1. The silicon carbide rod is hard and brittle, and is easily broken by severe vibration and impact. Therefore, be extra careful when transporting, and handle it with care.
2. 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.
3. 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 extending out of the furnace wall. Generally, the extension length of the cold end is 50-150mm, so as to cool the cold end and connect the fixture.
4. 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 filler in the hole is too tight, the high temperature will hinder the free expansion of the silicon carbide rod and cause the rod to break. . When installed, the silicon carbide rod should be able to rotate freely 360 degrees.
5. The distance between the silicon carbide rod and the object to be heated 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.
6. The cold end of the silicon carbon rod is connected to the main circuit with aluminum braid or aluminum foil. The clamps on the cold end should be clamped tightly.
7. 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 source ovens should be used.
8. The silicon carbide rod should be protected from moisture when stored. Because the aluminum layer of the cold end is easy to decompose and fall off after being wet, the contact resistance between the cold end and the fixture increases, and the silicon carbide rod is easy to crack after being energized.
9. The silicon carbide rod should be resisted before use. First, the silicon carbide rods with the same or close resistance value are connected together.
10. Equipped with pressure regulating device for silicon carbide rod. The initial voltage of power transmission is half of its normal working voltage, and the voltage is gradually increased after a period of stability. In this way, the silicon carbide rod will not break due to rapid heating.
11. The continuous service life of the silicon carbide rod is long; the intermittent service life is short.
12. Reasonable surface load density and operating temperature should be selected when silicon carbide rods are used. The use temperature should not be greater than 1650 ℃; when used in a harmful gas environment, it is necessary to prevent the chemical reaction between the silicon carbide rod and the harmful gas.
13. When replacing the silicon carbide rods, the silicon carbide rods whose resistance is similar to that of the silicon carbide rods running in the furnace should be selected. If necessary, the silicon carbide rods of the whole furnace should be replaced, which is beneficial to improve the service life of the silicon carbide rods. The silicon carbide rod, if the resistance value is appropriate, can also be replaced in the middle and late operation of the electric furnace.
14. Prevent the silicon carbide rod from splashing molten metal, which can easily lead to broken rods.
15. Prevent alkali, alkaline earth metals and alkaline oxides from corroding silicon carbide rods.
16. Always observe whether the readings of the 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.