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SiC honeycomb ceramics material and preparation method thereof

A honeycomb ceramic and honeycomb-shaped technology, which is applied in the field of SiC honeycomb ceramic material and its preparation, can solve the problems of low strength, difficulty in mold manufacturing, easy deformation during sintering, etc., and achieve the effect of good strength and controllable honeycomb pore shape.

Active Publication Date: 2012-08-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are many problems in the preparation of SiC honeycomb ceramics by the current extrusion molding process, such as poor molding precision, high possibility of deformation, and cracking; mold manufacturing is difficult, wear is serious, and the life is low; the organic components must be completely released during the drying process, and the control is not easy. The green body is damaged, easy to deform during sintering, and the strength is not high. The above reasons lead to high material preparation costs and low performance, which limits the popularization and application of this kind of honeycomb ceramics.

Method used

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  • SiC honeycomb ceramics material and preparation method thereof
  • SiC honeycomb ceramics material and preparation method thereof

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[0037] The preparation method of the honeycomb ceramic material of the present invention has a simple process and mainly includes raw material preparation, molding of a molding unit, assembly, pyrolysis and firing processes.

[0038] The preparation method uses solid particle powder and high-molecular materials with high carbon yield as raw materials, and is molded to prepare a single-layer honeycomb unit combination, followed by pyrolysis and sintering. The specific preparation process is as follows:

[0039] (1) Mix solid particle powder (silicon carbide powder, silicon powder or both mixed powder), polymer material, curing agent and organic solvent in a certain proportion, ball mill after mechanical stirring, and filter to obtain slurry. The solute of the slurry solution is 5-80% of the total mass; afterward, a certain amount of organic solvent in the slurry is removed by air-drying, so that the mass content of the organic solvent after air-drying is between 10-15%.

[0040] ...

Embodiment 1

[0050] Co-dissolve silicon carbide powder with an average particle size of 5 μm, aminophenol-formaldehyde resin, and p-toluenesulfonic acid with a mass ratio of 60%: 35%: 5%, respectively, in absolute ethanol, ball mill after mechanical stirring, and filter to obtain a slurry. The solute in the slurry solution is 80% of the total mass; air-dried to remove a certain amount of ethanol in the slurry, so that the mass content of the organic solvent after air-drying is 10%. Coat this raw material evenly on the polyvinyl alcohol non-woven fabric, and then spread it on one side of the split mold with triangular slots heated to 120°C, close the mold and press to the limit, and the limit between the molds Ensure that the gap is 0.3mm, keep warm for 1 minute and then solidify. Open the mold to get a corrugated single-layer honeycomb unit with triangular grooves. After preparing several units in this way, stack these units with slurry and cure. After solidification, the honeycomb ceramic...

Embodiment 2

[0054] Co-dissolve silicon carbide powder with an average particle size of 5 μm and silicon powder with an average particle size of 3 μm, aminophenol-formaldehyde resin, and p-toluenesulfonic acid with a mass ratio of 50%: 10%: 35%: 5% in absolute ethanol, and mechanically stir After ball milling and filtering, a slurry is obtained. The solute in the slurry solution is 75% by mass, and air-dried to remove a certain amount of ethanol in the slurry, so that the mass content of the organic solvent after air-drying is 15%. Coat this raw material evenly on the polyvinyl alcohol non-woven fabric, and then squeeze it through the wavy toothed pair of rollers heated to 150°C. The gap between the upper and lower rollers is 0.3mm, and the rolling speed is 1m / After 1 min, a corrugated single-layer honeycomb unit with wavy grooves is obtained. After preparing several units in this way, these units are stacked and bonded with slurry. After solidification, the honeycomb ceramic prefabricated...

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Abstract

The invention belongs to the field of a porous ceramic material and a preparation technology thereof, particularly relates to a SiC honeycomb ceramics material which is thin in porous wall, high in strength, high in specific surface, low in expansion, high in heat conductivity, high in thermal shock resistance, and controllable in structure and a preparation method of the SiC honeycomb ceramics material. The SiC honeycomb ceramics material has a continuous and single integrated structure which is similar to the shape of a honeycomb, and is provided with a plurality of in-parallel passageways along the axial direction, wherein the shapes of the passageways can be triangular, wavelike and the like; the number of pores in each unit area, which form into a honeycomb structure, can be controlled in a range of 100 / cm<2> to 5 / cm<2>, and the thickness of the pore walls can be controlled in a range of 0.2mm to 2mm; the pore walls can be in an impact structure, and have a micro-pore structure as well; and the invention takes organic resin and SiC powder as main raw material, and the main raw material is prepared into a single-layer structure by a mould pressing technology and is assembled into the honeycomb structure, and is reacted, infiltrated and sintered into a final product after being pyrolyzed. The preparation technology provided by the invention is simple in technology, convenient to operate, free from complex equipment, and low in manufacture cost.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic materials and their preparation, specifically a SiC honeycomb ceramic material with porous thin walls, high strength, high specific surface area, low expansion, high thermal conductivity, high thermal shock resistance, and controllable structure and its preparation method. Background technique [0002] Honeycomb ceramics have a continuous and single overall structure, and there are many parallel channels along the axial direction. The shape of the channels can be circular, square, triangular, hexagonal, wavy, etc., and it is named because it resembles a honeycomb structure. Therefore, compared with general bulk ceramics, honeycomb ceramics have the characteristics of high porosity, large specific surface area, strong corrosion resistance, and light weight; It has the advantages of large surface area, small volume specific gravity, small pressure drop, small diffusion distance, and is condu...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/00
Inventor 张劲松田冲杨振明曹小明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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