Temperature Resistance of Far-infrared Honeycomb Ceramic Combustion Plates
A brief overview of the temperature resistance of far-infrared honeycomb ceramic combustion plates.
Temperature Resistance of Far-infrared Honeycomb Ceramic Combustion Plates
Temperature resistance is a primary parameter for material selection and application, and the upper limit of temperature resistance varies significantly among different materials.
Temperature Resistance Comparison of Various Materials
Material | Long-Term Operating Temperature | Thermal Shock Resistance | Coefficient of Thermal Expansion (×10⁻⁶/℃) |
Cordierite | ≤1100℃ | Best | 1.5-2.5 |
Corundum-Mullite | ≤1300℃ | Good | 5.0-7.0 |
Silicon Carbide (Reaction Sintering) | ≤1300℃ | Good | 4.0-5.0 |
Silicon Carbide (Recrystallization) | ≤1500℃ | Good | 4.0-5.0 |
Alumina (95% Ceramic) | ≤1450℃ | Average | 7.0-8.0 |
Consequences of Overheating
Cordierite above 1200℃: Crystal phase transformation, plate cracking and spalling.
Corundum-mullite above 1500℃: Grain coarsening, increased brittleness.
Silicon carbide above 1350℃ (reaction sintering): Free silicon softens and deforms.
Alumina above 1550℃: Grain coarsening, decreased strength.
Thermal Shock Resistance
Thermal shock cracking is caused by thermal stress generated by the temperature difference between the inside and outside when the temperature changes abruptly.
Thermal shock resistance ranking: Cordierite > Silicon carbide > Corundum-mullite > Alumina
Cordierite has the lowest coefficient of thermal expansion, suitable for frequent start-ups and shutdowns; Silicon carbide has high thermal conductivity, quickly balancing temperature differences.
Selection Recommendations
Operating Temperature | Recommended Material |
≤1000℃, frequent start-stop | Cordierite |
1000-1200℃ | Corundum-Mullite |
1200-1350℃ | Silicon Carbide (reaction sintering) |
1350-1500℃ | Silicon Carbide (recrystallization) |
>1500℃ | Alumina (95% or higher ceramic grade) |
Summary
Temperature resistance selection can be categorized as follows: Cordierite has good thermal shock resistance but low temperature resistance (≤1100℃), suitable for frequent start-stop medium-temperature conditions; silicon carbide has high high-temperature strength (≤1500℃), suitable for stable high-temperature operation; alumina has the highest temperature resistance (≤1550℃), used for ultra-high temperatures.
Selection must consider both the maximum temperature and thermal shock frequency, with a safety margin of 100-200℃. Properly matching materials to operating conditions is fundamental for long-life operation.