Explanation
There are eight known crystal structures of alumina, and the commonly used crystal growth methods are: pulling method, guided mode method, bubbling method, heat exchange method and guided temperature gradient method. A-Al203 single crystal has a Mohs hardness of 9 (second only to diamond). In addition, it also has high strength, high thermal conductivity, high thermal shock resistance quality factor, corrosion resistance and other properties, making it widely used in infrared window, fairing, substrate and substrate, optical lens, detection window and other fields
Classification
Inorganic non-metallic materials -> Crystal growth and crystal materials