Molybdenum News Center

Fused kiln development and the development and the development of suitable electrode materials have a great relationship. Requirements for the electrode material made ​​as follows: 

(1) without considering the oxygen partial pressure and the current load situation, can withstand a temperature of 1700 ℃. 

(2) at least will not be at 800 ℃ air oxidation. 

(3) having a conductivity corresponding to the metal. 

(4) having a sufficient mechanical strength below 1700 ℃. 

(5) has sufficient resistance to thermal shock. 

(6) with good wetting properties of molten glass. 

(7) does not contaminate the glass, structural stability in various media. 

(8) resistant glass liquid erosion, erosion and strong. 

(9) itself, containing few impurities, and the refractory is not functioning and long life. 

(10) low coefficient of expansion. 

(11) a low contact resistance and glass. 

(12) cheap, meets all the above requirements electrode material has yet to be found, and may never be found. 

 

Therefore, had to reduce the requirements, depending on the application and the technical and economic conditions exist in these applications, select different electrode materials. Study fused electrode material fused glass in the study process is a very important issue. Currently available electrode materials are graphite, platinum, tin oxide, molybdenum and iron. 

 

Development of glass fused to the current electrode has gone through several stages: 

① 1907 年 normal glass melting graphite electrodes. 

② 1925 annual use electrodes made ​​of metal iron melting color glass. 

③ 1932 annual electricity do molybdenum electrode material. 

④ 1964 years and the emergence of tin oxide electrode material. 

 

The most common material is pure molybdenum electrode, often made ​​of the diameter of the rod 30 ~ 100mm; tin oxide electrodes are ceramic materials, manufacturing difficulty, high cost, mainly for melting lead glass, or some special work pool in glass melting. The conductivity, the difference between tin oxide and molybdenum large current load is typically molybdenum 2A/cm2, tin oxide should not exceed the current load 0.3A/cm2. Generally through the use of water cooling the electrodes. Limited to the use of steel electrodes colored glass production, and this electrode melting current temporary special material called glass. Graphite glass because of pollution, has been largely eliminated, it is now rarely used. 

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