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A kind of highly dispersed thick flaky α-alumina micropowder and its preparation method

A micro-powder of alumina, high-dispersion technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., to achieve the effect of low price, simple preparation process, and smooth and smooth products

Active Publication Date: 2019-09-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the current α-Al 2 o 3 The research on micropowder mainly focuses on the morphology of thin flakes, spheres, needles, etc., and the thick flake α-Al with high dispersion and regular shape 2 o 3 The controllable preparation of micropowder has not been reported

Method used

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  • A kind of highly dispersed thick flaky α-alumina micropowder and its preparation method
  • A kind of highly dispersed thick flaky α-alumina micropowder and its preparation method
  • A kind of highly dispersed thick flaky α-alumina micropowder and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of highly dispersed thick flaky α-Al 2 o 3 The preparation method of micropowder specifically comprises the steps:

[0033] (1) Take 1.2g industrial AlOOH and 0.24g NH 4 BF 4 Grind in an agate mortar for 1 h to mix well, then transfer to a corundum crucible;

[0034] (2) Place the corundum crucible in a muffle furnace and calcinate according to the following heating program: raise the temperature to 300°C at a heating rate of 10°C / min, then raise the temperature to 1000°C at a heating rate of 5°C / min, and then increase the temperature at 2°C / min Raise the temperature to 1450°C at a heating rate of min, keep it at 1450°C for 3 hours, and cool naturally to room temperature to obtain α-Al 2 o 3 Micropowder, its appearance is like figure 1 as shown, figure 1 All diffraction peaks in 2 o 3 The characteristic peaks are consistent with each other, and there are no other impurity peaks, indicating that the obtained sample is pure phase α-Al 2 o 3 .

[0035] C...

Embodiment 2

[0037] A kind of highly dispersed thick flaky α-Al 2 o 3 The preparation method of micropowder specifically comprises the steps:

[0038] (1) Take 1.2g bommite and 0.235g NH respectively 4 BF 4 and 0.005g NH 4 F ground in an agate mortar for 1 h, then transferred to a corundum crucible;

[0039] (2) Place the corundum crucible in a muffle furnace and calcinate according to the following heating program: raise the temperature to 300°C at a heating rate of 10°C / min, then raise the temperature to 1000°C at a heating rate of 5°C / min, and then increase the temperature at 2°C / min Raise the temperature to 1450°C at a heating rate of min, keep it at 1450°C for 3 hours, and cool naturally to room temperature to obtain α-Al 2 o 3 Micropowder, its XRD test result is as follows figure 1 As shown, it was confirmed that the obtained sample was pure phase α-Al 2 o 3 .

[0040] Calcined α-Al in a crucible 2 o 3 The micropowder sample was transferred to an agate mortar and ground t...

Embodiment 3

[0042] A kind of highly dispersed thick flaky α-Al 2 o 3 The preparation method of micropowder specifically comprises the steps:

[0043] (1) Take 1.2g industrial AlOOH and 0.0012g NH 4 BF 4 Grind in an agate mortar for 3h to mix well, then transfer to a corundum crucible;

[0044] (2) Place the corundum crucible in a muffle furnace and calcinate according to the following heating program: heat up to 300°C at a heating rate of 5°C / min, then rise to 1000°C at a heating rate of 3°C / min, and then heat up to 1000°C at a heating rate of 2°C / min. Raise the temperature to 1100°C at a heating rate of min, keep it at 1100°C for 5 hours, and cool naturally to room temperature to obtain α-Al 2 o 3 Micronized.

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Abstract

The invention discloses a preparation method of highly dispersed thick sheet alpha-aluminum oxide micropowder. The preparation method comprises the following steps: uniformly mixing a precursor raw material with an additive; and calcining the mixture to obtain the highly dispersed thick sheet alpha-aluminum oxide micropowder, wherein the precursor raw material is industrial AlOOH; and the additiveis composed of NH4BF4 or is composed by compounding NH4BF4 and NH4F in a mass ratio of (20-200): 1. According to the method disclosed by the invention, the flow is simple, the operation is easy, thecost is low, impurities do not exist, and the method is suitable for industrial production on a large scale; the prepared thick sheet alpha-aluminum oxide product is controllable in particle size, uniform in size distribution and smooth and level, and can be applied to the fields which put special demands on alpha-aluminum oxide micropowder.

Description

technical field [0001] The invention belongs to the technical field of alumina micropowder preparation, in particular to a kind of highly dispersed thick flaky α-Al prepared from industrial AlOOH 2 o 3 micronized method. Background technique [0002] α-Al 2 o 3 Micropowder is an important inorganic non-metallic material, which is widely used because of its excellent properties such as high strength, high hardness, corrosion resistance, high temperature resistance and good wear resistance. For example, spherical activated alumina micropowder is widely used in petrochemical and biochemical fields due to its chemical stability and high specific surface area; flaky alumina is widely used in pigments, Cosmetics, automotive paints, refractory materials, toughened ceramics and other fields. Among them, the flaky alumina used in pigments and cosmetics requires a large diameter-to-thickness ratio (generally at least 10:1), so as to obtain good dispersion, gloss or spreading abil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/44
Inventor 朱玲玲孙春晖刘洛强陈留刚丁达飞李赛张阳叶国田
Owner ZHENGZHOU UNIV
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