Quartz tube heating is heat transfer, according to the law of conservation of heat, some heat will be lost during heat transfer; while the electromagnetic heater is to let the metal object barrel itself generate heat, there is no loss of thermal energy, and therefore more energy-efficient . The following small series introduces quartz tube heating principle and quartz tube characteristics for everyone.
Quartz tube heating principle
The quartz tube is a milk quartz glass tube processed by a special process and equipped with a resistor combined material as a heating element. The milky quartz glass can absorb almost all the visible light and near-infrared light emitted from the heating wire and can be converted into Far infrared radiation. However, the current industrial infrared heating tube basically eliminates the milky white quartz tube, because its material is relatively brittle, so it can not form a long milky heating tube. Milky white has a shading effect that blocks its heat. Because of its high wall temperature, it is only suitable for near-infrared heating.
Quartz tube features
1, high temperature
Quartz glass softening point temperature of about 1730 °C, can be used at 1100 °C for a long time, short-term maximum use temperature up to 1450 °C
2, corrosion resistance
In addition to hydrofluoric acid, quartz glass hardly reacts with other acids, and its acid resistance is 30 times that of ceramic, and 150 times that of stainless steel, especially at high temperatures. It is impossible for any other engineering material to work. Comparable.
3, good thermal stability
The coefficient of thermal expansion of quartz glass is extremely small and can withstand severe temperature changes. The quartz glass is heated to about 1100°C, and it will not burst when placed in normal-temperature water.
4, good light transmission performance
Quartz glass has good light transmission performance in the entire spectrum band from ultraviolet to infrared, visible light transmittance is above 93%, especially in the ultraviolet spectrum, the maximum transmission rate can reach more than 80.
5, good electrical insulation
The resistance value of quartz glass is equivalent to ten thousand times that of ordinary glass. It is an excellent electrical insulating material and has good electrical properties even at high temperatures.
The use of quartz tubes
1. The softening point of the quartz tube is 1270 degrees, and should not exceed 3 hours when used at 1200 degrees.
2. The tube furnace is not recommended to pass hydrogen gas under normal circumstances. Except for non-concentrated non-hydrogen content in the limit of the explosion concentration, if the customer needs to use the tube furnace to pass the hydrogen concentration outside the explosion concentration, safety measures must be taken. Do not stand on both ends of the furnace tube. If stainless steel is used, use a stainless steel tube. Since the thermal conductivity of stainless steel is larger than that of quartz, both ends of stainless steel need to be water-cooled. Otherwise, the temperature of the O-ring is too high to seal.
3, to maintain the cleanliness of the furnace tube, the furnace tube can not remain with the SiO2 reaction material, when burning materials, in order to make the furnace tube longer life, do not directly on the furnace tube material, with a boat type å©åŸš Sheng (as follows Pictured).
4. When heating, please put the ceramic plug in the furnace tube, otherwise the temperature at both ends of the tube is high, and the O-ring in the flange cannot withstand the higher temperature, making the airtightness not good, and putting the plug and the stove two The end is conducive to the formation of a balanced temperature field.
5. When heating, please make sure to put the alumina plug on the side of the furnace, put two on one side, a total of four, the distance between the two ends of the furnace plug can be about 450mm (because the length of the heating section of the HTL1200 split tube furnace is 400mm) If you do not put the furnace plug, the temperature at both ends of the furnace tube is high, and the O-ring in the flange cannot withstand the higher temperature, making the airtightness not good, and putting the furnace plug at both ends of the furnace tube is conducive to the formation of a balanced temperature. field.
6. The temperature resistance of quartz tube is related to its purity. The higher the purity, the higher the temperature resistance.
Editor's summary: The quartz tube heating principle and the characteristics of the quartz tube are introduced here, and we hope to help everyone. If you want to know more related information, you can pay attention to this website information.
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