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A kind of porous silicon-based structural ceramics and its preparation method

A porous silicon-based, ceramic technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of complex process equipment, unpredictable mechanical properties, and difficulty in obtaining complex-shaped ceramic parts.

Active Publication Date: 2020-10-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods based on the development of traditional mold technology are easy to obtain silicon-based structural ceramics with a certain porosity, but due to the limitation of the mold, it is difficult to obtain ceramic parts with complex shapes, and the micro / nano structure inside the part cannot be precisely controlled. The performance often fails to meet the predetermined requirements, and there are still shortcomings such as complex process equipment, long preparation cycle, and high cost.

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  • A kind of porous silicon-based structural ceramics and its preparation method

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preparation example Construction

[0025] The invention provides a method for preparing porous silicon-based structural ceramics, comprising the following steps:

[0026] nano-SiO 2 Powder and C powder are ball milled and mixed to obtain the basic powder, and the nano-SiO 2 The mass ratio of powder and C powder is 50~100:0~50;

[0027] Ball milling and mixing the basic powder with an organic solvent to obtain a prefabricated slurry with a solid phase content of 50-80 wt %;

[0028] Mix the prefabricated slurry with a photoinitiator, and shape it by light-curing additive manufacturing technology to obtain a ceramic green body;

[0029] After the ceramic green body is debinding under a vacuum atmosphere, it is then reacted and sintered under an argon and / or nitrogen atmosphere to obtain porous silicon-based ceramics.

[0030] The method is based on the photocuring additive manufacturing technology, in the way of layer stacking, through the photocuring reaction and reaction sintering of the photoinitiator, the ...

Embodiment 1

[0054] nano-SiO 2 Powder and C powder are ball milled and mixed to obtain the basic powder, in which nano-SiO 2 Powder is 80wt%, and C powder is 20wt%. Polyparaphenylene terephthalamide, hexane oxide, epoxy acrylate, 1,6-hexanediol diacrylate, epoxy cyclohexyl carboxylate, n-octanol, ethyl acetate, etc. A variety of organic solvents are mixed to make a light-curable organic solvent, and then the basic powder is added for ball milling (the ratio of material to ball is 1.5:1, the speed of ball milling is 300rad / min, and the time of ball milling is 2h) to prepare high solid phase content The prefabricated slurry, wherein the proportion of the organic solvent is 35wt%, and the proportion of the basic powder is 65%. Using top-down stereolithography molding technology, import stl-type porous 3D model files, slice and layer the 3D model, form 2D images and printing tracks, generate printing files, set the printing parameters as laser power 50W, print The layer thickness was 50 μm....

Embodiment 2

[0057] nano-SiO 2 Powder and C powder are ball milled and mixed to obtain the basic powder, in which nano-SiO 2 Powder is 55wt%, and C powder is 45wt%. Polyparaphenylene terephthalamide, hexane oxide, epoxy acrylate, 1,6-hexanediol diacrylate, epoxy cyclohexyl carboxylate, n-octanol, ethyl acetate, etc. A variety of organic solvents are mixed to make a light-curable organic solvent, and then the basic powder is added for ball milling (the ratio of material to ball is 1.5:1, the speed of ball milling is 300rad / min, and the time of ball milling is 2h) to prepare high solid phase content The prefabricated slurry, wherein the proportion of the organic solvent is 35wt%, and the proportion of the basic powder is 65%. Using top-down stereolithography technology, import stl-type porous 3D model files, slice and layer the 3D model, form 2D images and printing tracks, and generate printing files. The printing parameters are laser power 50W, printing The layer thickness was 50 μm. Ad...

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Abstract

The invention provides porous silicon-based structural ceramic and a preparation method thereof. The method comprises steps as follows: nano SiO2 powder and C powder in the mass ratio being (50-100):(0-50) are subjected to ball milling and mixed, and basic powder is obtained; the basic powder and an organic solvent are subjected to ball milling and mixed, and prepared slurry with the solid phase content being 50wt%-80wt% is obtained; the prepared slurry and a photoinitiator are mixed and formed with a photo-curing additive manufacturing technology, a ceramic biscuit is obtained, after adhesive removal is performed in a vacuum atmosphere, the ceramic biscuit is subjected to reaction and sintered in an argon and / or nitrogen atmosphere, and the porous silicon-based structural ceramic is obtained. The method is based on the photo-cured additive manufacturing technology, the porous silicon-based structural ceramic has a controllable structure and higher porosity and bending strength through a photo-curing reaction and reaction sintering of the photoinitiator in a layer-by-layer stacking and forming manner. The ceramic has the porosity being 71.1%-77.4% and the bending strength being 72.6-109.3 MPa.

Description

technical field [0001] The invention relates to the fields of high-performance ceramic preparation technology and additive manufacturing technology, in particular to a porous silicon-based structural ceramic and a preparation method thereof. Background technique [0002] High-performance silicon-based structural ceramics with SiC, Si 3 N 4 It has the advantages of high hardness, high strength, stable chemical properties, high thermal conductivity, small thermal expansion coefficient, good wear resistance, thermal shock resistance, etc. It has been widely used in aerospace, electronics, automobiles, machinery, etc. Processing, chemical metallurgy, military and other high-end technology fields. With the functional integration and application expansion of high-performance structural ceramics, porous silicon-based structural ceramics are increasingly used in special fields such as filters, catalytic carriers, and medical implants. Therefore, the structure and performance of si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/565C04B35/622C04B35/64C04B35/626C04B38/06
CPCC04B35/573C04B35/591C04B35/622C04B35/6261C04B35/6264C04B35/6269C04B35/64C04B38/068C04B2235/3418C04B2235/422C04B2235/60C04B2235/6586C04B2235/96C04B38/0067
Inventor 黄淼俊邓欣李练伍尚华陈健
Owner GUANGDONG UNIV OF TECH