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Material Specification
Outstanding abrasion and corrosion resistance combined with high strength at
elevated temperatures are some of the unique physical characteristics of SiCon™.
Another significant property of SiCon™ is thermal conductivity of 150W/mk,
exceeding that of steel and alumina. This results in an excellent thermal shock
resistance due to the combination of high strength and low coefficient of
thermal expansion.
| Property |
SiCon™ |
Unit |
|
|
| Hardness (Vickers) |
18-23 |
GPa |
| Fracture Toughness |
3.0 - 4.0 |
MPa.m½ |
| Young's Modulus |
350-400 |
GPa |
| Max Operating Temp |
1350 |
°C |
| Coeff. of Thermal Expansion |
4.3 - 4.5 |
10-6/°C |
| Thermal Conductivity |
150 |
W/mK |
| Flexural Strength |
230 - 300 |
MPa |
| Porosity |
0 |
% |
| Density |
|
g/cm3 |
| Acid Resistance |
Excellent |
|
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 Microstructure
The optical micrograph (opposite) presents a polished cross-section of SiCon™ to
highlight the homogeneous nature of the material. The even distribution of SiC
is shown as dark regions with free Si shown as light regions. The continuous
interlocking SiC grain matrix is achieved during firing under inert atmospheric
conditions. The final product is a pure SiSiC which is not sensitive to
corrosion and is completely non-porous.
Corrosion Resistance
SiCon™ has excellent resistance in acid and base environments. For example it is
completely unaffected in acid up to 98% concentration at 80°C. Please contact
SiCon™ Operations Director - Dr. Hewett
(cathy@concordeng.com.au) with specific operating requirements.
Fracture Toughness
Concord has undertaken extensive laboratory research supported by field testing
and introduced a new mounting technique for SiCon™ ceramic to increase fracture
toughness and reduce the effect of crack propagation.
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