The molybdenum has been the best material of electrode for melting high-grade optical glass, glass fiber and refractory rock wool for many years thanks to its advantages of high melting point (2620℃), good conductivity and thermal conductivity, small expansion coefficient, high temperature strength and good resistance to glass corrosion.
However, molybdenum is easy to oxide in oxidizing atmosphere at high temperature, and it will be lost due to the intergranular corrosion of glass liquid on electrode surface. Therefore, it is a common concern to improve the quality and performance of molybdenum glass melting electrodes (GME).
1. Production technology control of moly electrode
Ammonium molybdate is heated to obtain molybdenum trioxide; moly trioxide is reduced to molybdenum powder by hydrogen heating; molybdenum powder to form bank electrode in molds under isostatic pressing equipment; the blank electrode to be sintered, forged and machined into finished products.
2. Control of impurity content
The production of moly electrode requires high-quality molybdenum powder. Impurities will cause cracks or hidden cracks of electrode; C and N contents will cause bubbles in the glass liquid, which will affect the quality of finished glass; metal elements such as Ti, Ni, Cu, CD will make the glass colored.
3. Control of molybdenum powder particle size
It is concluded that the molybdenum powder with medium particles and close to normal distribution is the best material for producing high-quality molybdenum electrode products, according to the production experience and data analysis.
4. Sintering of moly electrode
In order to reduce the temperature difference between inside and outside of blank molybdenum electrode, slow and smooth temperature rise and stage heat preservation system are adopted to prevent hidden cracks caused by excessive thermal stress. Appropriate holding temperature and holding time can ensure fine and uniform grain structure.
5. Forging of moly electrode
Adopting appropriate forging process, especially appropriate forging temperature, final forging temperature, deformation and deformation.
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