Molybdenum News Center

Molybdenum Glass Melting Electrode Impurities and Density Affected Glass Quality

Molybdenum glass melting electrode has good high temperature property, electrical conductivity property and corrosion resistance property, commonly used in the glass furnace for a variety of glass manufacturing. The impurities and density of molybdenum electrode are important indicators of the electrode quality, but also have a certain impact on the quality of the glass.

The impurities of molybdenum electrodes including iron, nickel, cobalt and its compound is the main reason of glass coloring. If iron content is more than 150PPM, the glass will has obvious sense of green. If the glass heat preservation 48 hours, so the glass color is green. In addition, iron and nickel will also affect electrode’s life. Iron and nickel in molybdenum electrodes mostly exists by single or multiple metal compounds, due to their melting point much lower than the melting point of molybdenum and glass, so they will melt into the glass at the high temperature, making glass molybdenum electrodes early erosion, resulting electrode breakage during operation, reducing the life of the electrode and affecting glass transparency and furnace service life.

Molybdenum electrode density not only affects glass electrode life, but also affects glass quality. Molybdenum electrode having low density will make glass to produce tiny bubbles. Electrode density distribution mainly refers to the radial distribution and the central portion density is smaller than other sides, but the difference should less than 2-5%. The large difference will make electrode early erosion, resulting in a large number of molybdenum particles mixed with glass and affecting glass transparency. Longitudinal density uneven will cause slight DC potentiometer, so that the glass will produce tiny bubbles in glass, which is not conducive to produce high-quality optical glass.

Therefore, in order to expand electrode’s application field and obtain high performance glass should strictly control molybdenum electrode’s density and impurity content.

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