Preparation method of silicon carbide ceramic tubular product
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A technology of silicon carbide ceramics and tubular products, which is applied in the field of silicon carbide ceramic materials and its preparation, to achieve the effects of long life, simple process and low cost
Inactive Publication Date: 2012-10-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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
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preparation example Construction
[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; After air-drying, remove a certain amount of organic solvent in the slurry, make the organic solvent mass content after air-drying be 1~5%, again through Curing in the air not higher than 40°C for 20 hours, it becomes a raw material that can be used for extrusion molding...
Embodiment 1
[0061] The technical indicators of the silicon carbide ceramic tube gained in the present embodiment are as follows:
[0062] Dimensions: outer diameter 10mm, wall thickness 1mm, length 1000mm; density 100%; composition 98% SiC, 2% Si; compressive strength not less than 800MPa, material thermal conductivity 140W / (m K); thermal expansion coefficient 4.6ppm, 400 cycles of air cooling at 1400°C without any damage.
[0063] Example 2
Embodiment 2
[0065] The technical indicators of the SiC honeycomb ceramic material obtained in the present embodiment are as follows:
[0066] Dimensions: outer diameter 50mm, wall thickness 5mm, length 500mm; density 70%; composition 99% SiC, 1% Si; compressive strength not less than 200MPa, material thermal conductivity 60W / (m K); thermal expansion coefficient 4.6ppm, 1400℃ cycle air cooling 300 times without any damage.
[0067] Example 3
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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 preparation method of a silicon carbide ceramic tubular product with high strength, high thermal conduction, low expansion, high thermal-shock resistance performance and controllable external dimensions. 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 forma 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 method for preparing a silicon carbide ceramic tubular product with high strength, high thermal conductivity, low expansion, high thermal shock resistance and controllable external dimensions. 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 ceramics...
Claims
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Patent Type & Authority Patents(China)
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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