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A kind of preparation method of pseudo-boehmite and microcrystalline corundum abrasive

A pseudo-boehmite, microcrystalline corundum technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, other chemical processes, etc., can solve the problems of low purity, poor uniformity, large particle size, etc. High purity, high hardness and small particle size

Active Publication Date: 2011-12-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The preparation of microcrystalline corundum abrasives often uses pseudo-boehmite as a precursor, but due to the large particle size, poor uniformity, and low purity (sodium, calcium ions, etc.) of pseudo-boehmite products currently on the market, resulting in The microcrystalline corundum abrasive grain size is large, the impurity content is high, the sintering temperature is high and the sintering time is long, even if the sintering aid is added, the sintering temperature is as high as above 1300 °C
Therefore, microcrystalline corundum abrasives are generally prepared by high temperature, high pressure or special sintering process, the process is complicated, the equipment requirements are high and the energy consumption is large

Method used

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  • A kind of preparation method of pseudo-boehmite and microcrystalline corundum abrasive
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  • A kind of preparation method of pseudo-boehmite and microcrystalline corundum abrasive

Examples

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Embodiment 1

[0038] 1. Preparation of pseudo-boehmite

[0039] Add 51.5g of aluminum isopropoxide to a polytetrafluoroethylene reactor with a volume of 250mL, add 175.0mL of water and 6.25mL of hydrogen peroxide, stir evenly to obtain a white suspension, and heat the reactor at 90°C for 5 hours. The reaction kettle was naturally cooled to room temperature, and the obtained product was first washed twice with ethanol, then washed twice with water, and centrifuged to obtain pseudo-boehmite.

[0040] 2. Preparation of Microcrystalline Corundum Abrasives

[0041] 13g of pseudo-boehmite prepared by the above method was added to 250mL of water, 3mL of concentrated nitric acid (68wt%) was added, after stirring for 10h, 2.013g of Fe(NO 3 ) 3 9H 2 O and 0.843g Mg(NO 3 ) 2 ·6H 2 O, stirred for another 4h. The prepared suspension was dried at 90° C. under normal pressure for 12 hours to obtain a xerogel. Screen the xerogel with a particle size of 30-60 mesh for future use.

[0042] Put the s...

Embodiment 2

[0045] 1. Preparation of pseudo-boehmite: Add 51.5g of aluminum isopropoxide to a polytetrafluoroethylene reactor with a volume of 250mL, add 175.0mL of water and 3.75mL of hydrogen peroxide, stir well, and heat the reactor at 90°C for 5 hours . Wash the obtained product twice with ethanol and then twice with water to obtain pseudo-boehmite.

[0046] 2. Preparation of microcrystalline corundum abrasive: the method is the same as in Example 1. The hardness of the obtained microcrystalline corundum abrasive was 21.0 GPa.

Embodiment 3

[0048] As described in Example 1, the difference is that the amount of hydrogen peroxide added to prepare pseudo-boehmite is 8.75 mL. The microcrystalline corundum abrasive was prepared by the method in Example 1 of the obtained pseudo-boehmite case, and the hardness of the obtained microcrystalline corundum abrasive was 19.4 GPa.

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Abstract

The invention relates to a preparation method of pseudo-boehmite and a microcrystalline corundum abrasive. The method comprises the steps of: hydrolyzing aluminium isopropoxide under a hydrothermal condition so as to obtain the pseudo-boehmite with a particle diameter of 3-20nm, then preparing, drying, calcinating and sintering a pseudo-boehmite gel, thus obtaining the microcrystalline corundum abrasive. With controllable technical conditions, the method of the invention is suitable for large scale production, and the obtained microcrystalline abrasive has a particle size of 50-300nm, and a compact structure, with a density of 3.9-4.0g / cm<3> and hardness of 19-23GPa. Besides used as a wear resistant material, the obtained microcrystalline corundum abrasive can also be used in high temperature materials, matrials for electronic devices, high frequency insulating materials, aerospace materials, information materials and the like.

Description

technical field [0001] The invention relates to a preparation method of pseudo-boehmite and microcrystalline corundum abrasives, belonging to the field of inorganic non-metallic materials. Background technique [0002] Microcrystalline corundum abrasive has small grain size, high hardness, good toughness, high sintering density and low breakage rate, and has excellent performance. It is suitable for occasions requiring high grinding efficiency and high precision. It is used in machinery, electronics, aviation and military and other fields have been widely used. The preparation process of microcrystalline corundum abrasive mainly includes wet chemical method and solid phase method. The wet chemical method is to prepare a precursor with uniform chemical composition through the liquid phase, and then obtain ceramic materials with different microstructures through different heat treatment temperatures. See: J 2009, 29, 1337; J. Mater. Chem. 2009, 19, 1915; J. Am. Ceram. Soc. 20...

Claims

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Application Information

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IPC IPC(8): C01F7/02C09K3/14
Inventor 张立张建刘少杰陈代荣焦秀玲
Owner SHANDONG UNIV
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