The thermal resistance of SiC is not directly stated in the provided references, but it can be inferred from the information given about its thermal conductivity and thermal expansion.
Thermal resistance is the reciprocal of thermal conductivity, which measures how effectively a material conducts heat.
SiC has a high thermal conductivity ranging from 120 to 270 W/mK, which indicates low thermal resistance.
Explanation:
1. Thermal Conductivity of SiC
SiC is noted for its high thermal conductivity, which ranges from 120 to 270 W/mK.
This high conductivity is due to its strong covalent bonds and the arrangement of silicon and carbon atoms in a tetrahedral lattice.
The high thermal conductivity allows heat to be distributed evenly across the material, reducing the buildup of thermal gradients and thus enhancing its ability to withstand thermal shocks.
2. Thermal Expansion of SiC
The thermal expansion coefficient of SiC is relatively low, at 4.0x10-6/°C.
Low thermal expansion means that the material expands and contracts less with temperature changes, reducing the internal stresses that can lead to cracking or failure during rapid temperature fluctuations.
This property, combined with high thermal conductivity, contributes to SiC's excellent thermal shock resistance.
3. Thermal Shock Resistance
Thermal shock resistance is the ability of a material to withstand rapid temperature changes without sustaining damage.
SiC's combination of high thermal conductivity and low thermal expansion makes it highly resistant to thermal shock.
This resistance is crucial in applications involving high temperatures and rapid temperature changes, such as in semiconductor electronics, rocket nozzles, and heat exchangers.
4. Applications of SiC
Due to its favorable thermal properties, SiC is used in various high-temperature applications where thermal stability and resistance to thermal shock are essential.
Examples include lining blocks and bricks for blast furnaces, heat exchangers, and components in combustion engines and electric vehicles.
In summary, while the specific value of thermal resistance is not provided, the high thermal conductivity and low thermal expansion of SiC indicate that it has low thermal resistance, making it an excellent material for applications requiring thermal stability and resistance to thermal shock.
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