Metal powders are often used modern industry where the metal in its pure form does not apply. Depending on the composition of the powders they are the basis of certain technologies.
Molybdenum — very refractory metal gray color. Dmitry 42th element of the periodic table, has the following properties: Density — 10.2 g / cm 3, melting point 2620 ° C + boiling point +4630 ° C. Among the various products of this metal (sheets, wire, rod) is widely used molybdenum powder. The molybdenum content in the powder brand MUF is approximately 99.5%, with 92% of the powder has a grain dimension maskimum 5 microns.
Such powder is the raw material for the production of compact molybdenum. With powder metallurgy produced rods of different size, of which the rolled wire, rods, sheets. Molybdenum is also used as an additive to heat-resistant alloys to improve their properties.
Tungsten — refractory and hard metal dark gray, element number 74 Dmitry Mendeleev’s table, has the following physical characteristics: density — 19.3 g / cm 3, the melting temperature of + 3422 ° C, the boiling point of + 5500 ° C.
Stamps tungsten powder — PVN, PVV, PVT, V. AP This product is produced according to TU 48−19−72−92. The grain diameter of 3.5−6 microns MPP, POE — 0.8−1.7 microns, HTP — 3.5−6 microns. Up to 40% of the grains of the powder should be smaller DID 4 microns.
Tungsten powder is needed for the production of compact metal. With powder metallurgy produced rods of different size, of which the rolled wire, rods, sheets. The characteristics of this metal allows to use it to create high-strength steels, and wear-resistant alloys zharovynoslivyh, welding rods, electric lighting equipment. Tungsten carbide — a special type of VC carbide.
This compound is tungsten (W) to the carbon of formula (c) — WC or W 2 C. The main property of tungsten carbide — high strength at high temperatures. Tungsten carbide is indispensable in the production of the most hard alloys. The most commonly used alloys, series VC and specifically VK6 and BK8.
Tungsten, as it is known, is headed by a class the most refractory metals. His advances only carbon, which is not a metal and has a melting point above. The main use of this metal — iron and steel industry, where W is the basis of the most refractory alloys and superhard tools for shock-rotary drilling. It is widely used for the manufacture of filaments in lamps, cathode ray tubes, in persistent high temperature crucibles, target X-ray machines.
Pure tungsten metal is very ductile and flexible, but all the smallest carbon impurities to instantly make it very hard. Tungsten does not lend itself to chemical reagents, is stable in nitric acid, hydrochloric acid, «aqua regia». Only at very strong heating it can be dissolved in aqua regia, or react with the chlorine and sulfur. Above t ° to 1400 ° C tungsten reacts with carbon — formed very durable tungsten carbide. It is used in heavy machinery for the manufacture of superhard tools for milling, drilling.
The high density of tungsten makes it suitable for the manufacture of balances shells guns, bullet cores. Tungsten is used in high temperature vacuum furnaces as resistance heating elements. The alloy of tungsten and rhenium is used as a thermocouple. To date, this metal is one of the leading heavy metals which are used in various fields of modern industry.
Molybdenum — one of the few alloying elements that enhance strength and resistance to corrosion. Ever since time immemorial, the metal used for the production of cold steel in Japan.
Products made of this material — a wire or ribbon are used to input current to bulbs, creating high-temperature furnace heating elements, molybdenum Various compounds — sulphides, oxides, molybdates — are used as catalysts in reactions dye pigments. Molybdenum hexafluoride is used for applying metallic Mo on a variety of materials, MoS 2 is used as a solid high temperature grease.
Molybdenum alloys, as well as the metal itself, characterized by very high elasticity, low coefficient of expansion, excellent temperature resistance and low thermal neutron capture cross. Conduction of electrical current from molybdenum is slightly lower than that of copper but superior iron component. According to the strength of it is slightly inferior to tungsten, but it is easier to handle the pressure.
Mo schiroko used in the aviation, space industry, industrial chemistry, metallurgy, defense industry, production of glass and ceramics. The percentage of the metal in the crust — 4% and is not found in the free form. Most of the total produced in the manufacture of molybdenum is used for dopants steel or iron alloys and the like.
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