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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.
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