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Molybdenum Electrode Structure

Due to different glass furnace type and different production requirements, molybdenum electrode structure includes plate electrode, rod electrode and ball electrode these three structures. In actual application, theses three structure molybdenum electrodes can be designed as continuous feed type or long life type. Continuous feed type electrode during furnace operation will continue be consumed, in order to ensure the normal operation, so the electrode should intermittently be pushed into furnace. The long-life type molybdenum electrode required during operation should not substantially be consumed, so the electrode life is the life of the furnace.

Molybdenum electrode has plate-shaped, rod-shaped and ball-shaped three structures, but these three structures have same installation method in glass furnace. Figure 2.2.6 is installation instruction and the electrode across the four regions. A area is electrode and in the furnace covered with molten glass. B area includes electrode, molten glass and air, which is triple-phase boundary. C area is heat affected zone (HAZ). D area is low temperature zone. In the three-phase boundary, the temperature is close to the temperature of the molten glass, but by the combined effect of the media and the air the electrode is easily oxidized at high temperature, so in this area corrosion is most severe. According to the molybdenum oxide kinetics analysis, the temperature in the three-phase boundary and HZA zone is higher than molybdenum oxidation temperature, so the electrode should cover with reliable oxidation resistance measures. HAZ affected by heat conduction effect, the temperature can reach 800 ℃ ~ 1000 ℃ and in the low temperature zone due to cooling effect, the temperature can reduce to 150 ℃ ~ 200 ℃.

Analyzed oxidative cleavage molybdenum electrode found that the fracture position often in the front of HZA where close to the vicinity of the three-phase boundary, and there has many MoO₃ powder. To prevent heat affected zone and three-phase boundary oxidation has two methods, which is to reduce these two areas temperature below than the temperature of molybdenum oxide, or completely cut off the air.

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