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Preparation method of fully-closed pore porous mullite ceramic based on direct solidification injection molding

A technology of porous mullite and injection molding, which is applied in the direction of ceramic products, ceramic material production, clay products, etc., can solve the problems of long preparation period and difficulty in obtaining porous ceramics with fully closed-pore structure, so as to ensure excellent performance, Low equipment requirements and good combination performance

Active Publication Date: 2020-07-10
ANHUI JINYAN GAOLING SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Porous ceramics that add hollow spheres as pore-forming agents are usually prepared by gel injection molding. This process requires debinding after molding. The preparation cycle is long, and there are interconnected pores between the hollow spheres. It is difficult to obtain Porous ceramics with fully closed cell structure

Method used

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  • Preparation method of fully-closed pore porous mullite ceramic based on direct solidification injection molding

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preparation example Construction

[0026] Such as figure 1 As shown, the present invention provides a kind of fully closed cell porous mullite ceramics preparation method based on direct solidification injection molding, and the method comprises the following steps:

[0027] S1 Mix kaolin powder, fly ash hollow balls, deionized water and rheological additives, and use high-speed shearing or mechanical stirring to prepare a uniformly dispersed ceramic slurry;

[0028] S2 Add a curing agent to the ceramic slurry and mix it evenly, then degas it by vacuum degassing or centrifugal degassing to obtain a mixed slurry;

[0029] S3 inject the mixed slurry into the mold, and then heat it in a water bath at 50°C to 90°C for 0.5h to 2h to solidify it, and obtain a ceramic green body after demoulding;

[0030] S4 Dry the ceramic green body at a temperature of 50°C to 90°C for 12h to 24h, and finally place the dried ceramic green body in a sintering furnace, and sinter it at a temperature of 1350°C to 1600°C for 1h to 2h. ...

Embodiment 1

[0037] S1 Mix 45g of coal-based kaolin powder, 15g of fly ash hollow balls and 40g of deionized water, and use high-speed shearing to prepare a ceramic slurry with a solid phase content of 60wt%. The particle size of the fly ash hollow balls is 90μm;

[0038] S2 Add calcium iodate at a ratio of 8g / L to the ceramic slurry and mix evenly, then use vacuum degassing to degas it to obtain a mixed slurry;

[0039] S3 injecting the mixed slurry into a silica gel mold, keeping the temperature in a water bath at 70°C for 1 hour to solidify the mixed slurry, and obtaining a ceramic green body after demoulding;

[0040]S4 Dry the ceramic green body at 90° C. for 12 hours, and sinter it at 1550° C. for 1 hour to prepare fully closed-pore porous mullite ceramics.

Embodiment 2

[0042] S1 Mix 20g of coal-based kaolin powder, 50g of fly ash hollow balls, 30g of deionized water and 0.3g of cellulose, and use mechanical stirring to prepare a ceramic slurry with a solid phase content of 70wt%, wherein the fly ash hollow The particle size of the ball is 20μm;

[0043] S2 Add barium iodate in the proportion of 6g / L to the ceramic slurry and mix evenly, then degas it by vacuum degassing to obtain the mixed slurry;

[0044] S3 inject the mixed slurry into the silica gel mold, keep warm for 0.5h in a water bath at 90°C to solidify the mixed slurry, and obtain a ceramic green body after demoulding;

[0045] S4 The ceramic green body was dried at 65° C. for 20 hours, and sintered at 1350° C. for 2 hours to prepare fully closed-pore porous mullite ceramics.

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Abstract

The invention belongs to the field of inorganic nonmetallic ceramics, and particularly discloses a preparation method of fully-closed pore porous mullite ceramic based on direct solidification injection molding. The method comprises the following steps: mixing kaolin powder, fly ash hollow spheres, deionized water and a rheological agent to prepare uniformly dispersed ceramic slurry; adding a curing agent into the ceramic slurry, uniformly mixing, and degassing to obtain mixed slurry; injecting the mixed slurry into a mold, heating for a preset time to solidify the mixed slurry, and demoldingto obtain a ceramic biscuit; and carrying out high-temperature sintering on the dried ceramic biscuit so as to prepare the fully-closed pore porous mullite ceramic. According to the preparation method, the kaolin powder is utilized to play a role in stabilizing the slurry, and meanwhile, and gaps among the hollow spheres are filled with the kaolin powder, so that the porous ceramic with a fully-closed pore structure can be obtained, a direct solidification injection molding preparation mode is adopted, and the preparation method has the advantages of simplicity in operation, energy conservation, environmental protection, low equipment requirement, short preparation process and the like.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic ceramics, and more specifically relates to a method for preparing fully closed porous mullite ceramics based on direct solidification injection molding. Background technique [0002] Porous ceramics can be divided into open-cell type and closed-cell type according to the type of pores. Among them, closed-cell ceramics are ceramics with a closed pore structure, and the internal pores are not connected with the outside world or have poor connectivity. Due to the closed-cell structure, closed-cell ceramics have greater advantages than open-cell ceramics in thermal insulation, waterproof, and corrosion resistance. [0003] The preparation of traditional porous ceramics often uses the foaming method and the pore-forming agent method. By introducing gas, liquid or solid as the pore-forming medium, the pore-forming medium is removed during high-temperature sintering, thereby leaving pores in the ce...

Claims

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Application Information

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IPC IPC(8): C04B38/08C04B33/13C04B33/135C04B33/28
CPCC04B33/1352C04B38/08C04B33/131C04B33/1305C04B33/28C04B2235/444C04B2235/449C04B38/0061Y02P40/60
Inventor 吴甲民陈双史玉升李晨辉闫春泽张矿王永均张红星
Owner ANHUI JINYAN GAOLING SCI & TECH CO LTD
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