Producing Purple Tungsten Oxide

How metal powder made of?
The first step is the manufacture of metal powder metallurgy. Powder production process consists of four steps: a solid-state reduction, atomization, electrolysis, and chemical methods. Solid state reduction
Reduction in solid powder reduction process, the selected ore crushing, mixing reducing substances (eg: carbon), transferred to the continuous furnace. All non-metallic materials and separation, screening, production of powder in the reaction furnace, leaving spongiform metal, then pulverized. Since there is no refining treatment, depending on the purity of the powder material. Irregular spongy particles, soft, easy compression, a good pre-sintered ("green") strength.

Atomization
In this process, the molten metal into small droplets and rapidly frozen before contact with each other or with a solid contact. Typically, the film flow of molten metal by gas or liquid high energy impact jets and decomposition. In principle, this technique is applicable to all metals can be melted and used for commercial production of metallic iron, copper, steel, brass, bronze, low-melting-point metals, such as aluminum, tin, lead, zinc, cadmium, as well as in selected case, tungsten, titanium, rhenium, and other high melting point materials.

Electrolysis
By selecting appropriate conditions, such as the electrolyte composition and concentration, temperature and current density, many metals can be cotton or powder state storage. Further processing, washing, drying, reduction, annealing, broken, is often required, ultimately produce a high purity, high density of the powder. Electrolytic copper is a metal raw material, but the iron, chromium, magnesium powder produced in this way can also be used. Due to its associated high energy costs, the electrolysis is generally limited to high-value powders such as high conductivity copper.

Chemical Methods
The most common process involves a redox chemical powder from the solution, precipitation, thermal decomposition. The performance of the powder produced a great change, but the powder particle size and shape basically similar. Redox powder tends to "sponge" shape, because there are many pores on the particle. The precipitated powder solution narrow particle size distribution, a high purity. Thermal decomposition is the most commonly used for treatment of metal carbonyls. These powders, after a grinding and annealing, a purity of over 99.5%.

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