Tungsten molybdenum crucible W crucible Mo crucible


Tungsten molybdenum crucible W crucible Mo crucible

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As a nonferrous metal, tungsten has a very high strength and hardness. Because of this 2.Main Features, the tungsten carbide with high hardness and strong wear resistance has been applied in cutting tools and mining tools on a large scale.

Tungsten is the refractory metal with the highest melting point. General metals with a melting point higher than 1650℃ and a certain reserve and a melting point higher than the melting point of zirconium (1852℃) are called refractory metals. Typical refractory metals are tungsten, tantalum, molybdenum, niobium, hafnium, chromium, vanadium, zirconium, and titanium. As a refractory metal, the most important advantage of tungsten is that it has good high temperature strength and good corrosion resistance to molten alkali metals and vapor. It only appears above 1000℃. Molybdenum and tungsten have very similar properties, prominent boiling point and electrical conductivity, small linear thermal expansion coefficient, and easier to process than tungsten.

The thermal conductivity of molybdenum metal [135 watts / (m · open)] works best with specific heat [0.276 kJ / (kg · open)], making it a natural choice against thermal shock and thermal fatigue. Its melting point is 2620℃, secondary to tungsten and tantalum, but its density is much lower, so its specific strength (strength / density) is greater than tungsten, tantalum and other metals, which is more effective in applications with critical weight requirements. Molybdenum still has a high intensity at 1,200℃.

Main Features

Tungsten has a high melting point, a very low vapor pressure, and a small evaporation rate. The chemical properties of tungsten is very stable, not reactive with air and water at room temperature, insoluble in hydrochloric acid, sulfuric acid, nitric acid and alkali solution. Dissolve in royal water and a mixture of nitric acid and hydrofluoric acid. At high temperature, it can combine with chlorine, bromine, iodine, carbon, nitrogen, sulfur, but not with hydrogenation. The pure tungsten melting point reaches 3410℃, which still has high strength at about 1300℃, while the tungsten-based alloy also has high strength at about 1800℃ and has good resistance to thermal impact.

Product Application

Due to the high density of tungsten, High hardness, Thus, it has become an ideal material for making high specific gravity alloys, These high specific gravity alloys are divided into W-Ni-Fe, W-Ni-Cu, W-Co, W-WC-Cu, W-Ag and other major series, This kind of alloy has the 2.Main Featuress of high ratio, high strength, strong absorption radiation ability, large thermal conductivity, small thermal expansion coefficient, good electrical conductivity, weldability and good processability, Is widely used in aerospace, aviation, military, oil drilling, Electrical instruments, medicine and other industries, Such as manufacturing armor, heat sink, control rudder balance hammer and contact materials such as knife switch, circuit breaker, spot welding electrode, etc.

Electronic field

Tungsten has strong plasticity, small evaporation speed, high melting point and strong electron emission ability, so tungsten and its alloys are widely used in the electronic and power supply industry. For example, tungsten wire has a high luminous rate and long service life, so it is widely used in the manufacture of various bulb filament, such as incandescent lamp, iodine tungsten lamp, tungsten wire can also be used in manufacturing the direct hot cathode and gate of electronic oscillator tube and a variety of electronic instruments in the side thermal cathode heater. The 2.Main Featuress of tungsten make it also suitable for TIG welding and other electrode materials for similar work.

Chemical industry

Tungsten compounds are commonly used as catalysts and inorganic colors, such as tungsten disulfide is used as a lubricant and catalyst in synthetic gasoline, bronze tungsten oxide is used in paintings, calcium or magnesium tungsten is often used in phosphors.

Other areas

Because tungsten is similar to boryl silicate glass, it is used to make glass or metal seals. Tungsten has low sensitivity and is used to make high purity tungsten gold jewelry. In addition, tungsten is also used in radioactive medicine, and some instruments will also use tungsten wire.

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