In many high-temperature kilns, the real heat source is not an open flame, but rather a series of quietly heating pipes. They are like the “invisible sun” in a kiln, uniformly heating the workpiece through thermal radiation, which is the radiation tube. Today we are going to talk about the outstanding one -silicon carbide radiation tube.
Why use a radiation tube?
Simply put, it is for the purpose of “isolation” and “uniformity”. Place the flame or heating element inside the tube and heat the workpiece outside the tube to avoid direct contact between combustion products and the workpiece, reducing pollution; Meanwhile, the method of thermal radiation makes it easier to achieve uniform temperature throughout the entire furnace cavity, ensuring product quality.
Why choose materials like silicon carbide?
This starts with its working environment. The radiation tube needs to work at high temperatures for a long time and withstand temperature fluctuations caused by frequent furnace start-up and shutdown. At the same time, there may be corrosive gases inside the furnace. Ordinary materials either cannot withstand high temperatures or are easily corroded
The advantages of silicon carbide can precisely prescribe the right medicine. It is very resistant to high temperatures and can work stably for a long time in ultra-high temperature environments; It is also very corrosion-resistant, wear-resistant, and can resist the erosion of harsh atmospheres inside the furnace; And it has high thermal conductivity, which can quickly transfer heat and achieve uniform heating.
In addition to the material itself, the design of silicon carbide radiation tubes is also very particular.
Its shape, length, diameter, and surface radiation coating will be customized according to the specific conditions of the kiln. For example, by optimizing the surface coating, its radiation efficiency can be significantly improved, allowing heat to be absorbed by the workpiece faster and more evenly. Meanwhile, reasonable structural design can effectively reduce thermal stress and extend service life.
There are several key points to note when selecting and using silicon carbide radiation tubes.
Firstly, one should choose the appropriate material grade and specifications based on their kiln temperature, atmosphere, and heating method; Secondly, during installation, it is necessary to ensure that the gap between the pipe and the furnace body is reasonable, and the support is stable to avoid additional stress caused by thermal expansion and contraction; Again, during use, try to avoid letting cold air directly blow onto the hot pipes to reduce unnecessary thermal shock; Finally, regular inspections and maintenance are also important in order to promptly identify potential issues and ensure stable production.
In summary, silicon carbide radiation tube is an excellent high-temperature heating element that can work stably for a long time in harsh environments, helping enterprises achieve a more uniform, cleaner, and more efficient heating process.
Post time: Oct-03-2025