How to maintain well atmosphere furnace

In the process of using the well atmosphere furnace, we need to carry out the necessary maintenance regularly. The regular maintenance work is very good for the well atmosphere furnace itself. It can greatly extend the service life of the furnace and improve the working efficiency of the furnace. So how should we carry out the maintenance work of the well atmosphere furnace, What else do we need to pay attention to?

1. After purchasing a new well type atmosphere furnace or not in use for a long time, we need to bake it in 120 ℃ for one hour and 300 ℃ for two hours. The purpose of this is to prevent the furnace from cracking. For the selection of furnace temperature, we cannot exceed the rated temperature to prevent it from damaging the heating elements. We need to keep the well type atmosphere furnace clean at all times, It is forbidden to directly fill the furnace with various liquids and dissolved metals.

2. The well type atmosphere furnace shall be used under the atmosphere condition. The gas will expand under the high temperature, which will cause the pressure in the furnace to increase. This is that the user shall open the needle valve in time to remove the gas. Generally, the safety pressure in the pipe is generally set between - 0.05Mpa and 0.05Mpa.

3. If corundum furnace tube is used in the furnace of well type atmosphere furnace, according to the physical properties of corundum material, the rate of rise and fall of temperature in each temperature zone should not be too fast (≤ 5 ℃), it is forbidden to take and send materials above 100 ℃ of furnace tube, which is conducive to the uniform release of thermal stress of furnace tube, so as to prolong the service life of furnace tube. If the furnace adopts quartz tube, when the temperature is higher than 1000 ℃, the high temperature part of quartz tube will appear opaque phenomenon, which is called devitrification (also called devitrification), which is an inherent defect of continuous melting quartz tube, and it is a normal phenomenon.

4. In the process of using the cold furnace, because the temperature of the furnace is very low, a lot of heat absorption is needed. This is that the temperature rise rate of the even low temperature section is not easy to be too fast, and the temperature rise rate difference of each temperature section is not easy to be too large. When setting the temperature rise rate, the physical and chemical properties of the sintered materials should be fully considered to avoid the phenomenon of the occurrence of spraying materials and the pollution of the furnace tube.

5. After the well type atmosphere furnace is used for a period of time, the vacuum degree in the furnace will be reduced. This is that we can replace the temperature resistant silicon rubber ring between the stainless steel flange plates, reinstall the stainless steel flange plates or replace and repair the vacuum system to improve the overall vacuum degree of the system.