The secret of mirror 2-vacuum evaporation

As a necessity in our daily life, mirror is used for dressing up.After the continuous renewal of history, it has evolved from the natural mirror to the metal mirror and then to the glass mirror.Glass mirror is also divided into silver mirror, copper mirror and aluminum mirror due to different back coating.There are two surface processing methods of glass forming reflective imaging surface: electroless silver plating and vacuum evaporation. Today, let us talk about Vacuum evaporation:
The glass is washed and placed in a 0.1-10 PA vacuum evaporation device. The spiral tungsten wire is electrified.The high temperature produced makes the aluminum alloy in the spiral evaporate into gaseous state and deposit on the glass surface to form a mirror.Electron gun can also be used for heating instead of tungsten wire.The smooth metal surface can also be processed into mirror by vacuum evaporation.