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Molybdenum powder. Stamps, chemical composition.
general characteristics
Molybdenum is a refractory metal of light gray color, the 42nd element of the chemical table, where Mo is denoted. Its density is 10.2 g / cm³, the boiling point is 4630 ° C, and the temperature is 2620 ° C. Molybdenum powder is a finely dispersed mass containing not less than 99.196% Mo. It is used as an alloying component and a catalyst for the production of substrates for semiconductors, the manufacture of light equipment, spraying on the surface and so on.
| Physical properties Mo | |
|---|---|
| The temperature at which these characteristics were obtained t ° C | 20 ° С |
| Coefficient of linear thermal expansion α [1 / ° С] | 4.9 x 10 -6 |
| The density of metallic Mo [g / cm 3 ] | 10.2 |
| Melting point t ° C | 2620 ° С |
| Specific heat at 20 ° C С [kJ / (kg · deg)] | 0.256 |
| Thermal conductivity K [W / (m · K)] | 142 |
| Specific electrical resistance R Ohmmm 2 / m | 0.054 |
Manufacturing
The most demanded molybdenum powder is the MCH brand produced in accordance with the specifications 48−19−316−80. This brand of powder contains not less than 99.5% Mo, of which 92% of particles up to 5 μm in size.
Application
Molybdenum powder is in demand as a raw material for the production of compact metal. By the method of powder metallurgy, firstly the staffs of the necessary sizes are formed, which then serve as the preforms for the production of sheets, wires, rods. The advantages of molybdenum make it possible to widely use it as an alloying component.
| Brand of molybdenum powder | Molybdenum, not less than *, in percentage | Chem. Composition, not higher than ppm (μg / g) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Si | Fe | Al | Ni | Na | K | Mg | Ca | C | W | Mn | ΣMe ** | Zn | ||
| PM99.95 | 99.95 | 50 | 100 | thirty | 50 | thirty | 80 | 20 | 40 | 40 | 130 | 10 | 500 | 5 |
* Gas-forming impurities such as O, N, C, S, H, Cl, F are not taken into account in calculating the molybdenum fraction.
** ΣMe is the admixture of metals in the sum.
The main advantages of molybdenum
— has high heat resistance and melting point;
— its density is 10.2 g / cm³, almost half the density of tungsten (19.3 g / cm³), due to which alloys on a molybdenum basis at a temperature up to 1370 ° C lead in terms of specific strength;
High modulus of elasticity;
— low coefficient of temperature expansion;
— has a small thermal neutron capture cross section;
— resistance to solutions of alkalis, hydrochloric, sulfuric, hydrofluoric acids of different concentrations.
disadvantages
— high fragility of welding seams;
— low plasticity at low temperatures;
— a small amount of finesse;
— hardening of molybdenum by means of cold work is applied only at t ° up to 700−800 ° C, at a higher temperature there is softening due to the return.
Buy at a bargain price
A large assortment of high-quality molybdenum powders in the warehouse of Avek Global LLC is able to satisfy any consumer. The quality of the finished products is ensured by the absolute observance of all technological production standards. The lead time for orders is minimal. If you have any questions, you will receive an exhaustive consultation from experienced managers. For wholesale orders, the company provides discounts.