قائمة الطعام
As one kind of rare earth element, Ce possessed high surface activity, which effectively interrupted the grain growth and caused the formation of stable intermetallics, thus contributing to grain refinement strengthening and precipitate strengthening. ... Significance of stable and metastable phases in high temperature creep resistant …
Inclusions modification in heat resistant steel containing rare earth elements. Ironmak Steelmak, 45 (1) (2016), p. 76. View PDF View article CrossRef Google Scholar. 82. Y. Wang, C. Liu. Agglomeration characteristics of various oxide inclusions in molten steel containing rare earth element under different deoxidation conditions.
Rare earth alloy wear-resistant pipe is produced by horizontal centrifugal casting, in which the smelted liquid metal is passed through the pouring riser and diverted into the rotating mold barrel (the speed of the mold barrel is generally 800-1000 rpm), under the action of centrifugal force A casting method for filling and solidifying into a ...
Microstructure, mechanical properties and phase transformation of a heat-resistant rare-earth (RE) Mg-16.1Gd-3.5Nd-0.38Zn-0.26Zr-0.15Y (wt.%) alloy were …
Rare earth elements in biodegradable metals can refine grains, combine with impurity elements to reduce defects, form intermediate phases, reduce galvanic corrosion, form dense oxide film, and increase corrosion resistant [ 15, 16 ]. Furthermore, most rare earth elements do not show unsuitable biocompatibility. 2.
Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review. by Laihao Yu, Yingyi Zhang *, Tao Fu, Jie Wang, Kunkun Cui and …
Trivalent rare earth ions (Ln 3+) have the unique electronic configurations [Xe]4f n ( n = 0–14) and numerous energy levels, which endow rare earth luminescent …
High temperature oxidation experiment showed that rare earth element Ce played a very good antioxidant effect with the increasing oxidation temperature. After continuous oxidation at 600 °C, 700 ...
Most wind turbines use neodymium–iron–boron magnets, which contain the rare earth elements neodymium and praseodymium to strengthen them, and dysprosium …
The results show that the rare earth passivation can enhance the corrosion resistance of Zn coated NdFeB magnets. When the concentration of cerium nitrate is 5 g/L, the passivated specimens can achieve the longest NSS time of 360 h, which is 144 h longer than that of the pristine Zn/NdFeB magnets. The passivation layer on the Zn coating …
NdFeB rare earth magnets are not resistant to corrosion. As a result, they require plating. Additionally, when exposed to moisture, the chance of oxidation remains high. High Cost Magnets. There are …
Stacking faults cannot be fully eliminated from yttrium partially stabilized zirconia (YSZ) ceramic coatings.However, their influence on the corrosion resistance of YSZ ceramics has remained unclear up till now. In this study, the impact of stacking faults on the corrosion resistance of YSZ with or without Nd dopant in CaO, MgO, Al 2 O 3 …
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.Rare earth wear-resistant pipe is a method of casting as a whole in the parts with serious wear, such as elbows, reducers, water suction ports, etc., and then performing machining, especially in the parts where the wear is …
It has also been reported that the addition of rare earth metals to stainless steels can considerably suppress the formation of sulfides and oxides [28]. Recently, several studies have shown that rare earth modifying inclusions improved the corrosion resistance of pitting for duplex stainless steels [28], [29], [30].
The effects of different rare earth elements on the microstructure, mechanical properties and wear resistance of WC/steel matrix composites were investigated in detail. The composite were successfully prepared through powder metallurgy vacuum sintering process, and the microstructures of different rare earth types were …
Studies have shown that the nanoscale rare earths are superior to micron rare earth particles in both mechanical property and shielding property, which shall be …
The wear resistance of doped rare earth Y was higher than that of the undoped sample, which was closely related to the improvement of hardness distribution, strength and strain of rare earth elements. CRediT authorship contribution statement. Fei Zhang: Methodology, Investigation, Writing-original draf. Wei Zhao: Investigation, …
1. Introduction. High carbon chromium bearing steel has been widely used in the manufacture of the bearing ring and rolling elements due to its high level of hardness and strength [1], [2], good wear resistance [3], [4], and dimensional stability [5], [6], ever since its development in 1905 [7].As a representative steel of high carbon chromium …
The introduction of rare-earth Y 2 O 3 improved the bonding strength of MY coating to varying degrees, wherein the MY20 coating exhibited the highest adhesion strength among all the coatings. Similarly, Y 2 O 3 addition also enhanced the oxidation resistance of MY coating at 1700 °C, and the MY20 coating possessed the best …
Keywords: rare earths; rare earth application; mechanism; heat resistant steel A number of studies [1–5] have shown that rare earth in steels could play the roles of effectively modifying inclu- sions, deep purifying liquid steel, grain refinement and mi- …
Rare earth silicate environmental barrier coatings (EBCs) are state of the art for protecting SiC ceramic matrix composites (CMCs) against corrosive media. The interaction of four pure rare earth silicate EBC materials Yb 2 SiO 5, Yb 2 Si 2 O 7, Y 2 SiO 5, Y 2 Si 2 O 7 and three ytterbium silicate mixtures with molten calcium …
The effects of the rare earth on the occurrence state of the inclusions, microstructure, mechanical properties and wear resistance of the steel were studied by means of optical microscope (OM), scanning …
Therefore, the oxidation resistance of the superalloy at the temperatures above 1 000 °C is expected to be improved. It was reported that the rare earth (RE) elements, such as La, Y, Ce, and their oxides can be used for reducing the oxidation rate of the superalloys [5]. The effect is called reactive-element effect (REE) which have been ...
The new high strength low alloy rare earth wear resistant steel pipe is developed according to this principle, and the components are various alloying elements such as Cr, Ni, V, Mo, W, and Cu. Rare earth alloy wear – resistant tube is badly worn parts, such as pipe, elbow, reducer, and water intake place such as the model of integral casting ...
Rare earth (RE) elements are excellent modifiers for non-metallic inclusions that inevitably appear in steel and affect steel properties. This paper reviews the research status of inclusions modification by RE elements and the changes it cause on steel properties. First, the inclusion changes caused by RE modification are described.
Nature Materials - The variation in the properties of rare earth (RE) steels is shown to stem from the presence of oxygen-based inclusions, and only under very-low-oxygen conditions can RE...
Rare-earth silicates are potential candidates for high-temperature protective coatings on hot end parts of the engine [16] [17] [18], owning to their low thermal conductivity and excellent ...
The oxidation resistance of the steel was improved by adding a single rare earth element Y or Ce, particularly element Y. Notably, the alloy with both rare earth elements Y and Ce did not exhibit a good oxidation resistance for its loose oxide film, as shown in Fig. 10 (d). An internal oxidation zone appeared deep into the matrix.
Single-phase Mg-based supersaturated solid solution is expected to possess high corrosion resistance. In this work, rare earth scandium (Sc) was used as alloying element to prepare Mg (Sc) solid solution powder by mechanical alloying (MA) and then shaped into implant using selective laser melting (SLM). MA utilizes powerful …
Rare-earth elements (hereinafter referred to as REE) are a group of seventeen chemical elements in the periodic table, in particular the fifteen lanthanides as well as …
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