Method for preparing large-aperture three-dimensional network SiC ceramic material

A three-dimensional network, ceramic material technology, applied in the field of ceramic materials, can solve the problems of easy generation of wall pores, containing closed pores, and many closed pores, etc., to achieve the effect of improving the strength of the green body, improving the degree of connectivity, and easy to organize production.

Active Publication Date: 2013-11-20
山东东大新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are also obvious: first, the pore size and pore shape depend on the pore size and pore shape of the template; secondly, the synthesis steps are relatively cumbersome, in addition to the ceramic sintering steps, some also involve template preparation and pretreatment, Including pore forming, carbonization and other steps; in addition, the template skeleton used to prepare macropores is generally thicker, affected by solid diffusion reactions, silicidation and carbothermal reduction are generally incomplete, and the introduction of excessive reactants will cause carbonization of the finished product The impurity of silicon ceramics, in order to obtain purer silicon carbide materials, post-processing steps are inevitable
However, using various sponges as templates will easily generate wall holes (left after the decomposition of the sponge skeleton), which is not conducive to improving the mechanical properties of the sintered ceramics.
Therefore, these methods all have disadvantages such as complex process, high cost and closed pores, and their use is limited to a certain extent.
However, the current template-free method to prepare porous materials mainly has the disadvantages of high cost, poor three-dimensional connectivity, many closed pores, and small pore size, so it is not widely used.

Method used

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  • Method for preparing large-aperture three-dimensional network SiC ceramic material
  • Method for preparing large-aperture three-dimensional network SiC ceramic material
  • Method for preparing large-aperture three-dimensional network SiC ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Mix SiC powder with B 4 C powder is mixed at a mass ratio of 99:1, ammonia water, sucrose, acrylamide, N,N-methylenebisacrylamide and water ball mill are added to form a SiC mixed slurry;

[0037] (2) Add surfactants accounting for 0.8‰ of SiC mixed slurry mass, 8% foaming agent hydrogen peroxide and 8% polyvinyl alcohol aqueous solution as binders to SiC mixed slurry, SiC mixed slurry and The mass ratio of the binder is 1:1, stir evenly, then add the initiator, continue to stir for 30s, then foam the gel at 80°C for 1h, transfer to -17°C for 4h, and then at room temperature, Using absolute ethanol or industrial ethanol as the extractant, extract the water in the frozen slurry once for 8 hours, and then dry it at 100°C for 4 hours to obtain a foaming gel;

[0038] (3) Under the protection of an inert atmosphere, the foamed gel was sintered at 1950 ° C for 1 hour to obtain a large-pore three-dimensional network SiC ceramic material. The scanning electron microscope ...

Embodiment 2

[0043] (1) Mix SiC powder with B 4 C powder is mixed at a mass ratio of 99:1, ammonia water, sucrose, acrylamide, N,N-methylenebisacrylamide and water ball mill are added to form a SiC mixed slurry;

[0044] (2) Add surfactants accounting for 2.0‰ of SiC mixed slurry mass, 8% foaming agent hydrogen peroxide and 8% polyvinyl alcohol aqueous solution as binders to SiC mixed slurry, SiC mixed slurry and The mass ratio of the binder is 1:1, stir evenly, then add the initiator, continue to stir for 30s, then foam the gel at 80°C for 1h, transfer to -17°C for 4h, and then at room temperature, Using absolute ethanol or industrial ethanol as the extractant, extract the water in the frozen slurry once, each extraction time is 8h, and then dry at 100°C for 4h to obtain a foaming gel;

[0045] (3) Under the protection of an inert atmosphere, the foamed gel was sintered at 1950 ° C for 1 hour to obtain a large-pore three-dimensional network SiC ceramic material. The scanning electron mic...

Embodiment 3

[0050] (1) Mix SiC powder with B 4 C powder is mixed at a mass ratio of 99:1, ammonia water, sucrose, acrylamide, N,N-methylenebisacrylamide and water ball mill are added to form a SiC mixed slurry;

[0051] (2) Add surfactants accounting for 3.2‰ of SiC mixed slurry mass, 6% foaming agent hydrogen peroxide and 8% polyvinyl alcohol aqueous solution as binders to SiC mixed slurry, and SiC mixed slurry The mass ratio to the binder is 1:0.75, stir evenly, then add the initiator, continue to stir for 40s, foam at 70°C for 1h, transfer to -15°C for 12h, and then freeze at room temperature , using absolute ethanol or industrial ethanol as the extractant, extracting the water in the frozen slurry twice, each extraction time is 6h, and then drying at 100°C for 4h to obtain a foaming gel;

[0052] (3) Under the protection of an inert atmosphere, heat-preserve and sinter the foamed gel at 2000°C for 0.8h to obtain a large-aperture three-dimensional network SiC ceramic material. The sca...

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Abstract

The invention belongs to the technical field of ceramic materials, and in particular relates to a method for preparing a large-aperture three-dimensional network SiC ceramic material. The method comprises the following steps of: mixing SiC powder and B4C powder; adding ammonia hydroxide, sugar, acrylamide, N,N-methylene bisacrylamide and water in a ball milling manner to form a SiC mixed slurry; adding a surfactant, a foaming agent hydrogen peroxide and an adhesive into the SiC mixed slurry, uniformly stirring, and adding an initiator gel for foaming to obtain foaming gel; insulating and sintering the foaming gel for 0.5-1 hour at 1,950-2,040 DEG C in an inert atmosphere to obtain the large-aperture three-dimensional network SiC ceramic material. According to the method, a macropore three-dimensional network silicon carbide can be prepared, the size of apertures can be controlled by controlling the concentration and dosage of polyvinyl alcohol, and the porosity and aperture can be controlled by controlling the dosage of the hydrogen peroxide solution, and the communication performance of macropores can be effectively improved by using the surfactant. The method is simple and reliable, does not need high fixed investment, and has an excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a method for preparing a large-aperture three-dimensional network SiC ceramic material. Background technique [0002] Silicon carbide porous ceramic is a kind of ceramic material with both structure and function. It not only has the excellent performance of ceramic matrix, but also has large porosity, pore surface area and adjustable pore shape, pore size, and pore size. It is distributed in three-dimensional space and has connectivity. At the same time, it also has matching thermal, electrical, magnetic, optical and chemical properties. The more attractive application of silicon carbide ceramics with a macroporous structure is that it can be used as a filter material for gases, liquids (such as molten metal), and solid particles under harsh environmental conditions, as a catalyst carrier, and can also be used in Solar receptor materials, physical and chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B38/02
Inventor 茹红强赵菁王伟岳新艳
Owner 山东东大新材料研究院有限公司
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