Operation and Precautions for Vacuum Atmosphere Furnaces

Vacuum atmosphere furnace is the vacuum can be pumped and can pass the atmosphere of the furnace, it has a box-type vacuum atmosphere furnace, tube-type vacuum atmosphere furnace, lift vacuum atmosphere furnace and many other different types of furnace. Although there are many types, in the operation of the precautions are similar, the following we will learn about.

1. We can not overload the use of a high-temperature vacuum atmosphere furnace. The maximum operating temperature of the high-temperature vacuum atmosphere furnace refers to the surface temperature of the component itself allowed in the vacuum, and not the temperature of the heating material or the temperature around the heating element. It should be noted that the temperature of the vacuum heating element itself is generally 100℃ higher than the temperature of the medium around it or the heated temperature.

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2. When measuring high-temperature vacuum atmosphere furnace temperature uniformity, we should pay attention to the positioning of the temperature measurement contacts, as well as the distance from the heating element. High-temperature vacuum atmosphere furnaces often use a brush, broom or compressed air, vacuum cleaner, etc. to clean the chamber, to prevent the furnace oxide and other impurities from falling on the electric heating element, a short circuit, and even burned molybdenum heating rod.

3. High-temperature vacuum atmosphere furnace heating up, we can not open the high-temperature vacuum atmosphere furnace door. Note that before filling the atmosphere, the vacuum gauge switch should be closed to prevent the vacuum gauge from aging. When the temperature is higher than 400℃, it must not be cooled sharply.

4. To avoid the heating element and product reaction, especially foot copper, aluminum, zinc, tin, lead, etc., and vacuum heating element contact, whether it is fine powder, molten liquid or steam, etc., to prevent erosion in the electric heating body surface to form a "pockmark", cross-section becomes smaller after overheating and burn off.

5. The bottom plate, molybdenum heating rod, furnace insulation, and other heat-resistant steel components every use for a period of time, should be cleaned, knocking is strictly prohibited, can be careful of its oxide skin. Iron oxide skin and other impurities such as not in time, will melt at the firing with the insulation layer so that the molybdenum wire will melt.

6. the Cooling system is an important part of the high-temperature vacuum atmosphere furnace. The cooling water circuit should be kept smooth, otherwise, the water temperature rises causing downtime. Biodegradation chemical auxiliary method to treat the cooling water, the purpose is to keep the minerals in suspension and reduce the rubber tube, serpentine tube, and water jacket in the accumulation of sediment, in order to make the water flow smoothly.

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7, After the system work stable, at least once a month should be a water quality test to prevent over treatment or under over treatment. High-temperature vacuum atmosphere furnace shell and heat exchanger material test samples should also be placed in the waterway system, once a year to do a weight loss test to check the effect of treatment. Special attention should be paid to the serpentine tube cooler of the diffusion pump. It should be checked frequently.

A vacuum atmosphere furnace is an ideal product for powder sintering, ceramic sintering, high-temperature experiments, and quality inspection in universities, research institutes, and industrial and mining enterprises.

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