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Alumina ceramics

 
     
     
     
   

At present alumina ceramics is divided into two types: high-purity and ordinary. High-purity alumina ceramic series is the ceramic material with Al2O3 content over 99.9%. Due to its sintering temperature up to 1650-1990℃ and transmission wavelength of 1 ~ 6μm, it is usually made into molten glass to replace the platinum crucible: Employing its light transmittance and alkali metal corrosion resistance, it can be used as sodium tube; in the electronics industry, it can be used as integrated circuit substrate and high-frequency insulating materials. According to the difference in Al2O3 content, ordinary type alumina ceramic series is divided into 99 ceramics, 95 ceramics, 90 ceramics, 85 ceramics etc. Sometimes ceramics with Al2O3 content of 80% or 75% is also classified as ordinary alumina ceramic series. Among these, 99 alumina ceramic materials are used for producing high-temperature crucible, refractory furnace tubes and special wear-resistant materials such as ceramic bearings, ceramic seals and valve films and so on. 95 alumina ceramics is mainly used as corrosion-resistant and wear-resistant parts. 85 ceramics are often mixed in some steatites, thus improving electrical performance and mechanical strength. It can be sealed with molybdenum, niobium, tantalum and other metals and some are used as electro-vacuum devices.

 
 
 
 
         
   
 
     
     
     
       
 

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