The Importance of Daily Maintenance of Quartz Tubes in the Operation of High-Temperature Tube Furnaces
The temperature resistance of a quartz tube is directly related to its purity: the higher the purity, the greater the temperature resistance. Tube furnaces are an excellent choice for dynamic sintering applications in laboratories. The quartz tube, as a critical component of the tube furnace, plays an indispensable role. Outstanding firing performance, a modern aesthetic design, and high reliability are the hallmarks of this type of electric furnace. The furnace features a split-design chamber, facilitating easy replacement of the heating tube while ensuring safety, reliability, energy efficiency, and environmental friendliness.
2019-11-11
Tube furnace It is an excellent choice for dynamic sintering applications in the laboratory. The quartz tube, one of the critical components of a tube furnace, plays an indispensable role. Outstanding sintering performance, a modern aesthetic design, and high reliability are the hallmarks of this type of electric furnace. The furnace features a split-design chamber, facilitating easy tube replacement, while ensuring safety, reliability, energy efficiency, and environmental friendliness.
The tubular furnace consists of a heating furnace body and a waste-heat recovery system. The furnace body is equipped with a chimney damper, and a high-temperature flue-gas outlet is located below the damper. The waste-heat recovery system includes an air preheater, which is characterized by being composed of two sections: a non-condensing air preheater and a condensing air preheater. Tubular furnaces are primarily used in colleges and universities, research institutes, and industrial and mining enterprises for laboratory experiments and small-batch production. They feature safety and reliability, simple operation, high temperature-control accuracy, excellent heat insulation, a wide temperature range, uniform furnace temperature, multiple heating zones, optional atmosphere control, and vacuum furnace configurations.
Tube furnace Due to its unique structure, the furnace tube is a critical component and serves as the reaction chamber during production and testing, with the working area directly influenced by the gas, pressure, and operating procedures. Therefore, during the operation of a tube furnace, it is essential to pay close attention to the proper use and maintenance of the quartz tube:
1. The softening point of quartz tube softening should not be maintained at the limit for an excessively long period.
2. In general, it is not recommended for customers to introduce hydrogen into a tube furnace, except when the non-hydrogen gas content is below the lower explosive limit. If hydrogen at concentrations above the explosive limit must be introduced, stringent safety measures must be implemented: no personnel should stand at either end of the furnace tube during gas flow; and stainless steel tubing must be used for hydrogen service. Because stainless steel has a higher thermal conductivity than quartz, the ends of the stainless steel tube must be water-cooled; otherwise, the O-rings will overheat and lose their sealing capability.
3. Keep the furnace tube clean and free of contaminants; no substances that can react with SiO2 should be allowed to remain inside. When firing materials, to extend the service life of the furnace tube, do not place the materials directly on the tube—instead, use a boat-shaped crucible to hold them.
4. During heating, be sure to insert ceramic furnace plugs into the furnace tube; otherwise, the temperatures at both ends of the tube will be excessively high, causing the O-rings in the flanges to fail to withstand such elevated temperatures and resulting in poor gas tightness. Inserting plugs at both ends of the furnace helps establish a more uniform temperature profile.
5. During heating, be sure to insert alumina furnace plugs into the furnace tube—place two on each end, for a total of four. The distance between the inner ends of the plugs on both sides should be approximately 450 mm. If no plugs are used, the temperatures at both ends of the furnace tube will be higher, causing the O-rings in the flanges to fail to withstand the elevated temperatures and resulting in poor gas tightness. Installing furnace plugs at both ends of the tube helps establish a more uniform temperature profile.
6. The temperature resistance of quartz tubes is related to their purity: the higher the purity, the higher the temperature resistance.
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