(1) The cold end of the silicon carbide rod is connected to the main circuit with aluminum braid or aluminum foil. The clamp at the cold end must be clamped tightly.
(2) The silicon carbide rod has a long continuous service life; the intermittent service life is short.
(3) Prevent the molten metal from splashing on the silicon carbide rod. Splashing on the molten metal will easily cause the rod to break.
(4) Prevent the corrosion of silicon carbide rods by alkali, alkaline earth metals and alkaline oxides.
(5) The silicon carbide rod should be matched with resistance before use. First connect silicon carbide rods with the same or close resistance values together.
(6) Newly built furnaces or electric furnaces that have not been used for a long time should be baked before use, and old rods or other heat sources should be used.
(7) The length of the heating part of the silicon carbide rod should be equal to the width of the furnace. If the heating part extends into the furnace wall, it is easy to burn the furnace wall.
(8) The length of the cold end of the silicon carbide rod should be equal to the thickness of the furnace wall plus the length of the cold end protruding from the furnace wall. Generally, the extended length of the cold end is 50-150mm to cool the cold end and the connecting fixture.
(9) The inner diameter of the furnace through the silicon carbide rod should be 1.4 to 1.6 times the outer diameter of the cold end. If the furnace hole is too small or the filling in the hole is too tight, it will hinder the free expansion and contraction of the silicon carbide rod at high temperature and cause breakage. Baton. During installation, the silicon carbide rod should be able to rotate 360 degrees freely.
(10) The silicon carbide rod is hard and brittle, and it is easy to break when subjected to severe vibration and impact. Therefore, be extra careful when transporting, and handle with care when transporting.
(11) The silicon carbide rods should be protected from moisture when they are stored. Because it is easy to decompose and fall off the aluminum layer of the cold end after being exposed to moisture, the contact resistance between the cold end and the fixture is increased, and the silicon carbide rod is prone to cracking after being energized.
(12) The distance between the silicon carbide rod and the heated object and the furnace wall should 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 should not be less than 4 times the diameter of the heating part.
(13) Equipped with a pressure regulating device for silicon carbide rods. The initial voltage of power transmission is half of the normal working voltage. After a period of stability, the voltage will be gradually increased. In this way, the silicon carbide rod will not be broken due to the rapid temperature rise.
(14) When replacing silicon carbide rods, you should choose silicon carbide rods that are close to the resistance of the silicon carbide rods running in the furnace. If necessary, replace the entire furnace silicon carbide rods. This will help increase the service life of the silicon carbide rods. The silicon carbide rods that come, if the resistance value is appropriate, can also be replaced in the middle and late stages of the operation of the electric furnace.
(15) Frequently observe whether the readings of the ammeter, voltmeter and thermometer are normal; whether the clamps at the cold end are loose, oxidized and blacked or sparked; whether the silicon carbide rod is broken; whether the heating part of the silicon carbide rod is uniformly red and hot.
(16) When using silicon carbide rods, choose a reasonable surface load density and operating temperature. The operating temperature should not be greater than 1650℃; when used in a hazardous gas environment, it is necessary to prevent the silicon carbide rod from chemically reacting with the hazardous gas.
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