Vacuum tube furnaces have a lot of losses due to their use, so there are many places to pay attention to when using them. Here are a few simple things to note when using vacuum tube furnaces.
1. After the furnace is used for the first time or after a long time of use, it should be baked at 120 °C for 1 hour and baked at 300 °C for 2 hours to avoid cracking of the furnace. The furnace temperature should not exceed the rated temperature as much as possible to avoid damage to the heating element and the lining. It is forbidden to directly inject various liquids and dissolve metals into the furnace to keep the furnace clean.
2. After the furnace has been used for a period of time, if the vacuum is reduced, replace the temperature resistant silicone ring between the stainless steel flanges or reinstall the stainless steel flange or replace the vacuum system to improve the overall vacuum of the system.
3. When the furnace is used, since the furnace is cold, it must absorb a lot of heat, so the heating rate in the low temperature section is not too fast, and the difference in heating rate of each temperature section is not too large. The temperature of the sintered material should be fully considered when setting the heating rate. Chemical properties, so as to avoid the phenomenon of spraying and contaminating the furnace tube.
4. If the furnace is made of quartz tube, when the temperature is higher than 1000 °C, the high temperature part of the quartz tube will appear opaque. This is called devitrification (also called devitrification). It is an inherent defect of the fused quartz tube, which is a normal phenomenon. .
5. Regularly check whether the contact of the electrical connection part of the temperature control system is good. Pay special attention to whether the connection of each connection point of the heating element is tight.
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