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Overview of rare earth metals and intermediate alloys

The vast majority of single rare earth metals and their intermediate alloys are used to produce new rare earth metal materials such as neodymium iron boron, samarium cobalt permanent magnet and super magnetostriction and non-ferrous metal alloys such as AI-RE, Mg-RE, Cu-RE, Zn- RE, W-RE, Mo-RE, etc. In addition, there are a few rare earth metal applications that use some special properties to prepare functional materials. Neodymium metal, praseodymium and praseodymium neodymium alloy Neodymium has the hard-magnetic properties caused by the good 4f electron spin arrangement, and has become the largest user of neodymium iron boron permanent magnet materials. In recent years, the global neodymium iron boron materials have developed rapidly, and the large application of neodymium metal in neodymium iron boron permanent magnet materials has driven the rapid development of the rare earth industry. In addition, neodymium metal as an alloy additive has good purification, modification and alloy...

Nitinol Applications

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Although many nitinol applications are not well-known to the public, some applications are quite routine and familiar. The spectacle frame made of Nitinol severely deformed and then returned to normal. Similarly, a few years ago, when mobile phone antennas were made of Nitinol, they could bend without breaking or permanently bending. Another superelastic application of Nitinol is for orthodontic archwires. The orthodontist uses fixed nitinol wire to fix the teeth. Since the wire is super-elastic, it will try to restore its straight state and continue to exert force on the teeth. This can reduce frequent visits to orthodontists to tighten braces. Many little-known applications use Nitinol's shape memory function. A well-known computer manufacturer used Nitinol equipment to eject PCMCIA cards. In addition, Nitinol is also used to connect the end of the aircraft hydraulic tubing. Nitinol can make the magic shop spoon bend in hot water also because of its shape memory function Nitinol...

Interaction between rare earth metals and other elements

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Rare earth metals have typical metal properties. They have strong chemical activity and can form a variety of compounds, including hydrides, chlorides, silicides, carbides, organic / inorganic salts and complexes. This is the basis for the rare earth metal in the metallurgical industry as a purification, impurity removal and refinement modifier. Rare earth metals are unstable in air, and their stability increases with increasing atomic number; in other words, the rare earth metals with larger atomic radius have weaker oxidation resistance; light rare earth metals can be easier oxidized than heavy rare earth metals, and lanthanum is the most active. Lutetium and Scandium are the most resistant to air oxidation. Rare earth metals are widely used as reducing agents, which can reduce oxides of iron, cobalt, nickel, chromium, vanadium, niobium, tantalum, zirconium, titanium, silicon and other elements into metals. Due to the difference in the reducing ability of rare earth metals, and the ...

Heat treatment of niobium and niobium alloys

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The finished products of niobium and niobium alloy materials and their processing and preparation processes need to be annealed and heat treated. The heat treatment methods include homogenization heat treatment, stress relief heat treatment, recrystallization heat treatment and mechanical heat treatment. -Homogenization heat treatment. The homogenization heat treatment is to eliminate defects such as metastable phases and component segregation in the ingot by atomic diffusion, and to make the structure uniform and stable. The homogenization temperature of the niobium ingot is 1800~2000 ℃, the vacuum degree is 10-2~10-3Pa, and the holding time is 5-10h. -Stress-relief heat treatment. The purpose of stress-relief annealing is to eliminate or reduce the internal stress of the material and improve the mechanical and technological performance of the material. Therefore, at a given temperature, the stress and strain energy can be eliminated quickly. -Recrystallization heat treatment. The re...

Molybdenum-rare earth oxide alloy

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Molybdenum-rare earth oxide alloy (Mo-REO), also called rare earth molybdenum, is an alloy of molybdenum and rare earth element oxides, which is an oxide dispersion-strengthened alloy, similar to rare earth tungsten. Commonly used rare earth element oxides are Y2O3, La2O3, CeO2, and Nd2O3, Sm2O3, Gd2O3, and Sc2O3. They are usually added in the alloy in an amount of 0.5% -3.0% (mass fraction). The rare earth oxide doped molybdenum is a new material that has been systematically researched since the late 1980s. The addition of rare earth oxides can not only significantly increase the strength of molybdenum, improve the high temperature resistance of molybdenum, but also significantly increase the recrystallization temperature of molybdenum and reduce the brittleness of molybdenum restructure. It is an excellent high temperature structural material. The overall performance is better than the high-temperature molybdenum (Mo-ASK) and TZM molybdenum alloy originally considered to be the best...

The main physical properties of rare earth metals

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Rare earth metals as additives to magnesium, aluminum and their alloys, the first thing to consider is their density. The density depends on the relative atomic mass, atomic radius, and crystal structure of the rare earth metal. All rare earth metals have a close-packed hexagonal structure except for Europium, so their density depends on their relative atomic mass and atomic radius. Because of its small atomic weight, Scandium has a density of 2.989g/cm3, which is the smallest of all rare earth metals. It is approximately 70% higher than the density of magnesium (1.741 g/cm3) and approximately 10% higher than aluminum (2.7g/cm3). The density of Yttrium is 4.46g/cm3, which is larger than that of Scandium, but it has a smaller atomic weight than that of lanthanide, and is intermediate between scandium and lanthanide metals (from Lanthanum to Lutetium). Among all lanthanide metals, due to the shrinkage of the lanthanide series and the increase in atomic weight, their density generally in...

Sintered Titanium in hydrogen energy industry

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  Hydrogen energy is widely known as next generation new energy. There are three main core materials for hydrogen fuel cells: catalysts, gas diffusion layers, and proton exchange membranes. The gas diffusion layer not only functions as a supporting catalyst layer and a stable electrode structure in the electrode, but also has various functions of providing a gas passage, an electron passage, and a drainage passage for the electrode reaction. The use of high- Performance gas diffusion layer materials are beneficial to improve the overall performance of the electrode. Sintered porous metals  are widely used in electrochemical devices such as water electrolysers, unitised regenerative fuel cells (URFCs) as gas diffusion layers (GDLs), and batteries. Edgetech industries LLC can provide high quality  porous titanium  materials as gas diffusion layers, which have the following functions and advantages. -Uniform porous structure, good gas permeability; -Low resistivity, s...