Abstract— This article investigates the main tribotechnical properties of high borides of rare-earth metals with a UB12-type structure. The experiments have demonstrated that ZrB12, DyB12, and TmB12 dodecaborides during friction are characterized by a rather low weight wear of 10–3 mg/m, coefficient of friction f = 0.2–0.5 and are highly wear-resistant materials, …
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In the current study, the rare earth oxides added to nickel-based alloys are mainly Y 2 O 3, La 2 O 3, CeO 2, etc. Due to their similar atomic structure and similar ionic radius, they have many similarities in enhancing nickel-based alloys. 138 However, although rare earth elements have similar atomic structures and similar ionic radii, their ...
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Compared with undoped ones, the relative wear resistance of doped rare earth elements was higher, and the wear weight loss was lower. The WC particles on the wear surface of the composites after doping with rare earths and their surrounding interfaces after rare earth doping have the characteristics of WC particle spalling, grooves and pits to ...
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1. Introduction. The interest in rare Earth elements observed in recent years is driven by rising application opportunities provided by new electronic technologies and nanotechnologies [1,2,3,4].In addition to these specialized areas of the economy, rare Earth metals (REM) are still used in the metallurgical, chemical, and metal industries.
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Tailoring the alloy composition, which induces the hard secondary phase to increase hardness and strength to improve the wear features, is a feasible approach for developing wear-resistant metal materials. Here, a group of (AlCoCrFeNi)100–xScx (x = 0–2.0, at%) high-entropy alloys (HEAs) are designed and the phase compositions and wear …
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The rare earth elements (REE) are a set of seventeen metallic elements. These include the fifteen lanthanides on the periodic table plus scandium and yttrium. Rare earth elements are an essential part of many high-tech devices. The …
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A schematic diagram of the obtained rare earth compounds in a practical smelting operation indicates the generation order of rare earth sulfur oxides and sulfides in production, that is, first to be generated is Ce 2 O 2 S, and then the rare earth sulfides, which indicates that the thermodynamic calculation and the actual situation are consistent. CeO 2 has been found in …
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In this work, effects of rare earth elements on microstructure evolution and wear properties of TiB 2 reinforced aluminum matrix composite coatings were investigated by the …
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As many of the big-name carmakers begin switching from gasoline-powered vehicles to those that run on electric motors, the issue of rare earth metals has taken on added urgency—China produces approximately 90 …
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1. THE RARE EARTH ELEMENTS. Figure 1. Periodic Table of the Elements. In the periodic table of the elements, rare earth elements (REEs) are the group of elements in the row labelled "lanthanides" and are highlighted in blue, but also include yttrium (Y) and scandium (Sc) because these elements possess similar chemical characteristics.. 1.1 Natural …
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The comprehensive properties of alloys and composites are significantly improved by the addition of rare earth (RE) elements. ... welding performance [25], wear resistance [26], fatigue properties [27, 28] and corrosion resistance [29], [30 ... The fatigue life is greatly improved by only parts-per-million-level RE addition in 52100 ...
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Rare-earth elements (REEs) are used in the components of many devices used daily in our modern society, such as: the screens of smart phones, computers, and flat panel televisions; the motors of computer drives; batteries of hybrid and electric cars; and new generation light bulbs.
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In real life here on Earth, a group of natural metals known as the rare earths has made possible our own technology-powered society. Demand for these crucial components in nearly all modern...
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The results show that the wear surface of the specimens without rare earth oxide shows flaking pits, obvious abrasion marks, and many abrasive debris, and the wear mode is mainly adhesive wear. However, the wear surface of most of the specimens with lanthanum/cerium oxides is relatively flat.
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The results show that the wear surface of the specimens without rare earth oxide shows flaking pits, obvious abrasion marks, and many abrasive debris, and the wear mode is mainly adhesive wear. However, the wear …
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This article summarizes the occurrence of these metals in the Earth's crust, their mineralogy, different types of deposits both on land and oceans from the standpoint of the new data with more examples from the Indian subcontinent.
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The rare earth elements (REEs) are comprised of the lanthanide elements plus scandium and yttrium, which have similar physical properties and are often found in the same ores and deposits.
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Some academics have proposed mixing rare earth elements (REEs) in raw material powders to solve the issue of property anisotropy caused by microstructure in metal additive manufacturing (MAM).
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Owing to their physical and chemical properties, such as special electron structure, good chemical activity, and large ion radius [29], rare earth (RE) are called vitamins out of metals [30], successfully applied in many fields including metallurgy, electronics, and chemical engineering.In recent years, RE and REO have been gradually introduced into the laser …
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This article summarizes the occurrence of these metals in the Earth's crust, their mineralogy, different types of deposits both on land and oceans from the standpoint of the new …
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In real life here on Earth, a group of natural metals known as the rare earths has made possible our own technology-powered society. Demand for these crucial components in nearly all modern...
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WHAT ARE RARE EARTH ELEMENTS? Rare earths are 17 chemical elements with special magnetic properties. They are pervasive across modern life and are particularly coveted for their ability to produce the world's strongest and most efficient magnets. These magnets are what enable electric motors transform energy into motion, and generators to ...
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The rare earth elements (REEs) are 17 metals in Group 3 of the Periodic Table comprising Lanthanide series elements and Scandium and Yttrium (due to similar physical properties and found in the same ores and deposits). Contrary to their name, they are moderately abundant in nature but not concentrated enough to make them economically exploitable.
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In this work, effects of rare earth elements on microstructure evolution and wear properties of TiB 2 reinforced aluminum matrix composite coatings were investigated by the combination of first principles calculations and experimental investigation. The calculated results revealed that Sc exhibited the most effective modification ability due to the most negative …
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In this work, effects of rare earth elements on microstructure evolution and wear properties of TiB 2 reinforced aluminum matrix composite coatings were investigated by the combination of first principles calculations and experimental investigation.
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Innovators at NASA's Glenn Research Center have developed a technique using rare earth elements to fabricate a dual-phase ceramic composite that combines a wear-resistant phase and a solid-state lubricant phase.
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While the importance of rare earth metals is widely acknowledged in manufacturing sophisticated devices for use in space, defense, clean, green and consumer technologies, the increasingly innovative and effective roles REE are playing in the development of new medicines and medical technologies get little public attention. New developments in medic...
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WHAT ARE RARE EARTH ELEMENTS? Rare earths are 17 chemical elements with special magnetic properties. They are pervasive across modern life and are particularly coveted for their ability to produce the world's strongest and most efficient magnets. These magnets are what …
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Especially when rare earth (RE) elements are added as major alloying elements to Mg alloys, the alloy strength and creep resistance are greatly improved, which have promoted several series of Mg-RE alloys. This paper reviews the progress and developments of high-performance Mg-RE alloys in recent years with emphasis on cast alloys.
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Some academics have proposed mixing rare earth elements (REEs) in raw material powders to solve the issue of property anisotropy caused by microstructure in metal …
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