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        The main factors affecting the service life of silicon carbid

        ① Operating
          temperature    The higher the temperature of the silicon carbide rod, the shorter the life. Especially when the furnace temperature exceeds 1600°C, the oxidation speed will increase and the service life of the silicon carbide rod will be shortened. Therefore, please try not to make the surface temperature of the silicon carbide rod too high, that is, it is necessary to reduce the difference between the furnace temperature and the temperature of the silicon carbide rod.
         
        ②Surface load
          Surface load density refers to the rated power allowed per unit surface area of the heating part of the rod.
          Surface load density = rated power (W) / surface area of the heating part (cm2)
          Practice has proved that the larger the load density, the difference between the surface temperature of the heating element and the furnace temperature is also large. The higher the load density, the higher the surface temperature of the rod body, the faster the resistance growth, and the shorter the life of the SIC rod. Therefore, the surface temperature load density of the silicon carbide rod, the atmosphere in the furnace, and the temperature are directly proportional to the aging rate of the SIC rod, and inversely proportional to the life of the SIC rod.

        The relationship between furnace temperature and surface load density The
                        
        use range curve shown in the figure is the critical line of surface load density. In actual conditions, please keep the surface load at 1/2-1/3 of the critical line.
         
        ③ The atmosphere
          in the furnace will react between the silicon carbide rods and many chemical substances volatilized from the fired materials during firing. If it reacts with gases such as water, hydrogen, nitrogen, sulfur, halogen, and molten aluminum, alkali, salt, etc. When molten metal and metal oxide come into contact, reaction, corrosion or oxidation will also occur.
         
        ④ Kiln operation mode
          Silicon carbide rods have a longer life in continuous kilns and batch kilns. The surface of the silicon carbide rod is oxidized to form a silicon dioxide film during use. Long-term use will increase the silicon dioxide film and the resistance of the silicon carbide rod. The silicon dioxide film expands and contracts abnormally near the crystallization critical point (270°C). Because the temperature always fluctuates at this temperature during intermittent use in intermittent kilns, the silica film is repeatedly broken to accelerate oxidation. Therefore, when the furnace temperature drops to room temperature, the resistance often increases sharply.
         
        ⑤ Wiring method
          If the resistance values of the silicon carbide rods are different, the high-resistance silicon carbide rods will be more concentrated when connected in series, which will easily cause the resistance of a certain silicon carbide rod to increase rapidly and shorten its life. Silicon carbide rods are generally used in combination with series and parallel connections. It is recommended to use 2 in series to form a group and then multiple groups in parallel. Especially when the furnace temperature exceeds 1350℃, it must be connected in parallel. It is recommended to use open delta wiring for three-phase wiring.
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