Silicon dioxide ( sio2 ) are promising anti - reflective films with good physical , chemical properties and good adhesion to sapphire . great progress has been made in the researches about sio2 anti - reflective and protective films overseas 氧化硅( sio _ 2 )膜具有优良的物理、化学性能,并且与蓝宝石附着良好,非常适合用作提高蓝宝石高温强度及增透涂层。