Preparation method of transparent magnesia-alumina spinel ceramic

A technology of magnesia-alumina spinel and magnesia-alumina spinel powder, which is applied in the field of preparation of transparent ceramic materials, can solve the problems of lower transmittance and mechanical properties, high requirements for raw material powder, and high cost, so as to reduce production costs , good mechanical properties and optical properties, and the effect of saving equipment investment

A technology of magnesia-alumina spinel and magnesia-alumina spinel powder, which is applied in the field of preparation of transparent ceramic materials, can solve the problems of lower transmittance and mechanical properties, high requirements for raw material powder, and high cost, so as to reduce production costs , good mechanical properties and optical properties, and the effect of saving equipment investment

CN108640672AInactive Publication Date: 2018-10-12WUHAN UNIV OF TECH
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  • Preparation method of transparent magnesia-alumina spinel ceramic
  • Preparation method of transparent magnesia-alumina spinel ceramic
  • Preparation method of transparent magnesia-alumina spinel ceramic

Examples

Experimental program
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Embodiment 1

[0038] A Magnesium Aluminum Spinel Transparent Ceramic MgO·Al 2 o 3 , the preparation method is as follows:

[0039] Weigh 150g of magnesium oxide (average particle size 100nm) and α-alumina (average particle size 180nm) according to the mass percentages of 28.33% and 71.67% respectively, and add alumina balls and absolute ethanol according to the ball-to-material mass ratio of 4:1 Mix and ball mill for 24 hours, then remove the solvent by rotary evaporation, pass through a 100-mesh sieve, then sinter at 1350°C for 10 minutes in solid state reaction, and finally pass through a 200-mesh sieve to obtain MgO·Al 2 o 3 Spinel powder, the average particle size of the powder is 180nm;

[0040] The MgO·Al prepared above 2 o 3 Put the spinel powder into the graphite mold, and then put the mold into the insulation felt of the spark plasma sintering equipment to pre-press 7.5MPa. At room temperature, use a heating rate of 100℃ / min to heat the mold to 1425℃, and wait until the temper...

Embodiment 2

[0048] A Magnesium Aluminum Spinel Transparent Ceramic MgO·1.44Al 2 o 3 , the preparation method is as follows:

[0049] Weigh magnesia (average particle size 100nm) and α-alumina (average particle size 180nm) 150g in total according to the mass fraction of 21.54% and 78.46%, respectively, add alumina balls and absolute ethanol according to the ball-to-material mass ratio of 4:1 Mix and ball mill for 24 hours, then remove the solvent by rotary evaporation, pass through a 100-mesh sieve, then sinter at 1350°C for 10 minutes in solid state reaction, and finally pass through a 200-mesh sieve to obtain MgO·1.44Al 2 o 3 Spinel powder, the average particle size of the powder is 225nm;

[0050] The above-prepared MgO·1.44Al 2 o 3 Put the spinel powder into the graphite mold, and then put the mold into the insulation felt of the spark plasma sintering equipment to pre-press 7.5MPa. At room temperature, use a heating rate of 100℃ / min to heat the mold to 1400℃. When the temperature...

Embodiment 3

[0058] A Magnesium Aluminum Spinel Transparent Ceramic MgO·1.8Al 2 o 3 , the preparation method is as follows:

[0059] Weigh magnesia (average particle size 200nm) and α-alumina (average particle size 400nm) 150g in total according to the mass fraction of 18.01% and 81.99%, respectively, add alumina balls and absolute ethanol according to the ball-to-material mass ratio of 4:1 Mix and ball mill for 24 hours, then remove the solvent by rotary evaporation, pass through a 100-mesh sieve, then sinter at 1680°C for 15 minutes in solid state reaction, and finally pass through a 200-mesh sieve to obtain MgO·1.8Al 2 o 3 Spinel powder, the average particle size of the powder is 600nm;

[0060] The above-prepared MgO·1.8Al 2 o 3 Put the spinel powder into the graphite mold, and then put the mold into the insulation felt of the spark plasma sintering equipment to pre-press 7.5MPa. At room temperature, use a heating rate of 10℃ / min to heat the mold to 1300℃. When the temperature rea...

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Abstract

The invention provides a preparation method of transparent magnesia-alumina spinel ceramic MgO.nAl2O3, wherein n is larger than or equal to 1 and smaller than or equal to 2. The method specifically comprises the steps as follows: 1) MgO powder and alpha-Al2O3 are mixed and ball-milled, a solvent is removed, sieving is performed, and magnesia-alumina spinel powder is obtained after a high-temperature solid-phase reaction and sieving; 2) the magnesia-alumina spinel powder is placed in a graphite mold, the graphite mold is placed in spark plasma sintering equipment for forming and pre-sintering,and a pre-sintered body is obtained; 3) the pre-sintered body is placed in a muffle furnace to be sintered again, natural cooling is performed, and a pore-closed sintered body is obtained; 4) the pore-closed sintered body is subjected to hot isostatic pressing sintering treatment, a sintered sample is polished, and the transparent magnesia-alumina spinel ceramic is obtained. By means of the method, the sample composition can be controlled, high compactness can be obtained without addition of a sintering aid, large-scale industrial production can be performed through sintering in non-pressure air, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the field of preparation of transparent ceramic materials, in particular to a magnesium aluminum spinel MgO·nAl 2 o 3 (1≤n≤2) Preparation method of transparent ceramics. Background technique [0002] Magnesium-aluminum spinel transparent ceramic material has high temperature resistance, chemical corrosion resistance, excellent electrical insulation and mechanical properties, and has good optical transmittance in the wavelength range of 0.20-6.5 μm. As a solid solution, the properties of magnesium aluminum spinel change with the stoichiometry, which provides a technical basis for regulating the properties of materials by controlling the composition. The solid solution of alumina into the spinel lattice reduces the lattice constant and improves its mechanical properties, which makes spinel transparent ceramics meet the performance requirements of different application fields. For example, it is used as a transparent armor and ...

Claims

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Application Information

Patent Timeline
12 Oct 2018
Publication
CN108640672A
IPC
C04B35/443; C04B35/622
CPC
C04B35/443; C04B35/622; C04B2235/9653
Inventors
王皓; 郭胜强