The thermal conductivity of silicon carbide (SiC) ceramic tiles is an important thermal performance parameter, and its specific value may vary depending on factors such as material purity, crystal structure, preparation process (such as sintering method), and temperature. The following is a brief explanation of the thermal conductivity of silicon carbide ceramic sheets:

Typical thermal conductivity range
Pure silicon carbide single crystal: The thermal conductivity is usually between 300-490 W/(m · K), close to or even exceeding copper (about 400 W/(m · K)), making it one of the best known ceramic materials for thermal conductivity.
Polycrystalline silicon carbide ceramics (such as sintered SiC or reaction sintered SiC): The thermal conductivity is generally in the range of 100-270 W/(m · K), depending on the density and impurity content.
Dense sintered SiC: approaching 200-270 W/(m · K).
Reaction sintered SiC (containing a small amount of free silicon): about 100-150 W/(m · K), which decreases slightly due to the low thermal conductivity of silicon (about 150 W/(m · K)).
influence factor
Temperature: The thermal conductivity decreases with increasing temperature. For example, at room temperature (25 ℃), it is 270 W/(m · K), which may decrease to 50-100 W/(m · K) at 1000 ℃.
Grain size and structure: Single crystal SiC has better thermal conductivity than polycrystals, and the more grain boundaries there are, the greater the thermal resistance.
Impurities and additives: If there are non thermal conductive phases (such as oxides or metal residues), the thermal conductivity will decrease.
Preparation process: SiC ceramics prepared by hot pressing sintering, pressureless sintering, or chemical vapor deposition (CVD) exhibit significant differences in performance.
Practical application reference
In industry, silicon carbide ceramic sheets are commonly used in high-temperature heat exchangers, electronic device heat dissipation substrates, etc. Taking common sintered SiC ceramic sheets as an example, the thermal conductivity is mostly between 120-200 W/(m · K), balancing high thermal conductivity and corrosion resistance.