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        silicon carbide rods

        Precautions for the use and maintenance of silicon carbide rods

        1. Check the resistance (Ω) value marked on the cold end of the silicon carbide rod before installation and use. If the writing is unclear, it must be re-tested. The test method is the voltage measured when the silicon carbide rod is energized and heated to a high temperature of 1050°C , Current, resistance calculated by Ohm’s law, the test principle is shown in the figure below.

        2. When silicon carbide rods are used, each group of rods should be matched with high temperature resistance. The allowable difference in electrical resistance is: ≥φ12mm rod with resistance, tolerance of resistance value ≤0.2Ω, ≤φ8mm rod with resistance, resistance value The tolerance is ≤0.5Ω.

        3. After the rod passes through the rod holes on both sides (or up and down) of the furnace wall, it should be freely rotated 360 degrees to prevent forced installation and knocking. Before the rod is installed, it can be installed with an iron pipe of the rod diameter.

        4. The use of silicon carbide rods must be equipped with voltage regulator or thyristor voltage regulator and voltage, ammeter and temperature automatic control instruments. During use, the resistance of the rod will gradually increase due to oxidation of the rod. In order to keep the furnace temperature normal, the operating voltage should be increased. When the voltage is increased to the maximum limit of the voltage transformer used and still cannot meet the requirements, the furnace can be stopped to change the wiring method of the rod and continue to use .

        5. When the new furnace starts to transmit power, in order to prevent the rod from breaking, use 1/2 of the rated power of the electric furnace for a period of time, and then gradually increase the voltage after everything is normal. The temperature should be raised according to the temperature of the electric furnace to avoid excessive power. Broken silicon carbide rod.

        6. For new furnaces or electric furnaces (kilns) that have not been used for a long time, the furnaces (kilns) must be baked before use, and old rods or other heat sources should be used as much as possible when baking the furnaces (kilns).

        7. It is strictly forbidden to use the silicon carbide rod with overload. If the rod is broken for some reason or the rod is found to be unevenly heated, and the part is incandescent or dark red for a period of time, it means that the rod body is inconsistent in aging, and the resistance of the section is too different. It is best to replace all the new rods for maintenance and replacement. For example, when replacing some new rods or single rods, the resistance of the new rods and the used rods are not matched properly, resulting in unbalanced load and uneven furnace temperature. Due to the large resistance difference, the rod temperature is also correlated, which will seriously affect the service life.

        8. If moisture is discharged during the heating process when the device or material plant is fired, the resistance furnace (kiln) used should be provided with exhaust holes to remove the moisture or other exhaust gas in the furnace (kiln) so as not to affect the rod Service life.

        9. The storage process of the stick should be protected from moisture. If the aluminum sprayed on the rod end is found to be deliquescence, the aluminum can be sprayed again after surface treatment. If there is no aluminum spray condition, you can wrap several layers of aluminum foil on the rod spray aluminum section.

        10. The silicon carbide rod is hard and brittle, so be careful when transporting, unpacking, installing and replacing. Handle with care, handle with care, and prevent mechanical knocks to avoid breaking the rod.

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