Vacuum tube furnace

Time：2023-02-13

Precautions for use of high temperature vacuum tube furnace
Due to the large loss of vacuum tube furnace in use, we need to pay attention to many things when using it. Here is a brief introduction of several matters needing attention when using vacuum tube furnace.
1. After the vacuum tube furnace is used for the first time or for a long time, it should be baked for 1 hour at about 120 ℃ and used after being baked for 2 hours at about 300 ℃ to avoid furnace cracking. The furnace temperature shall not exceed the rated temperature as far as possible to avoid damage to heating elements and furnace lining. It is forbidden to directly pour various liquids and dissolved metals into the furnace to keep the furnace clean.
2. If the vacuum degree of the high-temperature vacuum tube furnace decreases after a period of use, the temperature-resistant silicone rubber ring between the stainless steel flanges can be replaced, the stainless steel flanges can be reinstalled, or the vacuum system can be replaced and repaired to improve the overall vacuum degree of the system.
3. When the cold furnace is used, because the furnace is cold and needs to absorb a large amount of heat, the heating rate of the low temperature section is not easy to be too fast, and the difference of the heating rate of each temperature section is not easy to be too large. When setting the heating rate, the physical and chemical properties of the sintered material should be fully considered to avoid the phenomenon of material spraying and contamination of the furnace tube.
4. If quartz tube is used in the furnace, when the temperature is higher than 1000 ℃, the high temperature part of the quartz tube will appear opaque, which is called devitrification (also called crystallization), which is an inherent defect of continuous melting quartz tube, and is a normal phenomenon.
5. Regularly check whether the electrical connection part of the temperature control system is in good contact, and pay special attention to whether the connection points of the heating elements are tight.

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