W: Tungsten, chemical symbol W, atomic number 74, atomic mass 183.85, density 19.3 g/cm3. After smelting, tungsten is a silver-white glossy metal with a very high melting point, a great hardness, anti-friction and corrosion resistance, high thermal conductivity, low coefficient of thermal expansion, low vapor pressure, low evaporation rate, and relatively stable chemical properties.
The most important advantage of tungsten is that it has good high temperature strength and corrosion resistance to molten alkali metals and steam.
Tungsten is widely used in modern science and technology in the form of pure metals and alloys, the most important of which are alloy agents for iron and steel, tungsten carbide and superalloys.
WLa: Tungsten-lanthanum alloy is the addition of lanthanum oxide (La2O3) by weight between 1% and 2% in tungsten. Compared with pure tungsten, tungsten-lanthanum has the following advantages: better creep resistance, higher recrystallization temperature and deformation rate, and better high-temperature strength.
WCu: Tungsten-copper material is a kind of alloy of tungsten and copper, which has the advantages of tungsten and copper, high temperature resistance, arc ablative resistance, high strength, high ratio, good electrical and thermal conductivity, easy to be machined, and has the characteristics of sweat cooling, widely used in machinery, electric power, electronics, metallurgy, aerospace and other industries.
High-density tungsten alloy: High-density tungsten alloy is a kind of alloy material with tungsten as the base (tungsten content is usually 79%~97%) and a small amount of Ni, Fe, Cu, Co, Mo, Cr and other elements. It is also called a heavy alloy. The density range is 15.2~19g/cm3. More commonly used are: W-Ni-Cu and W-Ni-FE. This material is widely used in medical equipment, aerospace, electrical, industrial counterweight and other fields because of its remarkable properties in density, hardness, strength, ductility, conductivity, thermal properties and other physical properties.
WAl: Tungsten aluminum alloy is a tungsten matrix doped with elements such as aluminum, potassium and so on. Compared with pure tungsten, tungsten aluminum alloy enhances the material’s flexibility and recrystallization temperature to a certain extent, thus prolonging the product’s service life.
Molybdenum: Elemental symbol: Mo.
Atomic number 42.
VIB group of metals.
Density: 10.2g/cm3,
Melting point: 2610°C,
Boiling point: 5560°C.
Molybdenum is a silver-white metal, hard and tough, with a high melting point and high thermal conductivity. As a transition element, it is easy to change its oxidation state, and the color of molybdenum ions will also change with the change of oxidation state. Molybdenum is an essential trace element for the human body and animals and plants. It plays an important role in the growth, development and heredity of the human body and animals and plants. The average content of molybdenum in the earth’s crust is 0.00011%, and the global molybdenum resource reserves are about 11 million tons, and the proved reserves are about 19.4 million tons. Molybdenum is widely used in steel, petroleum, chemical industry, electrical and electronic technology, medicine and agriculture because of its high strength, high melting point, corrosion resistance and abrasion resistance.
MLa(MLR): Molybdenum-lanthanum is a kind of molybdenum-base alloy doped with lanthanum oxide. Its recrystallization temperature is higher than that of pure molybdenum, which has better high-temperature performance, stronger creep resistance and longer service life.
TZM: The earliest molybdenum alloy in industrial production is titanium-zirconium molybdenum alloy, which is formed by adding zirconium on the basis of Mo-0.5Ti alloy. In refractory metal alloys, TZM alloys are known for their high strength, good thermal conductivity, low linear expansion coefficient, high recrystallization temperature, and easy to process. TZM alloys, in particular, are outstanding molybdenum alloys. The composition of TZM alloy is: titanium 0.4~0.55%(WT), zirconium 0.06~0.12%(WT) and carbon 0.01 ~ 0.04% (WT), with molybdenum as the residual.
Compared with pure molybdenum, TZM has better creep resistance, higher recrystallization temperature, better high temperature strength and better welding performance.
WMo Alloy: Tungsten and molybdenum alloys can be used at higher temperatures than molybdenum or molybdenum alloys. If tungsten molybdenum alloy is used as electrode, nozzle and thimble parts in the furnace of refractory ceramic fiber with high melting point, its service life is much longer than that of pure molybdenum products. The commonly used components of tungsten and molybdenum alloys are: Mo – 30W, Mo – 50W and Mo – 85W.Tungsten-molybdenum alloy can be regarded as the transition alloy between molybdenum and tungsten. Therefore, the alloy can be used in the wide temperature range between molybdenum and tungsten.
Post time: Mar-25-2023