High Melting Point: Must be significantly higher than the operating temperature of the glass.
Excellent Electrical Conductivity: Ensures efficient electrothermal conversion.
Strong Resistance to Glass Melt Corrosion: Must not dissolve rapidly into the glass at high temperatures, as this would affect glass quality and electrode service life.
High-Temperature Strength: Maintains structural integrity at the operating temperature.
Minimal Glass Contamination: Oxides or dissolved substances from the electrode material must not cause unacceptable discoloration or defects in the glass.
Molybdenum electrodes are the most widely used electrodes for glass melting internationally.
Characteristics of Molybdenum
High Melting Point: 2622°C, significantly higher than the glass melting temperature.
Good Electrical Conductivity: Low electrical resistivity, leading to high heating efficiency.
Excellent Corrosion Resistance: Under reducing atmospheres, molybdenum exhibits excellent resistance to corrosion by most silicate glass melts.
High-Temperature Strength: Maintains good mechanical strength at temperatures below 1600°C.
Relative Affordability: Much lower cost compared to precious metals such as platinum and rhodium.
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