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The raw material used for the preparation of tungsten processing products, tungsten alloys and tungsten goods is powdered tungsten.
Tungsten Powder Properties
The hardest metal in the world is tungsten. The hardness ranges from 200-250 for sintered rods, and 350-400 for rods passed through the rotary hammer. Tungsten is dissolved in an acid mixture of nitric and hydrofluoric acids and then melted using a sodium hydroxide/sodium carboxide mixture.
Tungsten is a grayish-black metal that has a metallic sheen (a cubic crystal with the body at its center). Tungsten powder has a slight solubility in nitric, sulfuric, and aqua regia acids; however, it is not soluble in water.
Tungsten Powder Preparation
Tungsten is produced by hydrogen reduction. The preparation of tungsten powder using the hydrogen reduction method can be divided into two steps: in the first step, the tungsten dioxide is converted to tungsten oxide at a temperature between 500 and 700; the second is done at 900700. Tungsten is converted to tungsten. The reduction reaction takes place in an electric furnace, rotary furnace or tube furnace.
The properties of reduced powder (such purity, particle sizes, particle size composition etc.) depend mainly on the reduction process. The main factor is the reduction process. In a tube oven, when reducing the tungsten, the main parameters affecting the reduction rate include the reduction temperature. Other factors are the loading of the burning boat with tungsten oxide, its speed, flow rate, and moisture content of the hydrogen. As the temperature of reduction increases, the tungsten particles become coarser.
This method is used in addition to the hydrogen-reduction method. The tungsten obtained from this method has a low purity. Moreover, research is being carried out on the reduction tungsten with metals such as aluminum, zinc, calcium etc. Research is also underway. This method can produce ultra-fine tungsten particles with a particle size less than 0.05mm.
Tunsten Powder Applications
Tungsten is used mainly in the productions of ferro tungsten and cemented carbide. Tungsten, chromium molybdenum and cobalt are combined to form an alloy which is heat resistant and wear resistant. It can be used for making tools, surface hardening metals, gas turbine rotor blades and combustion tube. Tungsten, tantalum, molybdenum and niobium powders, for example, form a heat-resistant alloy. This alloy is refractory.
High-density tungsten-nickel-copper alloy is used as a radiation shield. Metal tungsten wires, rods, sheets, etc. These are used for the production of electronic tubes, light bulbs and electrodes for welding. Tungsten can be sintered to create filters with different porosities.
Tungsten Powder is the main raw materials for powder metallurgy and alloys. Pure tungsten is processed into materials like wires and rods. It can also be made into tubes, plates and other products. Tungsten powder can be mixed with other metal powders to create various tungsten alloys, including tungsten and molybdenum alloys, tungsten and rhenium, tungsten and copper alloys, as well as high-density alloys. One of the most important uses for tungsten is making tungsten carbide to prepare cemented-carbide tools like turning tools, milling tools, drill bits, and molds.
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