Method for preparing porous mullite

A porous mullite, mass percentage technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of poor high temperature resistance, difficult synthesis process, control danger, etc., to improve strength, improve high temperature resistance, The effect of reducing the residual glass phase

Inactive Publication Date: 2010-06-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the material prepared by this method has poor high temperature resistance due to the large amount of glass phase. There are literature and patent reports that high-purity alumina, silicon dioxide and silicon fluoride gas react to form a high porosity , Porous mullite ceramics with good high temperature resistance and thermal shock resistance
This type of method is costly and the reaction is controlled by fluorine-containing gas, which makes the synthesis process difficult to control and has certain risks.

Method used

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  • Method for preparing porous mullite
  • Method for preparing porous mullite
  • Method for preparing porous mullite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 5g of fly ash, 3g of bauxite and 2g of aluminum fluoride are mixed, ball milled and dried to a median particle size of ≤10μm. Add 5% by mass of polyethylene glycol aqueous solution and 30% by mass of starch aqueous solution to the mixed powder to make a mixed slurry with a solid content of 60% by mass; after ball milling, the slurry is injected with a size of It is molded in a 15mm×25mm×140mm mold and cured at 80°C in a constant temperature drying oven. After demoulding, the dried green body is kept at 400°C for 0.5h, and then at 1500°C for 2h.

Embodiment 2

[0024] 5g of fly ash, 3.5g of bauxite and 1.5g of aluminum fluoride are mixed, and ball milled and dried to a median particle size of ≤10 μm. Add 10% by mass of polyethylene glycol aqueous solution and 40% by mass of starch aqueous solution to the mixed powder to make a mixed slurry with a solid content of 65% by mass; after ball milling, the slurry is injected with a size of Molded in a 15mm×25mm×140mm mold and cured at 70°C in a constant temperature drying oven, the dried green body after demoulding was kept at 350°C for 1.5h, and then at 1400°C for 3h.

Embodiment 3

[0026] 5g of fly ash, 4g of bauxite and 1g of aluminum fluoride are mixed, and ball milled and dried until the median particle size is less than or equal to 10 μm. Add 8% by mass of polyethylene glycol aqueous solution and 35% by mass of starch aqueous solution to the mixed powder to make a mixed slurry with a solid phase content of 70% by mass; after ball milling, the slurry is injected with a size of It is molded in a 15mm×25mm×140mm mold and cured at 75°C in a constant temperature drying oven. After demoulding, the dried body is kept at 350°C for 2 hours, and then at 1300°C for 4 hours.

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Abstract

The invention discloses a method for preparing porous mullite, which comprises the following steps of: (1) performing magnetic separation to fly ash to remove iron; (2) proportioning the iron-removed fly ash, bauxite and aluminium fluoride; (3) adding a dispersing agent and a firming agent to prepare a mixed sizing agent; (4) pouring into a mold, and demolding after heating and curing; (5) preserving the demolded dry blank at the temperature of 350-400 DEG C for 0.5-2 h; (6) preserving the temperature at 1300-1500 DEG C for 2-4 h, and cooling. The method not only greatly utilizes fly ash which is a solid pollutant to achieve the purposes of energy saving, pollution reduction and environmental protection, but also has simple technology. The prepared porous mullite ceramics have reasonable pore diameter distribution, even pore distribution, high mullite content and great high-temperature resistance, and are applicable to multiple application requirements on high and low temperatures.

Description

technical field [0001] The invention relates to a method for preparing mullite, more particularly, to a method for preparing porous mullite by using fly ash as a raw material. Background technique [0002] Mullite, as an important traditional and advanced ceramic material, has attracted much attention from the society. It has excellent thermal and mechanical properties, such as: low coefficient of thermal expansion and thermal conductivity; high fracture toughness and high temperature flexural strength; high thermal shock resistance; low dielectric constant and dielectric loss; strong resistance to Acid-base corrosion ability, etc. Porous mullite ceramics can be used in kiln refractories with heat resistance and corrosion resistance requirements, kiln furniture for various ceramic firing such as saggers, shed plates, etc., filters for molten metal, catalysts for exhaust gas purification vectors, etc. Porous ceramics currently used in filtration and catalysis are mainly si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/622C04B38/00
Inventor 杜海燕许睿李世慧杨铎
Owner TIANJIN UNIV
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