Heating principle of vacuum furnace

The heating principle of a vacuum furnace involves converting electrical or other energy sources into heat energy through heating elements within the furnace, and then transferring this heat to the workpiece in a high-vacuum environment. Due to the low pressure and sparse air molecules inside the furnace, heat is primarily transferred through radiation, with the workpiece surface absorbing this radiant heat and heating up.

Heating elements typically employ resistance wires, silicon carbide rods, or silicon molybdenum rods. When energized, these elements generate high temperatures, directly radiating heat to the furnace chamber and the workpiece. In high-temperature processes, the furnace body and chamber materials create a stable thermal field, ensuring uniform temperature distribution and consistent heating across the workpiece. Simultaneously, the vacuum furnace is equipped with a temperature control system that monitors the furnace temperature using thermocouples or infrared thermometers and automatically adjusts the heating power. The higher the vacuum level inside the furnace, the fewer gas molecules there are, reducing convection and conduction effects, and heat transfer primarily relies on radiation. Therefore, precise temperature control and heating efficiency are crucial for process quality.