how to obtain high purity molybdenum powder

High purity molybdenum powder used for high voltage large current molybdenum wire of semiconductor devices, audio-visual equipment, camera parts and the target gate electrode material in high density of integrated circuit, etc. So how to obtain high purity molybdenum powder?

To the preparation of high purity molybdenum powder, you must first obtain the high pure molybdenum trioxide or high purity halide. To obtain high pure molybdenum trioxide process are:

Plasma physical vapor deposition method

With common air plasma treatment of molybdenum trioxide, molybdenum trioxide boiling point than most of the characteristics of low impurity, make its in air plasma flame volatilizes quickly, and bring a lot of cold air outside the plasma flame make gaseous molybdenum trioxide chilling, ultra pure molybdenum trioxide powders.

Ion exchange method,

Powder materials will be dissolved in polytetrafluoroethylene container water mixing, and then to the container at a speed of 1 L/h with concentration of 30% H2O2. The solution obtained by H cation exchanger, the solution is heated to 95 ℃ in the container, the suction pressure at about 25 Pa keep 5 hours, forming a precipitate after enrichment, is the high pure molybdenum trioxide.

Chemical purification method

Through recrystallization for many times, to obtain high purity ammonium molybdate, high pure molybdenum trioxide and calcination.

After winning high pure molybdenum trioxide, the traditional hydrogen reduction method and the plasma hydrogen reduction method can obtain high purity molybdenum powder. This several kinds of preparation technology are application, but the specific technical ideas and details are not public.

To obtain high purity halide process principle is: will industrial waste molybdenum oxide or molybdenum metal (such as sintered bar clamp scrap and waste molybdenum wire, molybdenum materials, etc.) get halide halide (generally for molybdenum pentachloride), and then under the condition of the high temperature of 550 ℃ or so fractionation of halogenated molybdenum processing, make the volatile impurities, get deep purification of halogenated molybdenum (allegedly purity can reach 5 N), at last, by hydrogen chloride hydrogen flame or plasma flame reduction, get high purity molybdenum powder.