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Silicon Carbide (SiC)|Ceramics materials


Silicon Carbide (SiC)

Silicon Carbide (SiC)

  • Silicon Carbide (SiC)

  • Silicon Carbide (SiC)

    Silicon carbide (SiC) is a material that can withstand high temperatures of 1400℃ and higher and is resistant to thermal shock. Additionally, compared to other fine ceramics, SiC is outstanding in its chemical stability and corrosion resistance.
    SiC has a high Young's modulus elasticity and a small coefficient of thermal expansion, so it is used for parts that require dimensional accuracy even under a harsh, heated environment.
    Recently, SiC is increasingly used as a heater peripheral part because of its high thermal conductivity. Two grades are available: the normal grade (A-SiC) that can be used in semiconductor equipment and the special one (SiC-3N), 99.9% of SiC that minimizes the impurities of heavy metals.

  • Features

  • Applications


ASUZAC offers high-purity silicon carbide (SiC-3N) grades, in addition to general silicon carbide (A-SiC).
Please choose the one that best serves your application.

  • SiC Features

    Silicon Carbide (A-SiC)

    This is general SiC with high temperature resistance, high strength, high rigidity and high mechanical strength.

    High Purity Silicon Carbide (SiC-3N)

    SiC-3N has the same degree of purity as normal SiC (A-SiC), but the difference is that SiC-3N contains less impurities of heavy metals.

High Purity Silicon Carbide (SiC-3N)

SiC-3N is a material that contains little heavy metal content.
Compared with our normal SiC (A-SiC), the purity is the same, but the content of heavy metals in SiC-3N is reduced.
High Purity Silicon Carbide (SiC-3N)
  • Comparison of Impurities - SiC-3N vs A-SiC

    Comparison of Impurities - SiC-3N vs A-SiC
    ※A-SiC is general SiC originally developed by ASUZAC.

SiC Bonding Technology

ASUZAC has a technique for bonding high-purity SiC components without using an adhesive.
(SiC is resistant to high temperatures and heat shock, and chemically stable).
Formerly, green machining and grinding alone had difficulty in shaping a complicated geometry (like paths for liquid or gas) into a single structural body.
This bonding technique, however, has made it possible to manufacture such a complicated structural part without using any adhesives.
Because of this innovation, customers do not need to buy any more multiple parts to be assembled, which contributes to enhancing product reliability as one integrated component. Also customers can enjoy saving their time and money that would otherwise be spent on assembling a number of parts.
  • Nozzle for heat and corrosion resistant

    Nozzle for heat and corrosion resistant

  • Nozzle for heat and corrosion resistant

  • Gas heat exchange fluid circuit.

    Gas heat exchange fluid circuits.

If you are looking for a particular type of SiC, please consult us.
Depending on the shape and specifications, we may ask you to modify the specifications or we may propose some alternative ideas, but even if you do not reach a specific design concept yet, contact us first and we can work out the details together.

Property Comparision Table (SiC and others)

  ASiC SiC3N Alumina Corseed Alsima L
Purity % - 99.9 99.6 - -
Color - Black Black Ivory Dark gray Gray
Density g/cm3 3.14 3.19 3.94 4.24 2.41
Mechanical Properties Flexual strength MPa 410 450 370 310 146
Young's modulus GPa 430 446 390 288 115
Vicker's hardness GPa
14.7 10 6.5
Poisson's ratio 0.17 0.17 0.24 0.27 0.29
Fracture toughness MPa m1/2 2~3 2~3 4 3 1.4
Thermal Properties Coefficient of thermal expansion x10-6
[Normal temperature ~ 800℃]
4.1 4.1 7.7 8.8 2.1
Thermal conductivity W/(m•K)
32 5.5 2.9
Specific heat J/(kg•K) 0.68×103 0.57×103 0.78×103 0.67×103 0.75×103
Electric Properties Dielectric constant [1MHz] 10.2 - 4.8
Dielectric loss tangent x10-4[1MHz] 70 - 50
Volume resistivity Ω・cm 5×106 5×108 >1015 1 >1014
Voltage resistance kV/mm 13 - 14.5
Optical Properties Light reflectivity
[Wavelength: 240~2,600nm, Surface roughness Ra 0.8]
- 10.0~26.6 -
Features, application, etc.   - High thermal resistivity
- High strength
- High corrosion resistivity
- Anti-static properties
- High thermal resistivity
- High strength
- High corrosion resistivity
Anti-static properties
- High strength
- High electric insulation
- Anti-corrosion resistivity
- High thermal conductivity
(in reducing atmosphere)
- Low thermal expansion
- High thermal resistivity
- Shock resistance
- Low thermal conductivity
- Used as a heat insulating material
* Regarding fracture toughness, only Alsima L and Corseed were measured by SEVNB methods, and others by SEPB methods.

Comparative example of physical properties of SiC between ASUZAC and other manufacturers

Manufacturer   ASUZAC ASUZAC Company A Company B Company C
Product name   ASiC SiC3N
Manufacturing method   Sintering by normal pressure Sintering by normal pressure Hot Pressing CVD Si-SiC
Density g・cm3 3.15 3.18 3.15 3.21 3.05
Vicker's hardness   28 28 22 26
Flexual strength Mpa 410 450 600 590 220
Elasticity Gpa 430 430 390 450 280
Fracture toughness Mpa/cm^0.5 2.5 2.5 4.4
Thermal expansion E-6/K 4.1 4.1 4.3 4 4.8
Thermal conductivity W/m•K 170 140 230 250 225
* The above figures are reference values that may vary depending on product shape and usage.
* Reflectivity varies depending on the wavelength of light. Please contact us for details.
* Regarding fracture toughness, only Alsima L and Corseed were measured by SEVNB methods, and others by SEPB methods.

Experiment on Heat Shock Resistance by dropping a heated test piece into water to see how much SiC can withstand rapid temperature change.

Contact Us

Customizable from single quantity orders.
Please feel free to contact us.

  • ASUZAC Inc.
    Fine Ceramics Division


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    FAX : +81-26-251-2160

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