Preparation method for porous silicon nitride ceramic

A technology of silicon nitride ceramics and silicon nitride powder, which is applied in the field of material science, can solve the problems of low strength of porous silicon nitride ceramics, long debinding process time, and small porosity of the product, and achieve high bending strength and debinding. The effect of short time and high production efficiency

Active Publication Date: 2014-07-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods all use a single gel injection molding method, and the porous silicon nitride ceramics produced have low strength, complicated drying environment, and a long time for the debinding process.
However, when the porous silicon nitride ceramics are prepared by adding a pore-forming agent, the compact molding process is required, so the porosity of the product is small

Method used

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  • Preparation method for porous silicon nitride ceramic
  • Preparation method for porous silicon nitride ceramic
  • Preparation method for porous silicon nitride ceramic

Examples

Experimental program
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Embodiment 1

[0031] The preparation of porous silicon nitride ceramics comprises the following steps:

[0032] (1) Preparation of gel: Mix 2 parts by weight of plasticizer, 15 parts by weight of monomer, and 2.5 parts by weight of crosslinking agent with 100 parts by weight of deionized water to prepare a premix; in the premix Add 0.5 parts by weight of dispersant, 95 parts by weight of silicon nitride powder and 5 parts by weight of sintering aid, adjust the pH to 8, and then prepare a gel after ball milling for 4 hours;

[0033] (2) Adding a pore-forming agent: adding 15 parts by weight of a pore-forming agent to the prepared gel, and stirring evenly;

[0034] (3) Forming of green body: The slurry with pore-forming agent is vacuum degassed, 0.08 parts by weight of initiator and 0.5 parts by weight of catalyst are added, vacuum degassed again and then injection molded, and the reaction is carried out at room temperature for 50 Minutes later, the gel is cross-linked and solidified, and th...

Embodiment 2

[0040] The preparation of porous silicon nitride ceramics comprises the following steps:

[0041] (1) Preparation of gel: Mix 2 parts by weight of plasticizer, 15 parts by weight of monomer, and 2.5 parts by weight of crosslinking agent with 100 parts by weight of deionized water to prepare a premix; in the premix Add 0.5 parts by weight of dispersant, 95 parts by weight of silicon nitride powder and 5 parts by weight of sintering aid, adjust the pH to 9, and then prepare a gel after ball milling for 8 hours;

[0042] (2) Adding a pore-forming agent: add 5 parts by weight of a pore-forming agent to the prepared gel, and stir mechanically so that the pore-forming agent is evenly distributed in the gel;

[0043] (3) Forming of green body: The slurry with pore-forming agent is vacuum degassed, 0.08 parts by weight of initiator and 0.5 parts by weight of catalyst are added, vacuum degassed again and then injection molded, and the reaction is carried out at room temperature for 50 ...

Embodiment 3

[0049] The preparation of porous silicon nitride ceramics comprises the following steps:

[0050] (1) Preparation of gel: Mix 2 parts by weight of plasticizer, 15 parts by weight of monomer, and 2.5 parts by weight of crosslinking agent with 100 parts by weight of deionized water to prepare a premix; in the premix Add 0.5 parts by weight of dispersant, 95 parts by weight of silicon nitride powder and 5 parts by weight of sintering aid, adjust the pH to 11, and then prepare a gel after ball milling for 12 hours;

[0051] (2) Adding a pore-forming agent: add 10 parts by weight of a pore-forming agent to the prepared gel, and stir mechanically so that the pore-forming agent is evenly distributed in the gel;

[0052] (3) Forming of green body: the slurry with pore-forming agent is vacuum degassed, 0.09 parts by weight of initiator and 0.5 parts by weight of catalyst are added, vacuum degassed again and then injection molded. Minutes later, the gel is cross-linked and solidified, ...

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Abstract

The invention provides a preparation method for porous silicon nitride ceramic. The preparation method comprises the following steps: preparation of gel; addition of a pore forming agent; molding of a green body; drying of the green body; sintering of the green body; etc. The method combines a gel-casting and a pore forming agent addition process together and has the advantages of simple process, low cost and substantially shortened gel discharge time; and the prepared porous silicon nitride ceramic has great porosity, high bending strength and good mechanical properties.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a method for preparing porous silicon nitride ceramics by combining gel injection molding and adding a pore-forming agent. Background technique [0002] Porous silicon nitride ceramic material is a functional and structural integrated ceramic material, which not only has the functionality of porous ceramics, such as good dielectric properties, uniform broadband permeability, large specific surface area, etc.; it also has the function of silicon nitride ceramics properties, such as high porosity, high bending strength, high temperature resistance, wear resistance, rain erosion resistance, good thermal shock resistance and so on. [0003] Due to the excellent comprehensive performance of porous silicon nitride ceramic materials, it is widely used in petrochemical, metallurgical machinery, biomedicine, aerospace and other fields, especially with the rapid development of aerospace in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622C04B38/08
Inventor 应国兵王鹏举田宝娜王乘吴玉萍李嘉赵海伟
Owner HOHAI UNIV
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