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Pore gradient silicon carbide porous ceramic and preparation method thereof

A technology of gradient silicon carbide and porous ceramics, which is applied in the direction of ceramic products, other household utensils, household utensils, etc., can solve the problems affecting the use effect of porous ceramics, and achieve the effect of high ceramic yield

Inactive Publication Date: 2013-08-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are easy to generate closed pores in the sintering process, which affects the use effect of porous ceramics

Method used

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  • Pore gradient silicon carbide porous ceramic and preparation method thereof
  • Pore gradient silicon carbide porous ceramic and preparation method thereof
  • Pore gradient silicon carbide porous ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a pore-gradient silicon carbide porous ceramic, calculated with the total mass of added silicon carbide powder as 100 parts, the specific steps are:

[0025] 1) Add 20 parts of 10 μm fine silicon carbide powder, 80 parts of coarse silicon carbide powder and 5 parts of polycarbosilane into the xylene solution, then ball mill and mix for 3 hours to obtain a cloudy solution; then remove the solvent in the cloudy solution, Obtain silicon carbide powder coated with polycarbosilane, grind and pass through a 100-mesh sieve;

[0026] 2) Add 40 parts of 10 μm fine silicon carbide powder, 60 parts of coarse silicon carbide powder and 5 parts of polycarbosilane into the xylene solution, then ball mill and mix for 3 hours to obtain a cloudy solution; then remove the solvent in the cloudy solution, Obtain silicon carbide powder coated with polycarbosilane, grind and pass through a 100-mesh sieve;

[0027] 3) Add 100 parts of 10 μm fine silicon carbide powder ...

Embodiment 2

[0033] A method for preparing a pore-gradient silicon carbide porous ceramic, calculated with the total mass of added silicon carbide powder as 100 parts, the specific steps are:

[0034] 1) Add 20 parts of 10 μm fine silicon carbide powder, 80 parts of coarse silicon carbide powder and 5 parts of polycarbosilane into the xylene solution, then ball mill and mix for 3 hours to obtain a cloudy solution; then remove the solvent in the cloudy solution, Obtain the silicon carbide powder that is coated with polycarbosilane, grind and cross 100 mesh sieves; figure 2 middle left part;

[0035] 2) Add 100 parts of 10 μm fine silicon carbide powder and 5 parts of polycarbosilane to the xylene solution, then ball mill and mix for 3 hours to obtain a cloudy solution; then remove the solvent in the cloudy solution to obtain polycarbosilane-coated Silicon carbide powder, ground and passed through a 100-mesh sieve; figure 2 middle right part and image 3 middle left part;

[0036] 3) A...

Embodiment 3

[0041] A method for preparing a pore-gradient silicon carbide porous ceramic, calculated with the total mass of added silicon carbide powder as 100 parts, the specific steps are:

[0042] 1) Add 20 parts of 10 μm fine silicon carbide powder, 80 parts of coarse silicon carbide powder and 5 parts of polycarbosilane into the xylene solution, then ball mill and mix for 3 hours to obtain a cloudy solution; then remove the solvent in the cloudy solution, Obtain silicon carbide powder coated with polycarbosilane, grind and pass through a 100-mesh sieve;

[0043] 2) Add 100 parts of 10 μm fine silicon carbide powder and 5 parts of polycarbosilane to the xylene solution, then ball mill and mix for 3 hours to obtain a cloudy solution; then remove the solvent in the cloudy solution to obtain polycarbosilane-coated Silicon carbide powder, ground and passed through a 100-mesh sieve;

[0044] 3) Add 100 parts of 10 μm fine silicon carbide powder, 5 parts of carbon powder and 5 parts of polyc...

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Abstract

The invention relates to a pore gradient silicon carbide porous ceramic and a preparation method thereof, and belongs to the technical field of preparation of porous ceramic. The pore gradient silicon carbide porous ceramic comprises polycarbosilane and silicon carbide powder, wherein a total weight of the silicon carbide powder is calculated as 100 parts, and the polycarbosilane accounts for 2-10 parts; the pore gradient silicon carbide porous ceramic can also comprise 5-15 parts of powdered carbon; the silicon carbide powder comprises fine silicon carbide powder, crude silicon carbide powder or a mixture of fine silicon carbide powder and crude silicon carbide powder. According to the invention, the pore gradient silicon carbide porous ceramic can be prepared at a low temperature; porous ceramic of various shapes can be prepared; a ceramic precursor has high ceramic yield; the prepared pore gradient silicon carbide porous ceramic has controllable three dimensional communicating pores, and distribution of which can be designed; and pore gradient silicon carbide porous ceramic in large size can be prepared.

Description

technical field [0001] The invention relates to a pore gradient silicon carbide porous ceramic and its preparation technology, which belongs to the technical field of preparation of porous ceramic materials. Background technique [0002] Silicon carbide porous ceramics have excellent properties such as high temperature resistance, oxidation resistance, thermal shock resistance, and corrosion resistance. They have very broad application prospects in the fields of filters, catalyst carriers, heat exchangers, electrodes, and sensors. The preparation process of silicon carbide porous ceramics generally includes partial sintering method, foaming method, organic foam impregnation method, sol-gel method, etc. Pore ​​gradient ceramics are a type of porous ceramics. Compared with traditional uniform materials, it has obvious inhomogeneity, so the porosity, pore size and strength of the material present a unique distribution state in the thickness direction of the material. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 谭成文于晓东王扬卫王富耻马壮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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