Molybdenum — 42-th element of the periodic table, which is represented by Mo. It is hard refractory metal lead tone, sp. weight — 10.2 g / cm³, t ° melting 2620 ° C. Molybdenum powder — gray fine-dispersed mass comprises Mo at least 99.196%. It is used as a catalyst, dopant superalloys, it serves as the basis for semiconductor substrates, electrical parts. The molybdenum sputtering on the surface of parts increases the strength and performance of mechanisms.
|Mo atomic number||The atomic (molar) mass g / mol||The degree of oxidation||Density g / cm 3||Melting point t ° C||The boiling point of t ° C||The heat of fusion kJ / mol|
|42||96||0, 2, 3, 4, 5, 6||10.2||2620 ° C||4630 ° C||28|
The main brand is the brand of molybdenum powder MUF, which is produced according to TU 48−19−316−80 «Molybdenum powder. Those. conditions». This stamp Mo content of not less than 99.5%, 92% have a grain size up to 5 microns.
The powder is a raw material for the production of compact molybdenum. Initially, powder metallurgy method, forming rods of various sizes. In turn, the rods are blanks for the manufacture of molybdenum wire, sheets, rods. Advantages Mo allow its use as an alloying element.
|powder Brand||Mo not less% *||Zn||Mg||Si||Ni||Fe||K||Na||Ca||Mn||C||W||Al||ΣMe **|
* Blowing impurity Cl, N, H, C, O, S, F is not taken into account in the calculation of the proportion of molybdenum.
** ΣMe — the amount of metal impurities.
The percentage of molybdenum powder PM99,95.
|Element||g / g||Element||g / g||Element||g / g|
Advantages of molybdenum:
— Mo density (10.2 g / cm 3) is almost two times less than the density of the tungsten (19.3 g / cm 3), therefore, based on molybdenum alloys at t ° to 1370 ° C, exhibit high specific strength;
— High t ° melting and heat resistance;
— A high modulus of elasticity;
— A slight thermal expansion coefficient;
— Is resistant to alkaline solutions in hydrochloric, sulfuric and hydrofluoric acids of different concentrations;
— It has a small capture cross section for thermal neutrons.
— Mo has a small okaliynost;
— Insufficient low temperature ductility;
— Fragility of the welds;
— Hardening peening using molybdenum may be applied only to at t ° 700−800 ° C, and at a higher temperature because of softening return occurs.
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