The raw material used for the preparation of tungsten processing products, tungsten alloys, and other tungsten items 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 carbonate 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 a rotary oven or an electric tube.
The properties of reduced powder tungsten (such as purity and particle size) are largely dependent on the reduction process. The main factor is the reduction process. In a tube oven, when reducing the tungsten, the main process variables that affect the rate of reduction are the reduction temperatures, the loading of tungsten Oxide in the burning boat and the moving speed of burning boat. As the temperature of reduction increases, the tungsten particles become coarser.
This method is used in addition to the hydrogen-reduction method. This method yields tungsten with low purity. Also, research is being done 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, wear-resistant, and used for gas turbine blades, combustion tubes and tooling. 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 of various 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 metals to create various alloys. These include tungsten and copper alloys, as well as tungsten and molybdenum. Using tungsten to produce tungsten carbide powder, which is used to create cemented carbide tools like turning tools, milling tools, drill bits, and molds, is another important use of tungsten.
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