The Properties And Applications of Tungsten Powder


Jul 26, 2023

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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 grayish-black with 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, at 500-700°C, the tungsten dioxide is converted to tungsten oxide; and the second at 700-900°C, or at temperatures of 700900°C. Tungsten is converted to tungsten. The reduction reaction takes place in an electric tube or rotary furnace.

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 parameters that determine the reduction rate include the temperature, the quantity of tungsten-oxide in the burning boat and its speed, as well as the flow rate of the hydrogen. As the temperature of reduction increases, the tungsten particles become coarser.

This method is used in addition to the tungsten-oxide carbon reduction method. The tungsten obtained from this method has a low purity. In addition, work 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

The production of ferro tungsten and cemented carbide is mainly done with tungsten. 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, combustion tubes and more. 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 shaped into plates, tubes, or products in certain shapes. Tungsten powder can be mixed with other metals to create various alloys. These include tungsten and copper alloys, tungsten and molybdenum alloys, tungsten and rhenium, high-density alloys. Using tungsten to make carbide powder, which is used to prepare tools like turning tools, drill bits, milling cutters or molds, is another important use.

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