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Production Technology of Purple Tungsten oxide

The first step in powder metallurgy is to make metal powder. The powder preparation process is mainly divided into four steps: solid-state reduction, atomization, electrolysis, and chemical methods. Solid reduction in the powder reduction process, the selected ore crushing, mixed reduction (such as carbon), to the continuous furnace. Reaction occurs in the furnace, leaving the sheet metal, then crushed, separated from all non-metallic materials, screened, and produced powders. In the absence of refining, the purity of the powder depends on the raw material. Irregular woolen particles, soft, compressible, good pre-sintered ("green") strength. In this process, the molten metal is divided into small droplets and frozen quickly before contact with each other or with the solid. In general, the flow of molten metal film is decomposed by the influence of high energy jet of gas or liquid. In principle, this technique applies to all molten metals and is used for commercial production of metal iron, copper, alloy steel, brass, bronze, low melting point metals such as aluminium, tin, lead, zinc, cadmium, and, in selected cases, tungsten, titanium, rhenium, And other high melting point materials. Electrolysis by selecting suitable conditions such as electrolyte composition and concentration, temperature and current density, many metals can be stored in a woolly or powdery state. Further treatment, washing, drying, reduction, annealing, crushing, are often necessary to produce high purity, high density powders. Copper is the raw metal for electrolysis, but iron, chromium and magnesium powder can also be used in this way. Because of its high energy cost, electrolysis is generally limited to high value powder, such as high conductivity copper powder. The most common chemical powder treatment involves redox, precipitation, and thermal decomposition from the solution. The properties of the produced powders vary greatly, but the size and shape of the powders are similar. Redox powders tend to be "spongy" because there are many pores on the particles. The particle size distribution of the solution precipitated powder is narrow and the purity is high. Thermal decomposition is the most commonly used to treat metal carbonyl complexes. These powders, once ground and annealed, have a purity of more than 99.5 per cent.