Vapor phase method producing yellow tungsten oxide is using oxidant reaction between tungsten and oxygen to produce yellow tungsten oxide. Control evaporating system pressure under 133.3~1199.9P, heating tungsten wire to let tungsten and oxygen react in the air, nano yellow tungsten oxide is obtained.
Vapor phase method is by using gas or turning article into gas, it will have physical or chemical reaction under gas status. Then it will form into micro particle or nano micro particle powder in the cooling process. Powder with small grain size can be obtained under this method, it is suitable for yellow tungsten oxide with special required property. But it has high requirement for equipment and big investment, the reacting process is hard to control.