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Aluminium nitride reinforced sibicon carbide ceramic and its preparation method

A technology of silicon carbide ceramics and aluminum nitride, which is applied in the field of aluminum nitride-reinforced silicon carbide ceramics and its production, can solve the problems of high cost and explosion-prone ceramics, achieve good fluidity, inhibit growth, and protect the health of workers Effect

Inactive Publication Date: 2007-07-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because aluminum nitride and water will react under mechanical stirring, most of the processes for preparing silicon carbide ceramics using aluminum nitride as a sintering aid use ethanol as a solvent for ball milling, but the ceramics produced by this process High cost, prone to explosion during spray granulation

Method used

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  • Aluminium nitride reinforced sibicon carbide ceramic and its preparation method

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Embodiment 1

[0022] Embodiment 1, a kind of production method of aluminum nitride reinforced silicon carbide ceramics, select 94 parts of silicon carbide, 5 parts of aluminum nitride and 1 part of yttrium oxide as raw materials, carry out the following steps successively:

[0023] 1) Put the above raw materials into 70 parts of deionized water, and use silicon carbide balls as the grinding medium; then add 0.5 parts of polyvinyl alcohol, 2 parts of polyacrylamide and 1 part of polyacrylic acid, and mix for 10 hours after ball milling to form a water-based SiC paste;

[0024] 2) Use the spray granulation process to spray dry the above water-based silicon carbide slurry, requiring hot air inlet temperature of 300-400°C, outlet temperature of 80-90°C, and slurry flow rate of 100 kg / hour; the prepared silicon carbide powder grain;

[0025] 3) Carry out two-step molding of the above-mentioned silicon carbide powder-making granules, that is, sequentially adopt 100-150 MPa dry pressure pre-press...

Embodiment 2

[0028] Embodiment 2, a kind of production method of aluminum nitride reinforced silicon carbide ceramics, select 81 parts of silicon carbide, 17 parts of aluminum nitride and 2 parts of yttrium oxide as raw materials, carry out the following steps successively:

[0029] 1) Put the above raw materials into 230 parts of deionized water, and use silicon carbide balls as the grinding medium; add 2 parts of polyvinyl butyral, 0.5 parts of polyethylene glycol and 1.5 parts of aluminum phosphate, and mix for 20 hours after ball milling. into water-based silicon carbide slurry;

[0030] 2) Spray-dry the above-mentioned water-based silicon carbide slurry by spray granulation process, the hot air inlet temperature is 300-350°C, the outlet temperature is 80-90°C, and the slurry flow rate is 200 kg / hour to prepare silicon carbide powder granules ;

[0031] 3) Carry out two-step molding of the above-mentioned silicon carbide granules, that is, sequentially adopt 100-150MPa dry pressure pr...

Embodiment 3

[0034] Embodiment 3, a kind of production method of aluminum nitride reinforced silicon carbide ceramics, select 90 parts of silicon carbide, 8.5 parts of aluminum nitride and 1.5 parts of yttrium oxide as raw materials, carry out the following steps successively:

[0035] 1) Put the above raw materials into 150 parts of deionized water, and use silicon carbide balls as the grinding medium; then add 3 parts of methylcellulose, 1 part of polyacrylamide and 0.5 part of polyacrylic acid, and mix them by ball milling for 5 hours to prepare water Silicon carbide based slurry;

[0036]2) The above-mentioned water-based silicon carbide slurry was spray-dried by spray granulation process, the hot air inlet temperature was 350°C, the outlet temperature was 80-90°C, and the slurry flow rate was 150 kg / hour to prepare silicon carbide powder granules;

[0037] 3) Carry out two-step molding of the above-mentioned silicon carbide powder-making granules, that is, sequentially adopt 100-150 M...

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Abstract

The invention relates to an aluminum nitride reinforced SiC ceramics, and its weight percentage composition of: SiC 80% ~ 94%, aluminum nitride 5% ~ 19%, yttrium oxide 1% ~ 2%. The invention also open the ceramics production methods, including the following steps : 1) all of the above components as raw added into deionized water, then add the binder, mixture of water-soluble polymer and dispersant, milling 5 ~ 20 hours, then form water-based silicon carbide slurry; 2) use spray granulation process to treat water-based silicon carbide slurry for spray drying, made of SiC powder; 3) using dry-press precompression and cold isostatic pressing final pressure to silicon carbide powder to obtain SiC blank; 4) put the SiC blank into vacuum pressureless sintering furnace, at 1950 ~ 2200 deg for 1 ~ 5 hours, gain enhanced aluminum nitride silicon carbide ceramics. The ceramic made by this method can meet the mechanical seal requirement of special conditions.

Description

technical field [0001] The invention relates to an aluminum nitride reinforced silicon carbide ceramic and a production method thereof. Background technique [0002] The ceramics required by the mechanical seal 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, and also have high thermal stability, good corrosion resistance and abrasion resistance. Therefore, it can be widely used in the field of mechanical seal rings. [0003] Due to the chemical bond characteristics of silicon carbide, its ceramic sintering conditions are relatively harsh. The emergence of atmospheric pressure sintering has made the industrial production of silicon carbide ceramics widely realized. Atmosp...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B35/634
Inventor 郭兴忠杨辉高黎华傅培鑫马奇李海淼
Owner ZHEJIANG UNIV
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