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Porous mullite-corundum ceramics preparation method

A technology of porous mullite and mullite, which is applied to ceramic products, applications, household appliances, etc., can solve the problems of reducing the mechanical strength of ceramic products, easy cracking of ceramic frames, and difficult control of air bubbles, so as to overcome difficult control and thermal expansion. The effect of small coefficient and easy factory construction

Inactive Publication Date: 2016-12-21
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical method to prepare porous ceramic products reacts quickly, and the generated bubbles are not easy to control; the organic foam impregnation method has a simple process and is usually used to prepare porous ceramics with high porosity and through-pore structure. The heating rate must be very slow, and when the organic template is burned out, it is easy to produce slag, causing environmental pollution, and the ceramic frame is easy to crack, which will significantly reduce the mechanical strength of the final ceramic product; while the foaming method has the advantages of producing tiny bubbles and high porosity. , controllable hole shape and size, low production cost and simple process, etc.

Method used

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  • Porous mullite-corundum ceramics preparation method
  • Porous mullite-corundum ceramics preparation method
  • Porous mullite-corundum ceramics preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0018] A preparation method of porous mullite-corundum ceramics, comprising the following steps:

[0019] Weigh 320 grams of bauxite (2.825 moles of Al 2 o 3 ) and 80 g of diatomaceous earth (1.132 mol SiO 2 ) into the mill for continuous wet grinding for 12 hours, filter the slurry to obtain a filter cake, dry the filter cake in an oven at 110°C and grind to obtain a mixed powder, put the mixed powder in a container and add water (the amount of water and powder The weight ratio is 1.2:1) Stir for 30min, then add 20g starch, 2.0g triammonium citrate, 0.4g sodium carboxymethylcellulose and 0.6g silicone polyether emulsion (solid content 55wt%), stir well before adding 4g of sodium lauryl sulfate, stirred for 6 minutes to obtain a uniform and stable foam slurry and then injection molded, then placed the formed foam slurry in an oven at 40°C for 60 minutes, and demoulded to obtain a solidified foam body. Insulate in an oven at 110°C for 24 hours, cool naturally and place in an...

Embodiment 2

[0021] A preparation method of porous mullite-corundum ceramics, comprising the following steps:

[0022] Weigh 332 grams of bauxite (2.930 moles of Al 2 o 3 ) and 69 g of diatomaceous earth (0.976 mol SiO 2 ) into the mill for continuous wet grinding for 6 hours, filter the slurry to obtain a filter cake, dry the filter cake in an oven at 110°C and grind to obtain a mixed powder, put the mixed powder in a container and add water (the amount of water and powder The weight ratio is 1.2:1) and stir for 10min, then add 20g starch, 2.0g triammonium citrate, 0.2g sodium carboxymethylcellulose and 0.8g silicone polyether emulsion (solid content 55wt%), stir well and add 4.0 g sodium lauryl sulfate, stirred for 4 minutes to obtain a uniform and stable foam slurry, then injection molded, then placed the formed foam slurry in an oven at 70 ° C for 10 minutes, demolded to obtain a solidified foam body Put it in an oven at 140°C for 6 hours, and after natural cooling, place it in an e...

Embodiment 3

[0024] A preparation method of porous mullite-corundum ceramics, comprising the following steps:

[0025] Weigh 259 grams of bauxite (2.286 moles of Al 2 o 3 ) and 40.5 g of diatomaceous earth (0.573 mol of SiO 2 ) into the mill for continuous wet grinding for 11 hours, filter the slurry to obtain a filter cake, dry the filter cake in an oven at 110°C and grind to obtain a mixed powder, put the mixed powder in a container and add water (water and powder The weight ratio is 1.3:1) and stir for 30min, then add 15g starch, 1.5g triammonium citrate, 0.6g sodium carboxymethylcellulose and 0.2g silicone resin polyether emulsion (solid content 55wt%), stir well and then add 2.5 g sodium lauryl sulfate, stirred for 5 minutes to obtain a uniform and stable foam slurry, then injection molded, then placed the formed foam slurry in an oven at 40 ° C for 50 minutes, demolded to obtain a solidified foam body Put it in an oven at 110°C for 20 hours, cool it naturally and place it in an el...

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Abstract

The invention relates to a porous mullite-corundum ceramics preparation method. The method takes bauxitic clay and diatomite as raw materials, then employs steps of wet grinding, filtering, drying and stirring, and additionally adds a binder, a dispersant, a foam stabilizer and a foaming agent, and finally the product is molded, dried and sintered to obtain the porous mullite-corundum ceramics. The method has the characteristics of simple process, short production period, high efficiency, stable product quality, and low cost. The porous mullite-corundum ceramics material can be prepared according to the requirement, and has good industrial utilization prospect.

Description

technical field [0001] The invention relates to a method for preparing porous mullite-corundum ceramics, in particular to a method for preparing porous mullite-corundum ceramics by using bauxite and diatomite as raw materials. Background technique [0002] Porous ceramics is an inorganic non-metallic material with many pores. It has excellent characteristics such as high porosity, high permeability, corrosion resistance, large specific surface area, low bulk density and low thermal conductivity. It is widely used in metallurgy, chemical industry Environmental protection, energy, food, pharmaceuticals, biology and other fields, used as materials for filtration, separation, air distribution, sound absorption, heat insulation, chemical fillers, bioceramics and catalyst carriers, etc. attention of researchers in the field. [0003] Currently, there are three main methods for preparing porous ceramics, including chemical methods, organic foam impregnation methods, and foam metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B38/06C04B35/185C04B35/10C04B35/622C04B35/64C04B35/636C04B35/634
CPCC04B38/10C04B35/10C04B35/185C04B35/622C04B35/63488C04B35/6365C04B35/64C04B38/0645C04B2235/449C04B38/007
Inventor 杨中正杨雨晴李杰韩江峰马凯
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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