COMPONENTS FOR THERMAL PLANT ENGINEERING, SPECIFICALLY FURNACE LININGS, HIGH-TEMPERATURE METROLOGY AND KILN FURNITURE
Thermal process engineering, with its wide variety of processes, poses severe challenges to the thermal, corrosion and wear resistance of the components and the materials they are made of. For thermal plant engineering, ESK offers various components made from its own material EKasic® silicon carbide.
Applications
Typical applications of the components manufactured by ESK are furnace linings, structural parts for furnace construction, burners, thermocouple sheaths and protective tubes for radiant heaters.
Product Property
EKasic® F is the 99 % sintered silicon carbide (SiC) from ESK, with a unique range of properties that is superior to metals and other ceramics:
- Heat resistance up to 1800°C
- Universal corrosion resistance
- High thermal conductivity
- Very good thermal shock resistance
EKasic® F from ESK thus allows new thermal plant engineering technologies to be realized cost effectively.
| Silicon Carbide | |||||
| Material properties | Norm | Symbol/Unit | EKasic® F |
EKasic® F plus |
EKasic® T |
| Density | DIN EN 623-2 | ρ [g/cm3] | >3.10 | >3.16 | >3.21 |
| Porosity | DIN EN 623-2 | P [%] | <3.0 | <1.0 | <1.0 |
| Mean grain size | [μm] | <5 | <5 | <2 | |
| Grain size distribution | [μm] | ||||
| Phase composition | α-SiC | α-SiC | α-SiC, YAG |
||
| Vickers hardness | DIN EN 843-4 | HV 1 [GPa] | 25.5 | 25.5 | 22.5 |
| Knoop hardness | DIN EN 843-4 | HK 0.1 [GPa] | 24.5 | 24.5 | 21.0 |
| Young's modulus | DIN EN 843-2 | E [GPa] | 410 | 420 | 420 |
| Weibull modulus | DIN EN 843-5 | m | 10 | 15 | 15 |
| Flexural strength, 4-pt bending |
DIN EN 843-1 | σB [MPa] | 400 | 510 | 550 |
| Compressive strength | σD [MPa] | 2200 | 2200 | 2500 | |
| Poisson ratio | ν | 0.17 | 0.17 | 0.16 | |
| Fracture toughness (SENB) |
Klc [MPa·m0,5] | 4 | 4 | 6 | |
| Coefficient of thermal expansion |
DIN EN 821-1 | ||||
| 20°C - 500°C | α [10-6/K] | 4.1 | 4.1 | 3.5 | |
| 500°C - 1000°C | α [10-6/K] | 5.2 | 5.2 | 5.2 | |
| Specific heat at 20°C | DIN EN 821-3 | cp [J/g K] | 0.6 | 0.6 | 0.6 |
| Thermal conductivity at 20°C |
DIN EN 821-2 | λ [W/mK] | 125 | 125 | 75 |
| Thermal stress parameters |
calculated | ||||
| R1 = σB·(1-ν) / (α·E) | R1 [K] | 198 | 246 | 314 | |
| R2 = R1·λ | R2 [W/mm] | 25 | 31 | 24 | |
| Specific electrical resistance at 20°C |
DIN EN 50359 | ρ [Ω cm] | 106-108 | 106-108 | 102-103 |
| Silicon Carbide | |||||
| Material properties | Norm | Symbol/Unit | EKasic® C |
EKasic® P |
EKasic® G |
| Density | DIN EN 623-2 | ρ [g/cm3] | >3.10 | >2.76- 2.89 |
>3.02 |
| Porosity | DIN EN 623-2 | P [%] | <3.0 | 10-14 | <3.0 |
| Mean grain size | [μm] | bimodal | <5 | bimodal | |
| Grain size distribution | [μm] | 10-1500 | 10-1000 | ||
| Phase composition | α-SiC | α-SiC | α-SiC, graphite |
||
| Vickers hardness | DIN EN 843-4 | HV 1 [GPa] | 25.5 | 23.5 | 24.5 |
| Knoop hardness | DIN EN 843-4 | HK 0.1 [GPa] | 24.5 | 21.6 | 23.0 |
| Young's modulus | DIN EN 843-2 | E [GPa] | 410 | 340 | 390 |
| Weibull modulus | DIN EN 843-5 | m | 10 | 15 | 14 |
| Flexural strength, 4-pt bending |
DIN EN 843-1 | σB [MPa] | 400 | 225 | 230 |
| Compressive strength | σD [MPa] | 2500 | 2000 | 2500 | |
| Poisson ratio | ν | 0.17 | 0.17 | 0.16 | |
| Fracture toughness (SENB) |
Klc [MPa·m0,5] | 3.5 | 3 | 3 | |
| Coefficient of thermal expansion |
DIN EN 821-1 | ||||
| 20°C - 500°C | α [10-6/K] | 4.1 | 3.5 | 4.0 | |
| 500°C - 1000°C | α [10-6/K] | 5.2 | 5.6 | 5.0 | |
| Specific heat at 20°C | DIN EN 821-3 | cp [J/g K] | 0.6 | 0.6 | 0.6 |
| Thermal conductivity at 20°C |
DIN EN 821-2 | λ [W/mK] | 125 | 90 | 110 |
| Thermal stress parameters |
calculated | ||||
| R1 = σB·(1-ν) / (α·E) | R1 [K] | 198 | 157 | 124 | |
| R2 = R1·λ | R2 [W/mm] | 25 | 14 | 14 | |
| Specific electrical resistance at 20°C |
DIN EN 50359 | ρ [Ω cm] | 103-104 | 106-108 | 103-104 |
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