نتایج جستجو برای: niobium surface preparation
تعداد نتایج: 799254 فیلتر نتایج به سال:
It is well known that intrinsic stress plays an important role in the superconducting material properties of niobium (Nb) thin films and in the resulting electrical characteristics of superconducting-insulating-superconducting (SIS) junctions made from these films. The role of sputtering pressure, gun operating parameters and substrate fixturing on Nb film stress has been investigated by a numb...
In the present study, Thermo-Reactive Deposition method (TRD) in a molten bath was used to form niobium carbide coating on AISI L2 steel. The coating was formed in five different composition of borax (Na2B4O7), boric acid (B2O3), and ferro-niobium. For all of the five compositions of molten bath, niobium carbide coating treatment was carried out at 1173 K, 1273 K, and 1373 K for 2, 4 and 8 hour...
BORON INDUCED SURFACE MODIFICATION OF TRANSITION METALS by Raghasudha Vangaveti Boronizing is a thermo-chemical surface treatment of metals in which boron atoms diffuse into the metal substrate and form hard metallic borides. As a result of boronizing, several properties such as hardness, wear resistance, corrosion resistance, and high temperature oxidation resistance improve which make the met...
Investigations were conducted on low-carbon steel and the steel with same chemical composition with addition of microalloying element niobium. While tensile testing was carried out, the thermographic measurement was tacking place simultaneously. A specific behavior of niobium microalloyed steel was noticed. Test results have shown that, in the elastic deformation region, thermoelastic effect oc...
The quality factor of superconducting radio-frequency niobium cavities decreases with the applied RF field in the medium field range. The medium field Q-slope effect has been investigated by many authors but models, most commonly including thermal feedback, do not fully explain experimental evidence. In this contribution we analyze medium field Q-slope data measured on ISAC-II low beta quarter ...
An apparatus was developed to obtain, for the first time, 2D maps of the surface resistance of the inner surface of an operating superconducting radio-frequency niobium cavity by a low-temperature laser scanning microscopy technique. This allows identifying non-uniformities of the surface resistance with a spatial resolution of about 2.4 mm and surface resistance resolution of ~1 μΩ at 3.3 GHz....
Abstract Niobium’s superconducting properties are affected by the presence and precipitation of impurities in near-surface region. A systematic wide-temperature range x-ray diffraction study is presented addressing effect low temperatures (108 K–130 K) annealing treatments (523 K nitrogen atmosphere, 400 UHV) on region a hydrogen-loaded Nb(100) single-crystal. Under these conditions, response n...
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