Concept And Application Of 4N-5N High Purity Alumina

  High purity alumina is a white crystalline powder usually divided into three types :3N(99.9% purity), 4N(99.99% purity) and 5N(99.999% purity). High purity alumina has good sintering performance, dispersibility and porosity. 4N high purity alumina is mainly used in rare earth three-color phosphor and energy-saving lamps industry. 5N high-purity alumina is used in the manufacture of ceramic diaphragms, sapphire crystals, and lithium batteries. Sapphire crystal is an ideal substrate for leds due to its excellent stability, high mechanical strength, and easy cleaning. The need for energy saving standards has greatly increased the amount of sapphire, increasing the demand for high-purity 5N alumina

Sapphire glass is also used as the iPhone mobile phone camera, driving the application of sapphire glass in household appliances and consumer electronics. 5N high purity aluminum is also used in the field of lithium battery ceramic diaphragm. The coating of nano-alumina on the surface of lithium battery membrane can greatly improve the high temperature resistance and safety of lithium battery.

High purity alumina has good mechanical, thermal and chemical properties, and is widely used in microceramics, integrated circuits, rare earth phosphors, catalyst carriers and other fields