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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Purple tungsten oxide (Violet Tungsten Oxide, VTO), referred to as purple tungsten. Purple tungsten oxide refers to paratungstate (Ammonium Paratungstate, APT) as raw material was calcined under certain conditions, decomposition, reduction generated purple tungsten oxide. General purple or blue-purple crystalline powder. By strong fissile octahedral structure, intrinsic crystalline needle and rod. Purple Tungsten is a tungsten oxide, the chemical formula for WO2.72 or W18O49. Purple and yellow tungsten oxide, tungsten (the yellow tungsten WO3), blue tungsten oxide (referred to as blue tungsten W20O58 or WO2.90) and brown tungsten oxide (WO2) collectively known as tungsten oxide. The tungsten oxide can be used as raw material for the production of tungsten powder, tungsten because of its unique nature purple to purple tungsten tungsten powder products as raw materials, has generated fast, fine-grained and so on.

Purple tungsten oxide is pure secondary ammonium tungstate reaction under argon, then the Purple tungsten oxide deoxy prepare tungsten powder particles. (Purity: 99.99%, dewpoint -40℃), tungsten powder oxidized in the air. Tungsten oxide and tungsten powder is reduced in hydrogen, the sample was placed in a laser particle size distribution measuring instrument and the field emission scanning electron microscope, can exhibit its properties. Through two cyclic oxidation and reduction of three, will be ultrafine tungsten powder. Particle size distribution of ultrafine tungsten powder 0.1 μm to 1.0 μm is between 95.73%.

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Purple tungsten oxide is a different form of tungsten oxide, tungsten, has a unique crystal structure and other tungsten oxide (blue tungsten), its performance is also very different. Blue tungsten large particles have sharp edges, gathered together by a small cube, in varying degrees of broken surface, and covered with cracks; morphology purple tungsten is significantly different from the other three, each Large particles are needle-like or rod-like grains of loose particles group. All of the tungsten oxide pellets.

Purple tungsten oxide production in general is ammonium paratungstate (APT) as raw materials in industrial rotary furnace bamboo, under certain conditions (such as access NH3) were calcined, due to the decomposition of NH3 H2, so that APT mild reducing atmosphere calcined gradual decomposition of tungsten oxide reduction generated purple. The total chemical reaction equation is as follows: 3 [5 (NH4) 2O • 12WO3 • 5H2O] = 2w18O49 + 40H2O + 35H2 + 15N2.

Characteristic purple tungsten oxide products, tungsten oxide appearance usually pale purple purple or blue-purple. Purple major components and physical properties of tungsten oxide, and its bulk density between 1.9 to 2.3, the oxygen index ≦ 2.72, specific surface between 1.3 to 3.0.

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Purple tungsten oxide (Violet Tungsten Oxide, VTO), referred to as purple tungsten. Purple tungsten oxide refers to paratungstate (Ammonium Paratungstate, APT) as raw material was calcined under certain conditions, decomposition, reduction generated purple tungsten oxide. General purple or blue-purple crystalline powder. By strong fissile octahedral structure, intrinsic crystalline needle and rod. Purple Tungsten is a tungsten oxide, the chemical formula for WO2.72 or W18O49. Purple and yellow tungsten oxide, tungsten (the yellow tungsten WO3), blue tungsten oxide (referred to as blue tungsten W20O58 or WO2.90) and brown tungsten oxide (WO2) collectively known as tungsten oxide. The tungsten oxide can be used as raw material for the production of tungsten powder, tungsten because of its unique nature purple to purple tungsten tungsten powder products as raw materials, has generated fast, fine-grained and so on.

Purple tungsten oxide is a tungsten oxide. Purple tungsten oxide history can be traced back to produce tungsten oxide. Tungsten has a long history, dating back to the 18th century. It was first discovered by Peter Woulfe. Tungsten first to be called wolfram, element symbols for W. Swedish chemist Carl Wilhelm Scheele discovered scheelite, and its been a lot of research. In 1841, chemist Robert Oxland developed a production of tungsten trioxide and the first step of sodium tungstate. He was awarded a patent. Soon after, he is considered the founder of tungsten chemical systems.

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