Metal powders are often used in modern industry where the pure metal is not applicable. Depending on the composition of the powders they are the basis of certain production technologies.
Molybdenum is a very refractory metal grayish color. 42-th element of the table, Dmitri Mendeleev, has the following properties: density — 10.2 g/cm3, melting point +2620°C, boiling point +4630 °C. Among various products made of metal (sheet, wire, rod) is widely used molybdenum powder. The molybdenum content in the powder brand MUF is approximately 99.5%, while 92% of the grain of powder has a dimension of maskimum 5 microns.
This powder is used as raw material for the production of compact molybdenum. Using powder metallurgy to receive rods of different sizes, of which the rolled wire, bars, sheets. Molybdenum is also used as an additive to heat-resistant alloys to improve their properties.
Tungsten — solid refractory metal dark gray color, the element No. 74 of the table, Dmitri Mendeleev, has the following physical characteristics: density — 19.3 g/cm3, melting point is +3422°C boiling point +5500°C.
Brand tungsten powder — PVN, PVV, PVT, V. P. This product is made according to TU 48−19−72−92. The diameter of the grains PVN of 3.5−6 µm, PVV and 0.8−1.7 µm, the tip is 3.5 — 6 µm. Up to 40% of the grains of powder PVN must be smaller than 4 µm.
Tungsten powder needed for the production of compact metal. Using powder metallurgy to receive rods of different sizes, of which the rolled wire, bars, sheets. Characteristics of this metal make it suitable for creating high-strength steels, resistant to high temperatures and wear-resisting alloy bars for welding, electric equipment. Tungsten carbide is a particularly hard alloy of the type VK.
This compound is tungsten (W) with carbon © with the formula — WC or W2 C. the Main property of tungsten carbide — greater strength at high temperatures. Tungsten carbide is indispensable in the manufacture of the hard alloys. The most commonly used alloys of series VK, specifically VK6 and VK8.
Tungsten, as is known, heads the class of the refractory metals. It is ahead of only carbon, which is not a metal and has a melting point above. The main use of this metal and metallurgical industry, where W is the basis of most refractory alloys and superhard tools for percussive-rotary drilling. It is widely used for the manufacture of filaments for lamps, cathode-ray tubes, high temperature-resistant crucibles, targets, x-ray machines.
Pure metallic tungsten is a very plastic and flexible, but any minor impurities of carbon instantly make it very hard. Tungsten is unaffected by chemical reagents, resistant to nitric and hydrochloric acid, «Aqua Regia». Only at extremely high temperatures it can be dissolved in Aqua Regia or react with chlorine and sulfur. Higher t° 1400 °C, the tungsten reacts with carbon forms a very durable tungsten carbide. It is used in heavy engineering for the manufacture of superhard tools for milling, drilling.
The high density of tungsten allows it to be used for the manufacture of counterweights shells shells, cores of bullets. Tungsten is used in high temperature vacuum furnaces resistance heating elements. Alloy of tungsten and rhenium is used as a thermocouple. Today, this metal is one of the leaders of heavy metals, which are used in various fields of modern industry.
Molybdenum is one of the few alloying elements which improve the strength and resistance to corrosion. Since ancient times this metal was used for the production of knives in Japan.
Products made of this material as a wire or tape, used for input current in the bulbs to create heating elements, high temperature furnaces, Various compounds of molybdenum — sulfides, oxides, molybdates — are used as catalysts of reactions, pigments dyes. Molybdenum hexafluoride is used during the application of metallic Mo on various materials, MoS2 is used as a high temperature solid lubricant.
Alloys of molybdenum as the metal itself, have a very high elastic ratio, small expansion coefficient, excellent temperature resistance and low capture cross section for thermal neutrons. The conduction of electrical current from molybdenum is slightly lower than that of copper, but exceeds the rate of iron. According to the strength is slightly inferior to tungsten, but it easier to handle the pressure.
Mo shiroko used in aviation, space industry, industrial chemistry, metallurgy, defense industry, production of glass and ceramics. Percentage of this metal in the earth’s crust — 4% and it does not occur in free form. Most of the mined molybdenum is used in the manufacture of alloying elements, the alloys of cast iron or steel and the like.
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