Purple Tungsten Oxide Preparation
Purple tungsten oxide is a kind of tungsten oxide product developed in China in recent years. Its phase composition is WO 2.72 or W 18 O 49 . Because of its unique properties, purple tungsten oxide is the main raw material of ultrafine tungsten powder and nanometer tungsten powder. The production of purple tungsten oxide is mainly made up of APT hydrogen reduction process. It is carried out in a multi tube furnace. There are two ways of flow direction of hydrogen in the furnace tube, one is that the direction of hydrogen flow is opposite to the direction in which the boat (material) is pushed in the furnace tube. This is the traditional method of hydrogen production by the medium and fine particle tungsten powder, which is called the reverse hydrogen reduction process. But later research found, such as changing the direction of hydrogen, the hydrogen flow direction and the boat forward in the same direction, can prevent spontaneous combustion of tung...