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Preparation method of zirconia sol-reinforced magnesium aluminate spinel porous ceramic

A technology of magnesia-aluminum spinel and porous ceramics, which can be applied to ceramic products, other household utensils, and household utensils. It can solve the problems of poor compressive strength, etc., and achieve the goals of increasing service life, low raw material cost, and improving impact strength. Effect

Inactive Publication Date: 2019-12-06
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the heat-insulating porous ceramic material prepared by the foaming method has a higher porosity and a better heat-insulating effect, but there are a large number of small cracks on the pore wall, resulting in poor compressive strength of the sample.

Method used

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  • Preparation method of zirconia sol-reinforced magnesium aluminate spinel porous ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of a zirconia sol-reinforced magnesia-aluminum spinel porous ceramic given in this example has the following raw material composition: a particle size of 250 mesh active light-burned magnesia powder 5kg (16.642% by mass), a particle size 15kg of activated alumina powder for 250 mesh (49.927% by mass), 10kg of zirconia sol with a concentration of 0.25mol / L (33.285% by mass), 70kg of water, through mixing, foaming, molding, drying and sintering To prepare porous ceramics with zirconia sol-reinforced magnesium aluminum spinel, the specific operation steps are as follows:

[0027] First, put the activated light burnt magnesia powder, activated alumina powder and zirconia sol in a ball mill tank and add water, and mix in the ball mill for 3 hours to fully mix the materials to obtain a mixed slurry; weigh 4g SDS ( 0.012% by mass), 20g dextrin (0.067% by mass) and 20g CMC (0.067% by mass) are placed in a beaker, 50g of water is added, and the mixer is quick...

Embodiment 2

[0031] The preparation method of a zirconia sol-reinforced magnesia-aluminum spinel porous ceramic given in this example has the following raw material composition: a particle size of 250 mesh active light-burned magnesia powder 10kg (19.981% by mass), a particle size 25kg of activated alumina powder for 250 mesh (49.953% by mass), 15kg of zirconia sol with a concentration of 0.25mol / L (29.972% by mass), and 50kg of water. Through mixing, foaming, molding, drying and burning To prepare porous ceramics with zirconia sol-reinforced magnesium aluminum spinel, the specific operation steps are as follows:

[0032] First, put the activated light burnt magnesia powder, activated alumina powder and zirconia sol in a ball mill tank and add water, and mix in a ball mill for 5 hours to fully mix the materials to obtain a mixed slurry; weigh 7g SDS ( 0.014% by mass), 20g dextrin (0.040% by mass) and 20g CMC (0.040% by mass) are placed in a beaker, 50g of water is added, and the mixer is quic...

Embodiment 3

[0036] The preparation method of a zirconia sol-reinforced magnesia-aluminum spinel porous ceramic given in this example has the following raw material composition: a particle size of 300 mesh active light-burned magnesia powder 10kg (19.982% by mass), a particle size 20kg of activated alumina powder for 300 mesh (39.964% by mass), 20kg of zirconia sol with a concentration of 0.5mol / L (39.964% by mass), and 50kg of water. Through mixing, foaming, molding, drying and burning To prepare porous ceramics with zirconia sol-reinforced magnesium aluminum spinel, the specific operation steps are as follows:

[0037] First, put the activated light burned magnesia powder, activated alumina powder and zirconia sol in a ball mill tank and add water, and mix in the ball mill for 4 hours to fully mix the materials to obtain a mixed slurry; weigh 6g SDS ( 0.010% by mass percentage), 20g dextrin (0.040% by mass percentage) and 20g CMC (0.040% by mass percentage) are placed in a beaker, 50g water...

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Abstract

The invention relates to a preparation method of a zirconia sol-reinforced magnesium aluminate spinel porous ceramic. The zirconia sol-reinforced magnesium aluminate spinel porous ceramic is obtainedby taking activated light calcined magnesia powder and activated alumina powder as powder materials, zirconia sol as a a reinforcing agent and water as a solvent, adding sodium dodecyl benzene sulfonate (SDS) as a foaming agent, dextrin as a foam stabilizer and carboxymethyl cellulose (CMC) as a thickening agent, and carrying out mixing, foaming, molding, drying and sintering. The zirconia sol-reinforced magnesium aluminate spinel porous ceramic is prepared with a foaming method which is simple in process; the zirconia sol is introduced into a magnesium aluminate spinel porous ceramic; and thestrength of the porous ceramic is enhanced by forming nano-zirconia particles on the hole walls, so that the magnesium aluminate spinel porous ceramic with the high strength and the high porosity isobtained.

Description

Technical field [0001] The invention relates to the technical field of inorganic chemical engineering, in particular to a preparation method of zirconia sol reinforced magnesium aluminum spinel porous ceramics. Background technique [0002] Magnesium-aluminum spinel has high thermal stability, high mechanical strength and hardness, and has the advantages of good corrosion resistance and low thermal expansion coefficient. It has the unique surface properties of both alkaline and acidic active centers. Therefore, the magnesium-aluminum spinel porous ceramics show broad application prospects in the fields of hot gas filtration, molten metal filtration, catalyst carrier and thermal insulation. However, as the porosity increases, the strength of porous ceramics decreases, which limits the wide application of porous ceramics. [0003] The current methods for preparing porous ceramics include: pre-embedded filling burnout method, foaming method, sol-gel method, gel injection molding and ...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/443C04B35/622
CPCC04B38/00C04B35/443C04B35/622C04B2235/3244
Inventor 罗旭东杨孟孟李季佳
Owner UNIV OF SCI & TECH LIAONING
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