Preparation Of High Purity Molybdenum Powder
- Details
- Category: Molybdenum knowledge
- Published on 14 August 2014
- Written by ling
- Hits: 523
High-purity molybdenum powder molybdenum wire for high voltage high current semiconductor devices, audio-visual equipment, camera parts and high-density integrated circuits, such as the gate electrode target. To high-purity molybdenum powder preparation, must first obtain high purity molybdenum trioxide or high purity halides. The process to obtain high-purity molybdenum trioxide are:
Plasma physical vapor deposition method
Air plasma treatment ordinary molybdenum trioxide, molybdenum trioxide using low boiling point than most impurity characteristics, make it evaporate quickly in air plasma flame, and then introduced into the plasma flame outside a lot of cold air chilled gaseous molybdenum trioxide, obtain ultra-pure molybdenum trioxide powder.
Ion exchange method
The raw material powder was dissolved in water was added with stirring a polytetrafluoroethylene container, and then 1 L / h was added to the vessel speed of 30% of the concentration of H2O2. The resulting solution was passed through the H-type cation exchanger, the vessel was heated to 95 ℃, the suction pressure was maintained at about 25 Pa 5 hours to form a precipitate, that is, high-purity molybdenum trioxide and concentrated.
Chemical purification method
By repeated recrystallization, to obtain high purity ammonium molybdate, molybdenum trioxide and then calcined to obtain high purity.
After obtaining high purity molybdenum trioxide, hydrogen reduction method using traditional and plasma hydrogen reduction method can obtain high-purity molybdenum powder. These types of applications, preparation techniques have been reported, but the specific technical ideas and details were not made public.
Obtain high-purity halide process principle is: the industrial molybdenum trioxide or molybdenum metal scrap (such as vertical melting of the chuck, molybdenum metal scrap, waste molybdenum wire, etc.) halogenated get halide (usually molybdenum pentachloride), and then under a high temperature condition of about 550 ℃ molybdenum halides fractionated treatment, the inside of the volatile impurities, is purified to obtain the depth of the molybdenum halides (allegedly achieve purity 5 N), and finally through the hydrogen flame a chlorine or hydrogen reduction of the plasma flame to give high purity molybdenum powder.
More molybdenum product: http://www.molybdenum.com.cn
Tel: 0592-5129696 Fax：0592-5129797
E-mail:
This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Tungsten News & Tungsten Price: http://www.chinatungsten.com
sales@chinatungsten.com