltd.), flake α-Al 2 o 3 The average particle size of the seed crystals is 2.80±0.22um, and the mixture is stirred for 15 minutes to obtain a uniform solution M.

[0037] In the second step, 54 g of sodium carbonate was dissolved in 150 ml of deionized water to obtain N solution. Afterwards, under the action of stirring, the solution N was slowly dropped into the M solution, and the pH of the solution was controlled to be 9 to obtain a mixed aluminum hydroxide gel.

[0038] In the third step, put the aluminum hydroxide gel in an oven and dry it at 100°C for 24 hours. After drying, it is placed in an alumina crucible, calcined in a mu...

Embodiment 2

[0041] In this example, flake α-Al 2 o 3 The amount of seed crystals added was 20% of the mass of the final alumina, and other conditions and methods were the same as in Example 1.

[0042] from SEM figure 2 As can be seen in the flaky α-Al 2 o 3 It is in the shape of hexagonal scales without twin crystal nuclei. The flaky α-Al was obtained by analyzing the software Nano Measurer 1.2 2 o 3 The average particle size is 4.69±0.35um. When stirred and dispersed in water, flake α-Al 2 o 3 The powder produces smooth streamlines with strong metallic luster, showing its good dispersibility in water. Discovery of flaky α-Al 2 o 3 The final particle size of the powder and the flake α-Al 2 o 3 The size of the seed crystal is proportional to the size of the flaky α-Al 2 o 3 The cubic root of the seed content is inversely proportional to the relationship; by changing the flake α-Al 2 o 3 The size and content of the seed crystals can well realize the flaky α-Al 2 o 3 Pow...

Embodiment 3

[0044] In this example, flake α-Al 2 o 3 The amount of seed crystals added was 40% of the mass of the final alumina, and other conditions and methods were the same as in Example 1.

[0045] from SEM image 3 As can be seen in the flaky α-Al 2 o 3 For the hexagonal scales, no twin nuclei reunion. The flaky α-Al was obtained by analyzing the software Nano Measurer 1.2 2 o 3 The average particle size is 3.76±0.22um. When stirred and dispersed in water, flake α-Al 2 o 3 The powder produces smooth streamlines with strong metallic luster, showing its good dispersibility in water. Discovery of flaky α-Al 2 o 3 The final particle size of the powder and the flake α-Al 2 o 3 The size of the seed crystal is proportional to the size of the flaky α-Al 2 o 3 The cubic root of the seed content is inversely proportional to the relationship; by changing the flake α-Al 2 o 3 The size and content of the seed crystals can well realize the flaky α-Al 2 o 3 Powder particle size c...

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Abstract

The invention discloses a sheet alpha-Al2O3 powder body with a controllable particle diameter size and a preparation method of the sheet alpha-Al2O3 powder body. The preparation method comprises the following steps of: (1) preparing a mixed precursor solution which is obtained by uniformly mixing water-soluble aluminum salt, soluble salt, nanometer aluminum oxide crystal seeds and / or sheet alpha-Al2O3 crystal seeds, wherein the water-soluble aluminum salt contains unstable aluminum oxide; (2) adding an alkaline aqueous solution to the mixed precursor solution obtained in the step (1), and when a hydrolysis reaction is ended, and controlling the final pH to be 5.0-9.0 so as to obtain mixed gel containing hydrolysis products; (3) drying the mixed gel, and then calcining the dried mixed gel so as to obtain a mixture of the sheet alpha-Al2O3 powder body and fused salt; and (4) cleaning the fused salt with ionized water, sucking and filtering the cleaned fused salt, and drying the filtered fused salt so as to obtain the pure sheet alpha-Al2O3 powder body. The particle diameter size of the prepared sheet aluminum oxide powder body is controllable. The sheet aluminum oxide is uniform to disperse and is smooth and level, and twin crystals do not appear.

Description

technical field [0001] The invention relates to flaky α-Al with controllable particle size 2 o 3 Powder and preparation method thereof, due to flake α-Al 2 o 3 It has the advantages of large hardness and modulus, high strength, good chemical stability, high temperature resistance, etc., the flake α-Al 2 o 3 The powder is mainly used in the field of pigments, and also in the fields of ceramic composite materials and fillers. Background technique [0002] Alumina has a wide range of industrial uses and has always been one of the hot spots of scientific research. Flake α-Al 2 o 3 It is a kind of various forms of alumina, the added value of the product is very high, and the potential for development is huge. Flake α-Al 2 o 3 As a base material for pearlescent pigments, it has the following main advantages: [0003] (1) Flake α-Al 2 o 3 The synthesis of mica is relatively simple, due to the flake α-Al 2 o 3 Compared with mica pearlescent pigments, it can produce str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B82Y30/00B82Y40/00
Inventor 张集发程小苏
Owner SOUTH CHINA UNIV OF TECH
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