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Tungsten powder. Brand chemical composition.

Tungsten powder. Brand chemical composition.

General characteristics

Tungsten is the 74th element of the table of Mendeleev is a solid refractory metal gray color, indicated by — W is Extracted from ore concentrates. Has a density of 19.25 g/cm3, melting point 3422 °C, boiling point is 5500 °C.

Physical properties W
Atomic (molar) mass, g/mol Of 183.84
Oxidation 6, 5, 4, 3, 2, 0
Density [g/cm3] 19,25
The melting temperature t°C 3422°C
The heat of fusion kJ/mol 191
The thermal conductivity K [W/(m·K)] The 162.8
Heat of evaporation kJ/mol 4482

Tungsten powder is a heavy particulate mass with high refractoriness and hardness. Widely used for the manufacture of compact metal and as the basis for the sintering of heat-resistant alloys by method of powder metallurgy… First get rods that are blanks for electrodes, sheets, wire rods.

Brand

The main brands are: VP and PVV (highly active tungsten powder), PVN (low-level tungsten powder), PVT (white powder). The production of these brands standardized the technical specifications 48−19−72−92. The standard diameter of the grains of PVN is 3.5 — 6 µm, OEM is 3.5 — 6 µm for APO and 0.8 — 1.7 µm. But in some cases (40%) the grain size of PVN allowed more than 4 microns.

Application

Refractoriness and hardness of tungsten make it suitable for use in the manufacture of high speed tool steels, alloy heat resistant and wear resistant, very rigid, electrical equipment, welding electrodes. Tungsten powder is used as the main component of non-consumable electrodes for welding, alloying high-speed tool steels, wear-resistant, heat-resistant alloys (Stellite, etc.). The basis wolframalpha solid alloy grade VC carbide is WC.

Name mark The feedstock
highly active tungsten powder PVV The ammonium paratungstate is of high purity or anhydride of tungsten ammonium paratungstate, And varieties.
low-level tungsten powder PVN Mamaliberty the ammonium paratungstate or anhydride paratungstate And varieties.
technical tungsten powder HTP The ammonium paratungstate or tungsten oxide, ammonium paratungstate.
Name Mass fraction of impurities not more than, %
component PVV HTP PVN
sulfur 0,004 0,004 0,004
molybdenum 0,02 0,2 0,04
carbon 0,003 0,003 0,003
arsenic 0,003 0,03 0,005
iron 0,006 0,02 0,008
aluminium 0,001 0,002 0,001
silicon 0,002 0,005 0,003
calcium 0,002 0,005 0,005
Nickel

0,005

0,004

0,008

0,005

0,005

0,005

phosphorus
Mass fraction      
tungsten . . .

Mass fraction of tungsten is called concomitant undetectable impurities and metal-based.

Tungsten powder, dispersion which has an average diameter of grains Fischer, complies with the following standards:

Mark CP. diameter of grains Fischer, µm
PVN 3,5 — 6,0
PVV 0,8 — 1,7
HTP 3,5 — 6,0

Note

— the content of grains brand of PVN is larger than 4 microns can not exceed 40%.

— bulk density brands PVT, PVN must be in the range of 3.0 — 5.5 g/cm3

— bulk density PVV rejection symptom is not considered, it is determined to note.

Buy at best price

Large selection of high quality tungsten powders in stock LLC «AVEK global» can satisfy any consumer. Quality is ensured absolute compliance with all technological norms of production. We offer products from warehouses in Russia, Ukraine with delivery to any address. Our experts will pack, complement, promarker your purchase, and will also follow up on delivery. All available products are certified. The price depends on order volume and additional conditions. Delivery times are minimal. At wholesale orders are provided preferential discount.