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Method for preparing magnesium silicate porous ceramic

A technology of porous ceramics and magnesium silicate, which is applied in the field of porous ceramics, can solve the problems that micron-sized pores cannot be made, holes cannot be connected continuously, and gaps are not evenly distributed, so that it is easy to implement, the method is simple, low cost effect

Inactive Publication Date: 2009-12-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these preparation processes, there are some problems such as the inability to make micron-sized pores, the uneven distribution of voids, the inability to connect pores continuously, and the complex process.

Method used

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  • Method for preparing magnesium silicate porous ceramic
  • Method for preparing magnesium silicate porous ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh the MgO powder and put it in a muffle furnace for calcination at 500°C for 3 hours to remove CO 2 and moisture; then SiO 2 Dry in a drying oven at 100°C for 24 hours to avoid the stoichiometric ratio shift due to moisture absorption. Use a precision electronic balance to measure the processed raw materials by MgO / SiO 2 Proportion R = 2.05 after accurate weighing of ingredients. Put the prepared powder into an alumina crucible and pre-fire it in a muffle furnace at 1200°C in an air atmosphere for 3 hours to fully react the raw material powder. The calcined powder is processed by ball milling, drying and sieving, so that the particle size of the powder reaches 100 μm, and the obtained magnesium silicate powder is mixed with the premixed liquid to prepare a ceramic slurry with a solid content greater than 50%. Magnesium acid powder 5wt% cornstarch and dispersant after ball milling to promote uniform dispersion of the slurry, then add the initiator and catalyst to ...

Embodiment 2

[0029] Weigh the MgO powder, put it in a muffle furnace and calcinate at 700°C for 4 hours to remove CO 2 and moisture; then SiO 2 Dry in a drying oven at 150°C for 12 hours to avoid the stoichiometric ratio shift due to moisture absorption. Use a precision electronic balance to measure the processed raw materials by MgO / SiO 2Proportion R = 2.05 after accurate weighing of ingredients. Put the prepared powder into the alumina crucible and place it in a muffle furnace at 1050°C in an air atmosphere for 5 hours to pre-fire to fully react the raw material powder. The calcined powder is processed by ball milling, drying and sieving, so that the particle size of the powder reaches 150 μm, and the obtained magnesium silicate powder is mixed with the premixed liquid to prepare a ceramic slurry with a solid content greater than 50%. Magnesium acid powder 10wt% cornstarch and dispersant after ball milling to promote uniform dispersion of the slurry, and then the initiator and catalys...

Embodiment 3

[0034] Weigh the MgO powder, put it in a muffle furnace and calcinate at 800°C for 2 hours to remove CO 2 and moisture; then SiO 2 Dry in a drying oven at 80°C for 24 hours to avoid the shift of stoichiometric ratio due to moisture absorption. Use a precision electronic balance to measure the processed raw materials by MgO / SiO 2 Proportion R = 2.05 after accurate weighing of ingredients. Put the prepared powder into an alumina crucible and place it in a muffle furnace at 1100°C in an air atmosphere for 4 hours to pre-fire to fully react the raw material powder. The calcined powder is processed by ball milling, drying and sieving, so that the particle size of the powder reaches 250 μm, and the obtained magnesium silicate powder is mixed with the premix to prepare a ceramic slurry with a solid content greater than 50%. Magnesium acid powder 20wt% cornstarch and dispersant after ball milling to promote uniform dispersion of the slurry, and then the initiator and catalyst are a...

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Abstract

The invention discloses a method for preparing a magnesium silicate porous ceramic, relates to a porous ceramic, and provides a method for preparing the magnesium silicate porous ceramic with high porosity and strength, low thermal conductivity, easy method and low cost. The method comprises the following steps: calcining a MgO raw material to remove CO2 and water content, and drying SiO2; mixing magnesium oxide with the silicon dioxide, and performing ball milling on the mixture to obtain mixed powder of the magnesium oxide and the silicon dioxide; drying, screening, presintering, ball-milling, re-drying and re-screening the mixed powder of the magnesium oxide and the silicon dioxide to obtain magnesium silicate powder; mixing the magnesium silicate powder with premixed solution to prepare ceramic slurry, adding corn starch and a dispersant to the ceramic slurry and then performing ball milling on the mixture, adding a catalyst and an initiator to the mixture, and injecting the mixture into a mould after mixing to obtain a formed green body; and sintering the formed green body after demoulding to obtain the magnesium silicate porous ceramic.

Description

technical field [0001] The invention relates to a porous ceramic, in particular to a preparation method of a magnesium silicate porous ceramic. Background technique [0002] Since the interpenetrating micropores or pores are evenly distributed inside the porous ceramics, its main performance is that it has high porosity and permeability, low bulk density, large specific surface area, pore shape, pore size and distribution of pores in three-dimensional space. It can be adjusted, has high mechanical strength, chemical stability, heat insulation performance, thermal stability, good corrosion resistance, and long service life. It is a new type of green functional material. Therefore, using the uniform permeability of porous ceramics, various filters, separation devices, fluid distribution components and mixing components can be manufactured; using its developed specific surface area, various porous electrodes, catalyst carriers and heat exchangers can be made. ;Using the energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/20C04B38/00
Inventor 熊兆贤周明勇郑建森薛昊潘捷肖芬
Owner XIAMEN UNIV
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