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Method for preparing silicon nitride porous ceramic by gel injection moulding

A technology of porous ceramics and gel injection molding, applied in the field of porous ceramics, can solve the problems of low strength, different particle sizes, uneven distribution of pore-forming agents, etc., and achieve the effect of high porosity and high strength

Inactive Publication Date: 2009-08-12
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the current pore-forming agent method is that the specific gravity of the pore-forming agent is generally smaller than that of the ceramic raw material, and their particle sizes are often different, so the pore-forming agent cannot be uniformly distributed in the green body, resulting in poor uniformity of pore distribution and low strength.
[0008] At present, in the production of porous ceramics by gel injection molding technology, there is no need to specifically add pore-forming agents, only through the gel injection molding process, a large number of small gel molecules formed by solidification of organic monomers are oxidized and decomposed at high temperatures to form small pores and microstructures. hole research not yet

Method used

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  • Method for preparing silicon nitride porous ceramic by gel injection moulding
  • Method for preparing silicon nitride porous ceramic by gel injection moulding
  • Method for preparing silicon nitride porous ceramic by gel injection moulding

Examples

Experimental program
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Embodiment 1

[0037] Embodiment 1: A kind of method that utilizes gel casting method to prepare silicon nitride porous ceramics, this method comprises: prepare slurry, prepare green body, degrease and sinter:

[0038] (1) Preparation of slurry: 10 parts by weight of acrylamide (AM), 3 parts by weight of crosslinking agent, 1 part by weight of dispersant and 86 parts by weight of water are mixed to prepare a premix; add 45 parts by weight of nitrogen to the premix Silica powder and 7 parts by weight of sintering aid, adjust the pH value to 9, and make a slurry after ball milling for 12 hours; Al in the sintering aid 2 o 3 and Y 2 o 3 The ratio is 1:1;

[0039] (2) Preparation of green body: the slurry is vacuum degassed, adding 0.1 parts by weight of initiator, degassed again, and injected into the mold. Under the condition of 60°C, react for 50 minutes to make the slurry gel solidify and demould. ℃ and 98% humidity conditions to obtain green body;

[0040] (3) Body degreasing: The degr...

Embodiment 2

[0042] Embodiment 2: A kind of method that utilizes gel casting method to prepare silicon nitride porous ceramics, this method comprises: prepare slurry, prepare green body, degrease and sinter:

[0043] (1) Preparation of slurry: 25 parts by weight of acrylamide (AM), 8 parts by weight of crosslinking agent, 1 part by weight of dispersant and 66 parts by weight of water are mixed to prepare a premix; add 40 parts by weight of nitrogen to the premix Silica powder and 3 parts by weight of sintering aid, adjust the pH value to 11, and make a slurry after ball milling for 12 hours; Al in the sintering aid 2 o 3 and Y 2 o 3 The ratio is 1:3;

[0044] (2) Preparation of green body: the slurry is vacuum degassed, and 20 parts by weight of initiator is added, degassed again, and injected into the mold. Under the condition of 65°C, react for 30 minutes to make the slurry gel and solidify, and demould. ℃ and 98% humidity conditions to obtain green body;

[0045] (3) Body degreasin...

Embodiment 3

[0047] Embodiment 3: A kind of method that utilizes gel casting method to prepare silicon nitride porous ceramics, this method comprises: prepare slurry, prepare green body, degrease and sinter:

[0048] (1) Preparation of slurry: 25 parts by weight of acrylamide (AM), 10 parts by weight of crosslinking agent, 1 part by weight of dispersant and 64 parts by weight of water are mixed to prepare a premix; add 50 parts by weight of nitrogen to the premix Silica powder and 10 parts by weight of sintering aid, adjust the pH value to 11, and make a slurry after ball milling for 12 hours; Al in the sintering aid 2 o 3 and Y 2 o 3 The ratio is 3:1;

[0049] (2) Preparation of green body: the slurry is degassed in vacuum, 10 parts by weight of initiator is added, degassed again, and injected into the mold. Under the condition of 65°C, react for 60 minutes to make the slurry gel and solidify, and demould. ℃ and 98% humidity conditions to obtain green body;

[0050] (3) Body degreasi...

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Abstract

The invention discloses a method for preparing silicon nitride porous ceramic by a gel mold injection method. The method comprises slurry preparation, blank preparation and degreasing and sintering of the blank to obtain the silicon nitride porous ceramic with porosity ranging from 49 to 63 percent, buckling strength ranging from 54 to 234MPa and pore-size distribution ranging from 0.1 to 1.0 mum. The method can prepare the silicon nitride porous ceramic with high performance and high strength only by utilizing numerous gel micromolecules formed by organic monomer solidification in a high temperature oxidation decomposition process. The porous ceramic prepared by the method has fine pores and narrow pore-size distribution. Meanwhile, the method can prepare porous ceramic products with large size and complicated shape.

Description

(1) Technical field: [0001] The invention belongs to the field of porous ceramics, and relates to a gel injection molding method for preparing high-performance silicon nitride porous ceramics. (two) background technology: [0002] As a new type of material with excellent performance and broad prospects, porous ceramics are widely used in petroleum, chemical industry, environmental protection, metallurgy, machinery, mining, food, medicine, biology, aerospace, aviation and other fields. Especially in the chemical industry, porous ceramics, as filter materials, are widely used in water purification, oil separation and filtration, organic solutions, acid-base solutions, other viscous liquids and compressed air, coke oven gas, steam, methane, acetylene, etc. Gas separation and filtration. Compared with the traditional filter press dehydration method, the use of porous ceramics has outstanding advantages in terms of energy saving, environmental protection, and dehydration effect ...

Claims

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Application Information

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IPC IPC(8): C04B35/624C04B35/584C04B35/622
Inventor 王红洁余娟丽张健张大海严友兰浑丙利乔冠军
Owner XI AN JIAOTONG UNIV
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