Graphite rods are often used in high-temperature vacuum furnaces as electric heating bodies, which are beneficial to make products easily oxidized at high temperatures, so that suitable products can be produced more easily. Why are graphite rods so popular in the market? Mainly because of its high cost performance.

The thermal conductivity and electrical conductivity of graphite rods are very high. For example, the thermal conductivity is different from that of ordinary metal materials. It is greater than iron, lead, steel and other metal materials, and the thermal conductivity decreases as the temperature increases. The conductivity of graphite carbon rod is 4 times higher than that of stainless steel and 2 times higher than that of carbon steel.

1. Good uniformity

When we use the vacuum furnace as an electric heater, the red heat uniformity of the heating part needs to be selected, because it will affect the temperature distribution and service life in the furnace. If the graphite carbon rod is in use, the red heat uniformity becomes poor, which will cause the fracture of the graphite rod.


2. Surface temperature

Due to the nature of the graphite rod itself, the higher the temperature, the shorter the service life. It can be seen that if the surface temperature of the graphite carbon rod exceeds a certain temperature, the oxidation rate will increase and the service life will be shortened. Therefore, when we use it, we recommend that you do not make the surface temperature too high.

3. Leave enough voltage adjustment margin

When the graphite carbon rod is heated in the air, a kind of anti-oxidation protective film will be formed on its surface. Next, when we use it intermittently, we need to ensure that the temperature in the vacuum furnace is stable, so that when we use a new graphite rod, the resistance of the graphite rod will increase at a lower voltage.

Fourth, the later voltage

When using a variety of graphite rods, the voltage required later will be higher than the voltage of the new rod. Therefore, we need to pay attention to the voltage in the later stage, and adjust it according to the voltage regulation method or wiring method. Generally speaking, the upper limit of the voltage in the later stage will also have a certain calculated value.