نتایج جستجو برای: surface alloying
تعداد نتایج: 639565 فیلتر نتایج به سال:
A method to produce nanoscale films of AuAlx and PtAlx, and their mesoporous elemental derivatives is described, and the morphology and optical properties of these coatings explored. The color of the AuAlx film is bright purple, in agreement with ab initio calculations and experimental observations for the compound AuAl2, but becomes black after de-alloying with NaOH. The film of PtAlx is silve...
The task of wear resistance improvement for bearing steels working at high loads in water medium was solved by laser alloying with Sn. The modified zone contains up t o 22 wt.% Sn, which is used as a solid lubricant during exploitation. As a result the bearing race's durability is increased 2.5 times. The combination of laser alloying from a nitrogen jet with surface plastic deformation (SPD) w...
Pd-Au bimetallic model catalysts, synthesized either as thin films on Mo(110) or as nanoparticles on a TiO2 thin film, were used in CO oxidation at both low (1 × 10-7 Torr) and elevated (8-16 Torr) CO pressures. Alloying with Au forms isolated Pd sites that are incapable of dissociating O2. This inability causes reactivity loss at low reactant pressures. Moreover, alloying also electronically m...
Motivated by recent STM results for Cr on Fe(001) we present a detailed ab-initio study of the alloying process in the dilute limit for 3d atoms on the Fe(001) surface. The calculations are based on local density functional theory and apply a KKR{Green's function method for impurities on surfaces. For practically all 3d transition metal impurities on Fe(001) we nd a strong tendency for a direct...
Plasma Surface Metallurgy /Alloying is a kind of surface metallurgy/alloying to employ low temperature plasma produced by glow discharge diffuse alloying elements into the substrate material form an alloy layer. It different with ion nitriding technology, which only applicable infiltration non-metallic elements. “Double Glow Technology”, also known as “Xu-Tec Process” can utilize any chemical i...
Understanding of the atomic-scale structure is essential for exploiting the unique catalytic properties of any nanoalloy catalyst. This report describes novel findings of an investigation of the nanoscale alloying of gold−copper (AuCu) nanoparticles and its impact on the surface catalytic functions. Two pathways have been explored for the formation of AuCu nanoparticles of different composition...
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