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 )膜具有優良的物理、化學性能,并且與藍寶石附著良好,非常適合用作提高藍寶石高溫強度及增透涂層。