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Method for preparing mullite honeycomb ceramic carrier with all crystal whisker structure

A technology of honeycomb ceramic carrier and mullite, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of high environmental hazards and toxicity, and achieve good mechanical properties

Active Publication Date: 2016-10-12
董雷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic monomer used in traditional gel injection molding is generally acrylamide, which is toxic and harmful to the environment

Method used

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  • Method for preparing mullite honeycomb ceramic carrier with all crystal whisker structure
  • Method for preparing mullite honeycomb ceramic carrier with all crystal whisker structure
  • Method for preparing mullite honeycomb ceramic carrier with all crystal whisker structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Add 200g ceramic powder to 200ml water, wherein Al 2 o 3 , silicon dioxide, aluminum fluoride and molybdenum trioxide mass ratio is 68:26:3:3; Stir for 30min to obtain a uniformly dispersed ceramic slurry; add acetic acid to adjust the pH value to 1.5 in the ceramic slurry, then pour the ceramic slurry into the mold, and add glutaraldehyde that accounts for 0.6wt% of the total mass of the ceramic slurry as The initiator was left to stand at room temperature for 0.5 hours to be cured and molded, and then demoulded. The sample after demoulding was dried in an oven at 60°C for 12 hours, and then moved into a muffle furnace to raise the temperature to 1500°C at a rate of 5°C / min. 2h; The microstructure of the obtained mullite porous ceramics with full whisker structure is shown in the attached figure 2 ; The XRD pattern of the mullite honeycomb ceramic carrier held at 1500°C for 2h is shown in figure 1 .

Embodiment 2

[0020] Example 2: Add 300g ceramic powder to 200ml water, wherein Al 2 o 3 , silicon dioxide, aluminum fluoride and vanadium pentoxide in a mass ratio of 68:26:3:3; and add chitosan accounting for 0.5wt% of the total mass of the powder, and the resulting mixture is stirred magnetically at room temperature Stir with a mixer for 30 minutes to obtain a uniformly dispersed ceramic slurry; add acetic acid to the ceramic slurry to adjust the pH value to 2, then pour the ceramic slurry into the mold, and add 0.6wt% of glutaraldehyde as an initiator The agent was left to stand at room temperature for 1 hour to be cured and then demoulded. The demoulded sample was dried in an oven at 60°C for 12 hours, then moved into a muffle furnace and heated to 1500°C at a rate of 5°C / min, and kept for 2 hours. ; The microstructure of the obtained mullite porous ceramics with full whisker structure is as attached image 3 , the XRD pattern of the mullite honeycomb ceramic carrier held at 1500°C f...

Embodiment 3

[0021] Example 3: Add 300g ceramic powder to 200ml water, wherein Al 2 o 3 , silicon dioxide, aluminum fluoride mass ratio is 73:21:6; and add chitosan accounting for 0.5wt% of the total powder mass, the obtained mixture is stirred with a magnetic stirrer at room temperature for 30min, to obtain evenly dispersed Ceramic slurry; add acetic acid to adjust the pH value to 2 in the ceramic slurry, then pour the ceramic slurry into the mold, and add glutaraldehyde accounting for 0.6wt% of the ceramic slurry as an initiator, and leave it standing at room temperature for 1.5 After hours of curing and molding, the demoulded sample was dried in an oven at 60°C for 12 hours, then moved into a muffle furnace to raise the temperature to 1500°C at a rate of 5°C / min, and held for 2 hours. The porosity of the obtained full-whisker structured mullite honeycomb ceramic carrier was 77%, and the compressive strength was 16 MPa.

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Abstract

The invention belongs to the technical field of inorganic materials, and in particular relates to a method for preparing a mullite honeycomb ceramic carrier with all crystal whisker structure. The method for preparing the mullite honeycomb ceramic carrier with all crystal whisker structure comprises the following steps: using chitosan as an organic polymer monomer, and using glutaraldehyde as an initiator for preparing the mullite honeycomb ceramic carrier by combining with a mullite crystal whisker in-situ growth technology, to obtain a mullite honeycomb ceramic block material composed of crystal whiskers all growing in situ, wherein the specific steps are 1) preparation of ceramic slurry, 2) curing and molding of slurry, and 3) drying of samples and sintering of a green body. The method provided by the invention can adjust the porosity by changing the solid content of the ceramic slurry; the whole ceramic block is composed of in-situ grown mullite whiskers and has good mechanical property.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a method for preparing a mullite honeycomb ceramic carrier with a full whisker structure. Background technique [0002] The gel injection molding process is a ceramic molding process developed by the Oak Ridge National Laboratory in the United States. This process can shape the sample arbitrarily before sintering. The purpose of the gel injection molding process is to prepare dense ceramics. This process also started later Applied to the molding of porous ceramics. For example, Ma Yijuan et al. (Chinese Patent, Publication No. CN105481466A) prepared porous calcium phosphate bioceramic materials by gel injection molding process; ceramics. The gel injection molding process is to mix the ceramic powder with the polymer monomer to prepare a ceramic slurry, and then add a cross-linking agent to cross-link the polymer monomer into a three-dimensio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/185C04B35/636C04B38/00
CPCC04B35/185C04B35/636C04B35/803C04B38/0006C04B2235/3239C04B2235/3256C04B2235/445C04B2235/96C04B38/0074
Inventor 赵会峰吕皓董雷田瑞平王琦张振华黄小叶符有杰
Owner 董雷
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