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Reaction sintering silicon carbide ceramic and production method thereof

A technology of sintered silicon carbide and a production method, which is applied in the field of reaction sintered silicon carbide ceramics and its production, can solve the problems of high cost of ceramics, easy to explode, etc., and achieve good flow performance, maintain uniformity, and improve production quality and efficiency. Effect

Active Publication Date: 2008-10-22
浙江东新新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the sic powder preparation processes use ethanol as the solvent for ball milling and mixing, but the cost of ceramics produced by this process is relatively high, and explosions are prone to occur during spray granulation

Method used

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  • Reaction sintering silicon carbide ceramic and production method thereof
  • Reaction sintering silicon carbide ceramic and production method thereof
  • Reaction sintering silicon carbide ceramic and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A production method of (sic+c) reaction sintered silicon carbide ceramics, selects 94 parts of silicon carbide, 5 parts of c powder and boron and 1 part of boron and boron carbide mixture as raw materials, puts 70 parts of deionized water, and the silicon carbide is small The ball is used as the grinding medium, and 0.5 parts of polyvinyl alcohol, 2 parts of polyacrylamide and 1 part of polyacrylic acid are added, and the ball mill is mixed for 10 hours to prepare a water-based silicon carbide slurry; the water-based silicon carbide slurry is prepared by spray granulation technology Spray drying requires a hot air inlet temperature of 380°C, an outlet temperature of 110°C, and a slurry flow rate of 100 kg / hour to prepare silicon carbide composite powder granules; the silicon carbide composite powder granules are dry-pressed at 100 MPa to obtain Silicon carbide ceramic green body: put the above silicon carbide ceramic green body into a vacuum reaction sintering furnace fo...

Embodiment 2

[0024]A production method of (sic+c) reaction sintered silicon carbide ceramics, selects 81 parts of silicon carbide, 17 parts of c powder and 2 parts of boron as raw materials, the raw materials are put into 230 parts of deionized water, and the silicon carbide pellets are grinding media; Then add 2 parts of polyvinyl butyral, 0.5 parts of polyethylene glycol and 1.5 parts of aluminum phosphate, and mix it by ball milling for 20 hours to prepare a water-based silicon carbide slurry; use the spray granulation process to spray the water-based silicon carbide slurry Drying, the hot air inlet temperature is 360°C, the outlet temperature is 95°C, and the slurry flow rate is 200 kg / hour, and the silicon carbide composite powder powder pellets are prepared; the silicon carbide composite powder powder pellets are dry-pressed at 150MPa to obtain silicon carbide Ceramic green body: the silicon carbide ceramic green body is put into a vacuum reaction sintering furnace for silicon infiltr...

Embodiment 3

[0026] A kind of production method of (sic+c) reaction sintered silicon carbide ceramics, selects 90 parts of silicon carbide, 8.5 parts of c powder and 1.5 parts of boron carbide as raw material, puts said raw material into 150 parts of deionized water, and the silicon carbide ball is Grinding medium; add 3 parts of methylcellulose, 1 part of polyacrylamide and 0.5 part of polyacrylic acid, and ball mill and mix for 5 hours to form a water-based silicon carbide slurry; spray granulation process is used to process the water-based silicon carbide slurry Spray drying, hot air inlet temperature 350°C, outlet temperature 100°C, slurry flow rate 150 kg / hour; silicon carbide composite powder powder granules were prepared; silicon carbide composite powder powder granules were dry pressed at 130MPa to obtain carbonized Silicon ceramic green body: put the silicon carbide ceramic green body into a vacuum reaction sintering furnace for silicon infiltration and sintering, and keep it at 17...

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Abstract

The invention relates to reactive sintering carborundum ceramics, which is characterized in that the weight percentages of the components are as following: carborundum is 80 to 95 percent, powdered carbon is 5 to 20 percent, and sintering accessory ingredient is 1 to 2 percent. The preparation method is as following: the raw materials are put into de-ionized water and caking agent, water-soluble macromolecule mixture collosol and dispersant are added; mixing by ball milling is carried out for 5 to 20 hours to form water-based carborundum sizing agent; spray dry technique is adopted to carry out spraying and drying the sizing agent, thereby obtaining carborundum compound powder amyloplastid; the amyloplastid is carried out dry pressing to obtain carborundum ceramics biscuits; the biscuits are put into a vacuum response sintering furnace for siliconizing and sintering; preparing the reactive sintering silicon carbide ceramics at the temperature of 1500 to 1800 DEG C after heat preservation for 1 to 5 hours. The reactive sintering silicon carbide ceramics of the invention has the advantages of scientific and rational raw materials and mixture ratio, safe production method and low cost. The prepared carborundum ceramics can meet requirements of mechanical seal under special working conditions.

Description

technical field [0001] The invention relates to a reaction sintered silicon carbide ceramic and a production method thereof. technical background [0002] Ceramic sealing materials required by the mechanical sealing industry require materials with high strength, high toughness, low creep, abrasion resistance, corrosion resistance and good oxidation resistance. Silicon carbide ceramics have excellent mechanical properties, low thermal expansion coefficient and high thermal conductivity, which make silicon carbide ceramics exhibit excellent thermal shock resistance, high thermal stability, good corrosion resistance and abrasion resistance. Therefore, it is widely used as a mechanical sealing material in high-tech fields such as machinery, chemical industry, energy, and military industry. [0003] Reaction sintered silicon carbide (codenamed RBSiC) is a dense ceramic sintered body made by impregnating a carbon-containing silicon carbide ceramic green body with molten silicon. ...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 郑志荣
Owner 浙江东新新材料科技有限公司
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