Equal-diameter silicon carbide rods for sintering furnaces of magnetic materials

New furnaces or electric furnaces that have not been used for a long time must be baked before use. During baking, it is advisable to use old rods or other heat sources as much as possible. After the silicon carbide rods pass through the rod holes on both sides of the furnace wall, they should be able to rotate freely 360°. Forced installation and knocking must be strictly avoided. Before installing the rods, test installation can be done using an iron pipe with the same diameter as the rod ends. Silicon carbide rods are hard and brittle, so special care must be taken during transportation, unpacking, installation, and replacement. Handle with care, avoid mechanical impact to prevent rod breakage.

When initially powering a new furnace, to avoid rod breakage, the voltage should be increased gradually. It is generally appropriate to start at half the rated voltage, and only after everything is normal should the voltage be gradually increased. During the heating process, water vapor is released, so the resistance furnace must have exhaust vents to expel water vapor or other harmful gases from the kiln, thereby avoiding impact on the service life of the rods.

During storage, the rods must be protected from moisture. If the aluminum-sprayed ends are found to have deteriorated or deliquesced, they can be re-sprayed with aluminum after surface treatment. If aluminum spraying is not feasible, wrap several layers of aluminum foil around the aluminum-sprayed section before use. Overloading of silicon carbide rods is strictly prohibited. If a rod breaks or shows uneven heating, with sections appearing incandescent or dull red, this indicates inconsistent aging of the rod, with significant resistance differences between sections. The furnace should be shut down for maintenance and rod replacement.

Silicon carbide rod furnaces must be equipped with voltage-regulating transformers or silicon-controlled voltage regulators, as well as voltage, ammeters, and automatic temperature control instruments. During use, as the rods oxidize and their resistance gradually increases, the voltage must be raised to maintain normal furnace temperature. When the voltage reaches the limit of the transformer and still cannot meet requirements, the furnace should be shut down, and the rod wiring method should be changed before continuing use.