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High purity nano-scale magnesium-aluminum spinel synthesis method

A magnesia-aluminum spinel and a synthesis method technology are applied in the synthesis field of high-purity nano-magnesium-aluminum spinel to achieve the effects of huge specific surface area, huge surface activity and lower sintering temperature

Inactive Publication Date: 2013-02-20
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has paid attention to the purity of the synthetic raw materials of magnesium aluminum spinel, using relatively pure (≥98%) raw materials, and using γ-Al with high sintering activity 2 o 3 Replace α-Al used in general sintering 2 o 3 , but there are still major shortcomings

Method used

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  • High purity nano-scale magnesium-aluminum spinel synthesis method
  • High purity nano-scale magnesium-aluminum spinel synthesis method
  • High purity nano-scale magnesium-aluminum spinel synthesis method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The synthetic method of the high-purity nano-scale magnesium-aluminum spinel provided in this embodiment comprises the following steps:

[0020] 1) Lightly calcined magnesium hydroxide nanocrystals at 400°C for 20 minutes to obtain lightly calcined magnesium oxide;

[0021] 2) Dilute the light-burned magnesia and boehmite by MgO and Al 2 o 3 The amount of substance is 1:1 and the ingredients are mixed evenly;

[0022] 3) Put the prepared materials in the fast ball mill, the speed is 1000r / min, and the fast ball mill is 180min;

[0023] 4) Put the ball-milled mixture into the mold and pressurize it, dry press it into a disc of Ф10mm×5mm, the pressure is 20MPa, the pressure holding time is 1min, and the green body sample is obtained after unloading;

[0024] 5) Pre-fire the green body sample at 500°C for 1 hour, heat it up to 850°C for 3 hours, and then cool it to room temperature to obtain high-purity nano-scale magnesium-aluminum spinel.

[0025] The product of this...

Embodiment 2

[0027] The synthetic method of the high-purity nano-scale magnesium-aluminum spinel provided in this embodiment comprises the following steps:

[0028] 1) Lightly calcined magnesium hydroxide nanocrystals at 400°C for 20 minutes to obtain lightly calcined magnesium oxide;

[0029] 2) Dilute the light-burned magnesia and boehmite by MgO and Al 2 o 3 The amount of substance is 1:1 and the ingredients are mixed evenly;

[0030] 3) Put the prepared materials in the fast ball mill, the speed is 1000r / min, and the fast ball mill is 180min;

[0031] 4) Put the ball-milled mixture into the mold and pressurize it, dry press it into a disc of Ф10mm×5mm, the pressure is 20MPa, the pressure holding time is 1min, and the green body sample is obtained after unloading;

[0032] 5) Pre-fire the green body sample at 500°C for 1 hour, heat it up to 1100°C for 3 hours, and then cool it to room temperature to obtain high-purity nano-scale magnesium-aluminum spinel.

[0033] The product of thi...

Embodiment 3

[0035] The synthetic method of the high-purity nano-scale magnesium-aluminum spinel provided in this embodiment comprises the following steps:

[0036] 1) Lightly calcined magnesium hydroxide nanocrystals at 400°C for 20 minutes to obtain lightly calcined magnesium oxide;

[0037] 2) Dilute the light-burned magnesia and boehmite by MgO and Al 2 o 3 The amount of substance is 1:1 and the ingredients are mixed evenly;

[0038] 3) Put the prepared materials in the fast ball mill, the speed is 1000r / min, and the fast ball mill is 180min;

[0039] 4) Put the ball-milled mixture into the mold and pressurize it, dry press it into a disc of Ф10mm×5mm, the pressure is 20MPa, the pressure holding time is 1min, and the green body sample is obtained after unloading;

[0040] 5) Pre-fire the green body sample at 500°C for 1 hour, heat it up to 1500°C for 2 hours, and then cool it to room temperature to obtain high-purity nano-scale magnesium-aluminum spinel.

[0041] The product of thi...

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Abstract

The present invention discloses a high purity nano-scale magnesium-aluminum spinel synthesis method, which comprises the following steps: 1) uniformly mixing light burning magnesium oxide and boehmite according to an amount ratio of MgO to Al2O3 of 1:1, and carrying out ball milling and drying molding to obtain a billet sample sheet; and 2) pre-burning the billet sample sheet for 1 h at a temperature of 500 DEG C, then heating to a temperature of 850-1500 DEG C, carrying out thermal insulation for 2-3 h, and cooling to a room temperature to obtain the high purity nano-scale magnesium-aluminum spinel. According to the present invention, the raw material combination is the light burning magnesium oxide and the boehmite, a sintering reaction activity of the newborn gamma-Al2O3 obtained after boehmite pre-burning is greater than a sintering reaction activity of the general gamma-Al2O3, and the nano-scale material has a huge specific surface area and surface activity so as to reduce a sintering temperature of the magnesium-aluminum spinel, shorten a thermal insulation time, and reduce energy consumption, wherein the sintered spinel content can be up to 97.9%; and the method is applicable for industrial production, and meets requirements of energy saving and emission reduction.

Description

technical field [0001] The invention relates to a method for synthesizing high-purity nano-scale magnesium-aluminum spinel, which belongs to the field of nanometer materials. Background technique [0002] Magnesium-aluminum spinel is widely used in the refractory industry because of its high melting point, high hardness, thermal shock resistance and slag erosion resistance; at the same time, because of its high melting point, high thermal conductivity, low thermal expansion coefficient, High strength, high hardness, good ultraviolet, visible, infrared transmittance and good insulation, magnesium aluminum spinel is also an ideal far-infrared fairing material and halogen lamp tube material to replace alumina. Magnesium-aluminum spinel can also be used as bulletproof observation window material. Under the same protection capability, it can be 60% thinner than the currently used composite material bulletproof observation window. The brightness of the projection tube of the cat...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 许荣辉刘纳康现辉许粲靳静然赵优岭李春涛李潇鲁道欢李厅汪钰珂李邦勇
Owner HENAN UNIV OF SCI & TECH
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