EN
Description
These RBSiC/SiSiC components for heat treatment includes flame tubes(aslo called inner radiation tubes)and outer radiation tubes and silicon carbide recuperators (also called heat exchanging tubes), which work togehter as one unit. Silicon carbide (SiC) flame tubes/pipes are the inner radiation tubes. The flame tubes (diffusers) function as a guide for the flow of combustion and combustion gas in single-ended radiant tube applications. The shape can be custom engineered to promote excellent temperature uniformity.
Traditional indirect heating mainly uses metal or its alloy as the radiation heating tube of the heating system, but so far, the upper limit of the operating temperature of the vast majority of metal radiation tubes is only 1000 ℃, which cannot meet the higher heating temperature requirements of many processes. The main problem currently exists in the reliability of long-term use in higher temperatures and more complex media. Reaction sintered silicon carbide flame tubes/pipes can be stably used in various corrosive media at a high temperature of 1380 ℃ for a long time.
Specifications
KCE® SiSiC/RBSiC Technical Data Sheet
| Technical Parameters | Unit | Value |
| Silicon Carbide content | % | 85 |
| Free Silicon content | % | 15 |
| Bulk Density 20°C | g/cm³ | ≥3.02 |
| Open Porosity | Vol % | 0 |
| Hardness HK | kg/mm² | 2600 |
| Flexural Strength 20°C | MPa | 250 |
| Flexural Strength 1200°C | MPa | 280 |
| 20 – 1000°C (Coefficient of Thermal Expansion) | 10–6 K–1 | 4.5 |
| Thermal Conductivity 1000°C | W/m.K | 45 |
| Static 20°C(Modulus of Elasticity ) | GPa | 330 |
| Working temperature | °C | 1300 |
| Max. Service Temp (air) | °C | 1380 |
Applications
Silicon carbide (SiC) flame tubes/pipes together with outer radiation tubes and silicon carbide recuperators have important applications in the field of high-temperature heat treatment, gas indirect heating is an important method in the sintering, melting, heat treatment of metal materials and glass industries and petrochemical industries etc.
Advantages
Silicon carbide (SiC) flame tubes/pipes can be used as high-temperature heaters and heating elements, capable of withstanding environments above 1300 ℃. Meanwhile, they have excellent mechanical strength and high thermal conductivity, which can significantly improve the efficiency of heat treatment equipment. Utilizing its high thermal conductivity (5 times that of stainless steel), radiation tubes, flame tubes etc. made of silicon carbide ceramics achieve efficient heat transfer in the heat treatment industries.
Compared with direct combustion heating, indirect gas heating can greatly improve thermal efficiency and reduce the emission of harmful gases such as NO. At the same time, it improves the stability of temperature and ensures control over the atmosphere inside the furnace; At the same time, in many industrial heating processes, it is required to isolate the workpiece from the combustion environment. All of this requires indirect radiation heating.
