Method for preparing high-temperature-resistant structural SiC porous ceramics

A porous ceramic and structural technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of small specific surface area, low mechanical strength of high-porosity ceramics, difficult to control the pore size distribution and size of porous ceramics, etc. Adjustment, excellent effect of mechanical bearing capacity

Active Publication Date: 2017-04-26
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the pore size distribution and size of porous ceramics are difficult to control, the specific surface area is small, and the mechanical strength of high-porosity ceramics is generally low in the existing methods for preparing SiC porous ceramics, so as to provide a high temperature resistant structure Preparation method of type SiC porous ceramics

Method used

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  • Method for preparing high-temperature-resistant structural SiC porous ceramics
  • Method for preparing high-temperature-resistant structural SiC porous ceramics
  • Method for preparing high-temperature-resistant structural SiC porous ceramics

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specific Embodiment approach 1

[0021] Specific implementation mode 1: This implementation mode is a method for preparing a high-temperature-resistant structural SiC porous ceramic, which is specifically completed according to the following steps:

[0022] 1. Knead the dough: use deionized water to mix the flour and yeast evenly, and knead it into a dough;

[0023] 2. Fermentation and freeze-drying: the dough is first fermented at constant temperature, and then freeze-dried to obtain porous dough;

[0024] 3. Carbonization: Carbonize the porous dough to obtain a carbon porous skeleton;

[0025] 4. Sintering: place the carbon porous skeleton on the reactive silicon source, then sinter, and then cool to room temperature to obtain high temperature resistant structured SiC porous ceramics.

[0026] In the process of SiC formation in this embodiment, the following chemical reactions will occur in the system:

[0027] SiO 2 (s)+Si(s)=2SiO(g) (1)

[0028] SiO 2 (s)+C(s)=SiO(g)+CO(g) (2)

[0029] SiO(g)+2C(s)=...

specific Embodiment approach 2

[0036] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio of flour to yeast described in step 1 is 200:(1-5). Others are the same as the specific embodiment one

specific Embodiment approach 3

[0037] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the volume ratio of the mass of flour to deionized water described in step 1 is 1g:(0.6mL-1mL). Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for preparing high-temperature-resistant structural SiC porous ceramics, belongs to the field of preparation of microwave-absorbing, environment-firendly, catalytic and biosensing semiconductor materials and energy sources and nuclear protective materials, and specifically relates to a method for preparing the SiC porous ceramics. The method aims to solve the problems that in an existing method for preparing the SiC porous ceramics, the pore size distribution and size of the porous ceramics are generally difficult to control, the specific surface area is small, and the mechanical strength of the high-porosity ceramics is low. The method includes the following steps: 1, kneading dough; 2, conducting fermentation and freeze drying to obtain porous dough; 3, conducting carbonization to obtain a porous carbon skeleton; 4, conducting sintering to obtain the high-temperature-resistant structural SiC porous ceramics. The method is mainly used for preparing the high-temperature-resistant structural SiC porous ceramics.

Description

technical field [0001] The invention belongs to the fields of wave absorption, environmental protection, catalysis, biosensing, semiconductor materials, energy and nuclear protection materials preparation, and in particular relates to a preparation method of SiC porous ceramics. Background technique [0002] Porous ceramics have very unique properties, such as light weight, large specific surface area, high temperature resistance, and stable chemical properties. They have been widely used in catalyst supports, high-temperature filters, microwave absorption, sound absorption, and bioceramics. Among them, in addition to the characteristics of low density, high porosity and large specific surface area, SiC porous ceramics also have the characteristics of SiC such as high thermal conductivity, high mechanical strength, small thermal expansion coefficient and strong thermal shock resistance. Therefore, the application of SiC porous ceramics is becoming more and more extensive. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/573
CPCC04B35/573C04B38/025C04B2235/428C04B2235/48C04B2235/96
Inventor 王志江苟永杰吴丽娜
Owner HARBIN INST OF TECH
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