The Properties And Applications of Tungsten Powder

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Tungsten powder The raw material used for the preparation of tungsten alloys as well as tungsten products 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 hydrofluoric, nitric and sulfuric acids. It is then melted using a sodium hydroxide/sodium carboxide mixture.
Tungsten is a grayish-black metal that has a metallic sheen (centered cubic crystal in the body). Tungsten powder has a slight solubility in nitric and sulfuric acids, as well as aqua regia. However, it is not soluble in water or hydrofluoric and potassium hydroxide.

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, at 500-700°C, tungsten dioxide is converted to tungsten oxide; the second at 700-900°C, or at 700900°C. Tungsten is converted to tungsten. The reduction reaction takes place in an electric furnace, a rotary oven or even a 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 process variables that affect the rate of reduction are the reduction temperatures, the loading of the tungsten oxide into the burning boat and its speed, as well as the flow rate of the hydrogen. As the temperature of reduction increases, the particle sizes of the tungsten become coarser.

This method is used in addition to the hydrogen-reduction method. The tungsten obtained from this method has a low purity. Further research is being done on the reduction tungsten with metals such as aluminum, calcium and zinc. 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 turbines 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 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. Mixing Tungsten Powder with Other Metal Powders Can Be Made Into Various Tungsten Alloys. These include tungsten and molybdenum alloys, tungsten and copper alloys, high-density alloys. Another important use of tungsten is the preparation of cemented carbide tools like turning tools, milling tools, drill bits, and molds.

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