Green preparation method of light high-strength cordierite porous ceramic and filter

A technology of porous ceramics and cordierite, which is applied to the green preparation method of light-weight high-strength cordierite porous ceramics and the field of filters, can solve the problems of cracking of micro-cracked products, unfavorable environmental protection, many kinds of additives, etc. Improve compressive strength and thermal shock resistance, and reduce drying shrinkage

Inactive Publication Date: 2020-01-10
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the acrylamide system requires many types of additives and a relatively large amount of additives, which is very unfavorable to environmental protection.
In addition, during the preparation of porous ceramics, there is often a large drying shrinkage during the drying and sintering process of the green body. First, it brings difficulties in manufacturing products with complex shapes. Second, it is necessary to design and prepare large molds or subsequent processing in consideration of shrinkage. These Both increase the manufacturing cost
In addition, large shrinkage often causes microcracks in the material or directly leads to cracking of the product, which affects the yield of the product and brings high manufacturing costs

Method used

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  • Green preparation method of light high-strength cordierite porous ceramic and filter
  • Green preparation method of light high-strength cordierite porous ceramic and filter
  • Green preparation method of light high-strength cordierite porous ceramic and filter

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preparation example Construction

[0044] The green preparation method of the lightweight high-strength cordierite porous ceramic material according to the embodiment of the present invention, such as figure 1 shown, including the following steps:

[0045] Step S10, mixing magnesium oxide, aluminum oxide, and silicon dioxide according to the stoichiometric ratio of cordierite to obtain a mixed powder, adding it to a certain volume of deionized water and mixing it to form a slurry;

[0046] Step S20, subjecting the slurry to foaming treatment to obtain foam slurry;

[0047] Step S30, injecting the foam slurry into a mold for freeze-drying;

[0048] Step S40, sintering the dried green body to obtain the lightweight high-strength cordierite porous ceramic.

[0049] In other words, according to some specific embodiments of the present invention, magnesium oxide, aluminum oxide, and silicon dioxide are used as raw materials to prepare light-weight and high-strength cordierite porous ceramic materials. The mixed p...

Embodiment 1

[0074] It is configured into a slurry of 15vol.%, the total volume of the slurry is 200ml, and gelatin accounting for 8wt% of the total mass of raw material powder is adopted. Magnesium oxide (purity 99.9%) with a particle size of 50nm, aluminum oxide (purity 99.99%) with a particle size of 300nm, and silicon dioxide (purity 99.4%) with a particle size of 10 μm, according to the cordierite stoichiometric ratio (Mg 2 Al 4 Si 5 o 18 ) for batching, then add 2wt% dispersant (ammonium polyacrylate) and 140ml deionized water of the total mass of the raw material powder, and ball mill and mix the mixture for 17h on a roller ball mill (rotating speed is 100rpm). Heat and dissolve the gelatin with 30ml of deionized water, then stir the previously mixed slurry and gelatin solution at a low speed of 450rpm to make it evenly mixed; then add 2g / L of foaming agent (sodium lauryl sulfate) to carry out For foaming, gradually increase the speed and stabilize it to 1200rpm. After stirring f...

Embodiment 2

[0077] It is configured into a 20vol.% slurry, the total volume of the slurry is 200ml, and gelatin accounting for 8wt% of the total mass of the raw material powder is used. Magnesium oxide (purity 99.9%) with a particle size of 50nm, aluminum oxide (purity 99.99%) with a particle size of 300-500nm, and silicon dioxide (purity 99.4%) with a particle size of 10 μm, according to the cordierite stoichiometric ratio (Mg 2 Al 4 Si 5 o 18 ) for batching, then add 4wt% dispersant (ammonium polyacrylate) and 130ml deionized water of the total mass of raw material powder, and ball mill and mix the mixture for 17h on a roller ball mill (rotating speed is 100rpm). Heat and dissolve the gelatin with 30ml of deionized water, then stir the previously mixed slurry and gelatin solution at a low speed of 450rpm to make it evenly mixed; then add 2g / L of foaming agent (sodium lauryl sulfate) to carry out For foaming, gradually increase the speed and stabilize it to 1200rpm. After stirring for...

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Abstract

The invention provides a green preparation method and a filter for a lightweight high-strength cordierite porous ceramic. The preparation method comprises the following steps: step S10, mixing magnesium oxide, aluminum oxide and silicon dioxide according to a cordierite stoichiometric ratio to obtain mixed powder, adding the mixed powder into deionized water with a certain volume, ball milling andmixing to prepare slurry; step S20, foaming the slurry to obtain foam slurry; step S30, injecting the foam slurry into a mold for freeze drying; step S40, sintering the dried green body to obtain thelightweight high-strength cordierite porous ceramic. According to the invention, the green preparation method is small in additive dosage used and environment-friendly, the size change from injectionmolding to sintering is less than 2% (the bus shrinkage range is-1.87% to 0.45%), and the method accords with the technical characteristic of green preparation.

Description

technical field [0001] The invention relates to a preparation method of porous ceramics, more specifically, to a green preparation method and a filter of lightweight high-strength cordierite porous ceramics. Background technique [0002] Due to its low thermal expansion coefficient, good thermal stability and high permeability, porous cordierite ceramics have broad application prospects in molten metal filtration, high temperature soot filtration, automobile exhaust filtration and particle supplementation. However, it is difficult to combine high strength and high porosity with common preparation techniques, and it is difficult to prepare products with complex shapes due to large sintering shrinkage. Although the newly developed foam injection method can solve the above problems, the commonly used gel system is an acrylamide system, and the polymerization of this system needs to add a crosslinking agent (N, N-methylenebisacrylamide) and an initiator ( ammonium persulfate, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/195C04B35/622C04B35/636C04B35/64C04B38/10B01D39/20B28B1/50B28B11/24
CPCB01D39/2093B28B1/50B28B11/243C04B35/195C04B35/622C04B35/636C04B35/64C04B38/10C04B2235/3206C04B2235/3217C04B2235/3418C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/6023C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/77C04B2235/96C04B2235/9615C04B38/0067C04B38/0074
Inventor 李翠伟李俊文李昊武令豪付梦丽王涵
Owner BEIJING JIAOTONG UNIV
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