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Silicon carbide ceramic tubular product and preparation method thereof

A technology for silicon carbide ceramics and tubular products is applied in the field of silicon carbide ceramic materials and their preparation. Strong interaction, easy to process effects

Inactive Publication Date: 2009-11-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of the methods mentioned above can prepare SiC tubular products, while others cannot. There are various problems in forming and sintering, such as high cost of hot pressing process, limited tube shape, low efficiency, low yield, and poor performance. Stable, the performance of the slurry casting molded product is not high, the process repeatability is poor, especially the precision is poor during molding, and the possibility of deformation and cracking is high

Method used

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  • Silicon carbide ceramic tubular product and preparation method thereof

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preparation example Construction

[0045] The preparation method of the silicon carbide ceramic tube of the present invention has a simple process and mainly includes raw material preparation, extrusion molding, drying, high-pressure densification and homogenization, pyrolysis and firing processes.

[0046] The preparation method uses solid particle powder and high-molecular materials with high carbon yield as raw materials. After air-drying and aging treatment, a tubular prefabricated body is prepared in an extrusion molding die, and then a high-pressure compaction is carried out in a hot isostatic press. After melting, pyrolysis and sintering, the specific preparation process is as follows:

[0047] (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. Slurry solution solute is 5~70% (preferably range is 40~70%) of total mass; Afte...

Embodiment 1

[0060] Blend silicon carbide powder with an average particle size of 5 μm and phenolic resin with a mass ratio of 65%: 35%, and then add p-toluenesulfonic acid (accounting for 5% of the resin mass), and then co-dissolve in absolute ethanol, and mechanically stir After ball milling and filtering, the slurry is obtained, and the solute of the slurry solution is 70% of the total mass; air-dried to remove certain ethanol in the slurry, so that the air-dried organic solvent mass content is 1%, and then the above-mentioned slurry is heated at room temperature Aging for 20 hours. Put the above-mentioned raw materials into the inner cavity of the extrusion mold and extrude them, so that the raw materials are extruded from the annular outlet under the mold to form a tubular prefabricated body, and then dried in an oven at 50°C for 60 minutes; then the dried The tubular prefabricated body is subjected to 1000MPa, 240°C high-pressure densification and homogenization in a hot isostatic pr...

Embodiment 2

[0064] Blend silicon carbide powder with an average particle size of 5 μm and silicon powder with an average particle size of 3 μm and phenolic resin with a mass ratio of 50%: 10%: 40%, and then add toluenesulfonic acid (accounting for 2% of the mass of the resin), and then co-dissolve In absolute ethanol, after mechanical stirring, ball milling, filtering, to obtain a slurry, the solute of the slurry solution is 60% of the total mass; air-drying removes a certain amount of ethanol in the slurry, so that the mass content of the organic solvent after air-drying is 5% %, then the above slurry was aged at 35°C for 20 hours. Put the above-mentioned raw materials into the inner cavity of the extrusion mould, extrude the raw materials from the annular outlet under the mold to form a tubular prefabricated body, and then dry them in an oven at 80°C for 20 minutes; The tubular prefabricated body is subjected to 600MPa, 400°C high-pressure densification and homogenization in a hot isost...

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Abstract

The invention belongs to the technical fields of a silicon carbide ceramic material and a preparation method thereof, in particular relates to a silicon carbide ceramic tubular product with high strength, high thermal conduction, low expansion, high thermal-shock resistance performance and controllable external dimensions and a preparation method thereof. The silicon carbide ceramic tubes have even texture and uniform tubular wall thickness; the thickness of each tubular wall can be controlled from 0.5 mm to 20 mm, each tubular outer diameter can be from 5 mm to 100 mm, the silicon carbide ceramic tube with the longest length is limited by a sintering furnace, and each tubular wall can be in a compact structure or a micropore structure. The silicon carbide ceramic tubular product uses organic resin and SiC powder as main raw materials and utilizes an extrusion molding technology to prepare a tubular precast blank which is compacted and equalized at a high temperature, pyrolysed to form a final product after reaction, infiltration and sintering. The silicon carbide ceramic tubular product has the fundamental characteristics of SiC ceramics, such as high strength, low thermal expansion coefficient, high thermal conduction, chemical corrosion resistance, oxidation resistance, good high temperature stability, strong thermal-shock resistance performance, and the like. The preparation method has simple technology, convenient operation, no complicated equipment and low manufacture cost.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide ceramic materials and preparation thereof, in particular to a silicon carbide ceramic tubular product with high strength, high thermal conductivity, low expansion, high thermal shock resistance and controllable external dimensions and a preparation method thereof. Background technique [0002] Silicon carbide ceramics have the characteristics of high thermal conductivity, small expansion coefficient, small bulk density, high hardness, good wear resistance, high temperature resistance, good chemical stability, and high strength, so they are suitable for high temperature, corrosion, and oxidation environments. At present, Silicon carbide ceramics have been developed products such as bricks, flame shields, shed panels have been widely used in ceramics, electric porcelain, grinding wheels, metallurgy and other fields. At present, the two major problems facing the application of silicon carbide...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 张劲松田冲曹小明杨振明刘强李明天
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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