Silicon carbide (SiC) does indeed have high thermal conductivity.
The thermal conductivity of SiC ranges from 120 to 270 W/mK.
In single-crystalline forms, it can reach up to 490 W/mK.
This high thermal conductivity is a significant property that contributes to its use in various high-temperature applications.
4 Key Points Explained
1. Thermal Conductivity Values
The thermal conductivity of silicon carbide is notably high.
It typically ranges from 120 to 270 W/mK.
This range is significantly higher than that of common steels and cast iron.
In specific forms, such as single-crystalline SiC, the thermal conductivity can be as high as 490 W/mK.
2. Dependence on Temperature and Preparation Method
The thermal conductivity of SiC does decrease with increasing temperature.
The preparation method of SiC significantly influences its thermal conductivity.
Recrystallized and liquid-phase sintered materials exhibit lower thermal conductivity (about 30 - 40 W/(m∙К)) compared to single-crystalline forms.
3. Applications Benefiting from High Thermal Conductivity
The high thermal conductivity of SiC makes it ideal for numerous applications.
Examples include fixed and moving turbine components, heat exchangers, and semiconductor process equipment.
These applications benefit from SiC's ability to efficiently conduct heat.
4. Comparison with Other Materials
Compared to other materials like silicon nitride, SiC has a higher thermal conductivity.
Silicon nitride exhibits anisotropic thermal properties and reduced thermal conductivity, especially at high temperatures.
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