Precautions for installing silicon carbide stick
- The silicon carbide stick is hard and brittle, so it should be handled with care during transportation.
- The heating part of the silicon carbide rod cannot extend into the furnace wall, otherwise the furnace wall will be easily burnt.
- The length of the cold end of the silicon carbide rod shall be equal to the thickness of the furnace wall plus the length of the cold end protruding from the furnace wall. Generally, the extension length of the cold end is 50-150mm, so as to cool the cold end and the connecting fixture.
- The inner diameter of the furnace passing through the silicon carbide rod shall be 1.4-1.6 times of the outer diameter of the cold end. If the furnace hole is too small or the filler in the hole is too tight, the free expansion of the silicon carbide rod will be hindered at high temperature, resulting in rod breakage. During installation, the silicon carbide rod should be able to rotate 360 degrees freely.
- The distance between the silicon carbide rod and the object to be heated and the furnace wall shall be greater than or equal to 3 times the diameter of the heating part. The center distance between the silicon carbide rod and the silicon carbide rod shall not be less than 4 times the diameter of the heating part.
- The cold end of the silicon carbide rod is connected with the main circuit with aluminum braid or aluminum foil. Clamp the cold end.
- The new furnace or the electric furnace that has not been used for a long time shall be dried before use, and the old rod or other heat source shall be used.
- The silicon carbide stick shall be protected from moisture during storage. Because the aluminum layer at the cold end is easy to decompose and fall off after being affected with moisture, the contact resistance between the cold end and the fixture increases, and the silicon carbide rod is easy to crack after being energized.
- The resistance of silicon carbide rod shall be distributed before use. First, silicon carbide rods with the same or similar resistance are connected together.
- The silicon carbide rod is equipped with a voltage regulating device. At the initial stage of power transmission, the voltage is half of its normal working voltage, which will be gradually increased after a period of stability. In this way, the silicon carbide rod will not break due to sharp temperature rise.
- Long continuous service life of silicon carbide rod; Short intermittent service life.
- The reasonable surface load density and use temperature shall be selected when the silicon carbide rod is used. The service temperature shall not be greater than 1650 ℃; When using in hazardous gas environment, it is necessary to prevent the chemical reaction between silicon carbide rod and hazardous gas.
- When replacing the silicon carbide rod, the silicon carbide rod that is close to the resistance of the silicon carbide rod running in the furnace shall be selected. If necessary, the silicon carbide rod of the whole furnace shall be replaced, which is conducive to improving the service life of the silicon carbide rod. If the resistance value is appropriate, the silicon carbide rod that cannot be unloaded shall be used.
- Prevent the silicon carbide rod from splashing molten metal, which may easily lead to rod breakage.
- To prevent alkali, alkaline earth metal and alkaline oxide from corroding the silicon carbide rod, it can also be replaced in the middle and later period of electric furnace operation.
- Frequently observe whether the readings of ammeter, voltmeter and thermometer are normal; Whether the cold end clamp is loose, oxidized and blackened or ignited; Whether the silicon carbide rod is broken; Whether the red heat of the heating part of the silicon carbide rod is uniform.
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