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Silicon Carbide (SiC)

SiC Material Properties

Actually, it's more and more widely used in various industries with critical application situation.

Silicon carbide has the highest corrosive resistance of all the advanced ceramic materials.  thermal conductivity, thermal shock resistance and very low thermal expansion properties. It's widely applied in Semiconductor processing like polysilllicon reactors, wafer polishing, etching, CVD etc.It also retains  its strength at temperatures as high as 1400°C and offers excellent wear resistance and thermal shock resistance.It behaves almost like a diamond. It is not only the lightest, but also the hardest ceramic material and has excellent thermal conductivity, low thermal expansion and is very resistant to acids and lyes.

Worth knowing:

Properties of Silicon Carbide (SSiC / SiSiC)

  • Low density (3.07 to 3.15 g/cm3)

  • High hardness (HV10 ≥ 2,200 GPa)

  • High Young’s modulus (380 to 430 MPa)

  • High thermal conductivity (120 to 200 W/mK)

  • Low coefficient of linear expansion (3.6 to 4.1x10-6/K at 20 to 400°C)

  • Excellent thermal shock resistance of SiSiC: ΔT 1,100 K

  • Erodible

  • Corrosion and wear resistant even at high temperatures

  • Toxicologically safe

  • Good gliding properties

Aluminiumoxid Gefügebild

Silicon carbide is available in two forms, reaction bonded and sintered. Both materials are ultra hard and have a high thermal conductivity. This has led to silicon carbide being used in bearing and rotary seal applications where the increased hardness and conductivity improves seal and bearing performance.
Dynamic sealing technology using friction bearings and mechanical seals, for instance in pumps and drive systems.Compared to metals, silicon carbide enables highly economical solutions with longer tool life when used with aggressive, high-temperature media. Silicon carbide ceramics are also ideal for use in demanding conditions in ballistics, chemical production, energy technology, paper manufacturing and as pipe system components.

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