Powder is the main component for making various tungsten products from billets that serve as primary blanks for producing other semifinished products to ready-made products of complex shape made by methods of powder metallurgy. It is one of the most important elements of the chain of creating tungsten products as its properties influence the product properties.
Tungsten powder can be purchased on the Prices page of the website of Metotechnics so as via e-mail or by phone.
See the corresponding sections for details about the grades, production methods and applications of the above-mentioned product.
Grades
This products has the following grades: PWT, PWV, PWN and PWC. Depending on further application and grades wolfram content should be at least 99.68-99.9%.
PWC is high-purity wolfram powder. It contains at least 99.9% of tungsten. PWT (process), PWN (low-active), PWV (high-active) has the lowest wolfram content - 99.68%, 99.89% and 99.92% correspondingly.
PWN, PWV, PWT and PWC composition is regulated by TC 48-19-72-92 and TC 48-19-57-91 standards.
Production
Powder is made by reduction. Wolfram anhydride (WO3) serves as the primary raw material. The reducing reagent reacts with the non-metallic component (oxygen) and pure metal is generated. Hydrogen (H) or carbon (C) are used as reducing reagents. The former is more preferable as reduction with carbon enriches tungsten powder with carbides. This worsens the material machinability and makes ready-made products brittleness. The desired properties of the semifinished product are provided due to controlling the reduction conditions. E.g., fast temperature increase and low speed of supplying hydrogen for reduction makes the grains larger.
The particle sizes should be the following:
PWN - 3.5-6.0 µm;
PWV - 0.8-1.7 µm;
PWT - 3.5-6.0 µm.
The content of grains larger than 4 µm in PWN grade should not be exceed 40%.
Pour density is another important property of the above-described products. For PWT and PWN it should be 3.0-15.5 g/cm3, for PWV it is not regulated and is given for reference only.
Technological parameters such as particle size, pour density and supply condition are regulated with TC 48-19-72-92 and TC 48-19-57-91 standards.
Tungsten powder with small grains is also called tungsten dust.
Application
As a rule, powder serves as raw materials for further production of compacted wolfram (see Wolfram (tungsten). Properties, application, production, products). Powder metallurgy methods that allow making billets of different sizes are used for this. In turn, they serve as blanks for wolfram sheets, electrodes, rods and wire. Useful properties of this metal determined its application in production of hard alloys, high-speed and instrument steels, heat-proof and wear-resisting alloys, welding electrodes and lighting equipment.
Tungsten powder is applied as an alloy additive or main component of high-speed and instrument steels so as wear-resisting and heat-proof alloys (e.g., stellites). It is used for producing nonconsumable tungsten welding electrodes and wire is used in filament lamps. Wolfram carbide serves as the basis of hard alloys like wolfram-cobalt ones.
Prices
The cost of wolfram powder is given on Prices page. Also the range of available grades is given.
Calculate wolfram product mass
