Fiber enhanced silicon carbide porous ceramic and preparation method and application thereof

A porous ceramic and fiber-reinforced technology, applied in the direction of ceramic products, chemical instruments and methods, applications, etc., can solve the problems of low toughness and limited applications, achieve high flexural strength, expand the scope of practical applications, and improve the flexural strength Effect

Inactive Publication Date: 2013-05-08
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the low toughness of porous ceramics limits its application

Method used

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  • Fiber enhanced silicon carbide porous ceramic and preparation method and application thereof
  • Fiber enhanced silicon carbide porous ceramic and preparation method and application thereof
  • Fiber enhanced silicon carbide porous ceramic and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First prepare mullite fiber slurry, heat and stir 4g sodium carboxymethyl cellulose and sufficient deionized water to boil until the total weight of the solution is 200g to obtain a 2% sodium carboxymethyl cellulose solution, and then add 40g of sodium carboxymethyl cellulose The mullite fiber is added to the 2% CMC solution in a small amount and multiple times (5-8 times), initially dispersed, and then ball milled to obtain a uniform mullite fiber slurry.

[0055] First mix the ceramic binder (mainly composed of 64.53% potassium feldspar, 12.20% kaolin and 23.27% quartz) and mullite fiber slurry at a mass ratio of 1:1, and then add Silicon carbide particles, stirred and mixed evenly, put them in an oven at 80°C for 2 hours to semi-dry, then added graphite and activated carbon as pore-forming agents, stirred and mixed evenly, and then pressed into tablets under a molding pressure of 3MPa. Sintered at a temperature of 1300°C.

[0056] The test results are: use 230μm...

Embodiment 2

[0058] First mix the ceramic binder (the main components are potassium feldspar 64.53%, kaolin 12.20% and quartz 23.27%) and the mullite fiber slurry prepared in Example 1 in a mass ratio of 1:2, and then add the average Silicon carbide particles with a particle size of about 230 μm, stirred and mixed evenly, then placed in an oven at 80°C for 2 hours to semi-dry, then added graphite and activated carbon as pore-forming agents, stirred and mixed evenly, and then molded under a molding pressure of 3MPa The lower tablet is formed and sintered at a temperature of 1300°C.

[0059] The test results are: use 230μm silicon carbide particles, add 10% ceramic binder and mullite fiber slurry with a mass fraction of 2 times the binder, and add a pore-forming agent with a mass fraction of 10% (5% graphite + 5% activated carbon), after forming at 3MPa and sintering at 1300℃, the porosity of the prepared support is 30%, and the bending strength is 34.91MPa.

Embodiment 3

[0061] First mix the ceramic binder (mainly composed of potassium feldspar 64.53%, kaolin 12.20% and quartz 23.27%) and the mullite fiber slurry prepared in Example 1 in a mass ratio of 1:3, and then add the average Silicon carbide particles with a particle size of about 230 μm, stirred and mixed evenly, then placed in an oven at 80°C for 2 hours to semi-dry, then added graphite and activated carbon as pore-forming agents, stirred and mixed evenly, and then molded under a molding pressure of 3MPa The lower tablet is formed and sintered at a temperature of 1300°C.

[0062] The test results are: use 230μm silicon carbide particles, add 10% ceramic binder and mullite fiber slurry with a mass fraction of 3 times the binder, and add a pore-forming agent with a mass fraction of 10% (5% graphite + 5% activated carbon), after forming at 3MPa and sintering at 1300℃, the porosity of the prepared support is 30.36%, and the bending strength is 35.66MPa.

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Abstract

The invention discloses fiber enhanced silicon carbide porous ceramic which is composed of the following components in part by weight: 1 part of a ceramic binder, 1-3 parts of mullite fiber pulp, 8 parts of silicon carbide particles with an average particle size being about 230microns, and 1 part of a pore-forming agent. The preparation method is implemented through the steps that firstly, homogeneous mullite fiber pulp is prepared, so that when the mullite fiber pulp is mixed with a binder and silicon carbide particles with large particle sizes, mullite fibers can be uniformly dispersed but not agglomerated, thereby achieving a good toughening effect in a ceramic matrix. The invention further discloses an application of the fiber enhanced silicon carbide porous ceramic in the aspects of preparing silicon carbide porous ceramics and improving the toughness of silicon carbide porous ceramics.

Description

[0001] The invention was funded by the National High-tech Research and Development Program (863 Program) (No.2012 AA03 A610) fund project. technical field [0002] The invention belongs to the technical field of porous ceramic filter supports, and relates to a method for preparing silicon carbide porous ceramics for high-temperature filter supports, more specifically, a method for improving the bending strength of silicon carbide porous ceramics for high-temperature filter supports. Background technique [0003] Silicon carbide has a very high melting point, flexural strength, fracture toughness and thermal conductivity, while having a low coefficient of thermal expansion and density. Therefore, silicon carbide is a ceramic material with good high temperature strength, strong thermal shock resistance, good thermal conductivity and corrosion resistance. Silicon carbide is widely used in high-temperature furnace linings, rocket nozzles and thermal barrier coatings for gas turb...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/565C04B35/622C04B38/06B01D46/24
Inventor 邓湘云孙扬善王传方王依山付卫国李德军李建保
Owner TIANJIN NORMAL UNIVERSITY
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