tubular furnaces use and maintenance

The quartz tube must be used and maintained during the use of tubular furnace

Because of its unique structure, tubular furnace tube is an important key component, as well as a reaction site and working area in the process of production and test. And the furnace tube is directly related to the gas, pressure and operation method. Therefore, it is necessary to pay attention to the use and maintenance of quartz tube during the use of tubular furnace:

1. The softening point of the quartz tube is 1270 degrees. When used at 1200 degrees, it should not exceed 3 hours.

2. tube furnace usually don't recommend customer hydrogen, except through the concentration of hydrogen content in explosion limit, if the customer need to use tubular furnace concentration in concentration of hydrogen gas explosion, must do a good job in security measures, the general gas when people don't stand on both ends of the furnace tube, if hydrogen use stainless steel tube, due to the heat transfer coefficient is larger than quartz stainless steel, stainless steel ends need water cooling, otherwise unable to seal o-rings temperature is exorbitant,

3. Keep the furnace tube clean and sanitary, and no substances reacting with SiO2 shall be left in the furnace tube. When burning materials, in order to extend the service life of the furnace tube, do not put the materials directly on the furnace tube and hold them with a boat crucible (as shown in the figure below).

4. please be sure to put ceramic furnace plug in the furnace tube when heating, otherwise the temperature at both ends of the furnace tube is high, the O-ring in the flange can not bear high temperature, so that the air tightness is not good, put the furnace plug and the furnace at both ends is conducive to the formation of a balanced temperature field.

5. please be sure to put the alumina furnace heating furnace tube plug, put two side, a total of four, on both sides of the furnace can plug en croute distance around 450 mm (for HTL1200 open tubular furnace heating length is 400 mm, if you don't put out plug, on both ends of the furnace tube temperature is higher, the o-rings in the flange can't bear high temperature, makes the air tightness is not good, put out plug on both ends of the furnace tube is helpful to form 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.