Method for preparing MgO.Al2O3 superfine powder by sol-gel process

A technology of ultra-fine powder and sol, which is applied in the direction of magnesium oxide, aluminum oxide/aluminum hydroxide, etc., and can solve the problem of high cost

Inactive Publication Date: 2015-04-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses expensive hybrid double metal alkoxides as raw materials, so the cost is relatively high

Method used

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  • Method for preparing MgO.Al2O3 superfine powder by sol-gel process
  • Method for preparing MgO.Al2O3 superfine powder by sol-gel process
  • Method for preparing MgO.Al2O3 superfine powder by sol-gel process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take commercially available purity of 99.0% magnesium 120g, aluminum 270g, add to 3500g of n-butanol with a purity of 99.0%, add iodine as a catalyst, the heating temperature is 118 ± 1 ° C, in the process of preparation according to the solution Color and whether it boils to determine whether the reaction is complete. After the reaction is completed, magnesium-aluminum bimetallic alkoxide can be prepared, and then the alkoxide solution is heated under normal pressure to reclaim excessive n-butanol, reducing costs, and then using vacuum distillation at 800 Purify the above-mentioned magnesium-aluminum bimetallic alkoxide solution under the conditions of ~1200Pa and 280-400°C, add ethanol to the purified magnesium-aluminum bimetallic alkoxide to prepare an alkoxide solution with a concentration of 0.3mol / L, drop Add deionized water, add the chelating agent acetylacetone as 1: 10 according to the ratio of the amount of the chelating agent and the alkoxide, stir to make the...

Embodiment 2

[0027]Weigh 120g of commercially available magnesium with a purity of 99.0%, 270g of aluminum, add 3500g of n-butanol with a purity of 99.0%, add iodine as a catalyst, and heat at a temperature of 118±1°C. Color and whether it boils to determine whether the reaction is complete. After the reaction is completed, magnesium-aluminum bimetallic alkoxide can be prepared, and then the alkoxide solution is heated under normal pressure to reclaim excessive n-butanol, reducing costs, and then using vacuum distillation at 800 Purify the above-mentioned magnesium-aluminum bimetallic alkoxide solution under the conditions of ~1200Pa and 280-400°C, add ethanol to the purified magnesium-aluminum bimetallic alkoxide to prepare an alkoxide solution with a concentration of 0.2mol / L, drop Add deionized water, add the chelating agent acetylacetone as 1: 10 according to the ratio of the amount of the chelating agent and the alkoxide, stir to make the alkoxide solution fully hydrolyzed, and after t...

Embodiment 3

[0029] Weigh 120g of commercially available magnesium with a purity of 99.0%, 270g of aluminum, add 3500g of n-butanol with a purity of 99.0%, add iodine as a catalyst, and heat at a temperature of 118±1°C. Color and whether it boils to determine whether the reaction is complete. After the reaction is completed, magnesium-aluminum bimetallic alkoxide can be prepared, and then the alkoxide solution is heated under normal pressure to reclaim excessive n-butanol, reducing costs, and then using vacuum distillation at 800 Purify the above-mentioned magnesium-aluminum bimetallic alkoxide solution under the conditions of ~1200Pa and 280-400°C, add ethanol to the purified magnesium-aluminum bimetallic alkoxide to prepare an alkoxide solution with a concentration of 0.4mol / L, drop Add deionized water, add the chelating agent acetylacetone as 1: 10 according to the ratio of the amount of the chelating agent and the alkoxide, stir to make the alkoxide solution fully hydrolyzed, and after ...

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Abstract

The invention relates to a method for preparing MgO.Al2O3 superfine powder by a sol-gel process and belongs to the field of preparation of superfine powder. The method comprises the following steps: adding magnesium and aluminum in a ratio of amount of substance being 1: 2 into an organic alcohol solvent; by using iodine as a catalyst, preparing a precursor compound magnesium and aluminum double metal alkoxide under a heating condition; heating the alkoxide solution at the normal pressure so as to recover excessive organic alcohol; then, purifying by virtue of distillation at a reduced pressure; adding ethanol to prepare a 0.2-0.4mol / L alkoxide solution; dropwise adding deionized water, adding a chelating agent and stir to fully hydrolyze the alkoxide solution; gelling and drying; and roasting in a heating furnace to obtain MgO.Al2O3 superfine powder. The MgO.Al2O3 superfine powder prepared by the invention is simple in process and low in cost. The grain size range of the superfine powder prepared is within 200-600nm, and the superfine powder sprayed to molten steel can refine grains so as to improve the mechanical property of a steel product.

Description

technical field [0001] The invention belongs to the field of ultrafine powder preparation, in particular to a sol-gel process for preparing MgO·Al 2 o 3 The method of ultrafine powder. Background technique [0002] In order to save resources and fully tap the performance potential of traditional materials, in recent years, ultra-fine grain steel is mainly based on the realization of ultra-fine grains of materials through deformation and heat treatment of materials, so as to improve the strength and toughness of materials. In the metallurgical process, the method of grain refinement is mainly through the modification of nucleating agents, and by providing a large number of dispersed particles to promote heterogeneous nucleation, so that more fine grains can be obtained after the molten steel solidifies, and sprayed into the steel MgO·Al 2 o 3 Ultrafine powder improves the strength of steel through fine grain strengthening and precipitation strengthening. When the oxides a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F5/02
CPCC01F7/02C01F5/02C01P2002/72C01P2004/03C01P2004/62
Inventor 李阳姜周华韩纪鹏方勇杨永超汪秀秀徐光李吉虎潘海军
Owner NORTHEASTERN UNIV
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