The work reports the low-temperature green synthesis of hafnium carbide (HfC) using rice flour as a natural carbon precursor and its potential in heat transfer nanofluids by studying the concentration-dependent thermal diffusivity. The structure characterisations confirm the formation of HfC, whose ...
a 532-nm line of an argon-ion laser was used at a power level of 0.6 mW. The Raman spectroscopy was used to probe the local bonding structure of the catalysts and to examine the influence of electrochemical testing on catalyst structure. Since the N-modified HfOxthin film was supported...
Hafnium dioxide may be prepared by heating the metal with air or oxygen at elevated temperatures (above 400°C). Also, the oxide can be obtained by igniting hafnium salts, such as hydroxide, oxalate, sulfate, nitride, carbide, boride or tetrachloride in air. Hafnium carbide converts to dioxid...
摘要: zirconium tetrachloride;hafnium tetrachloride;chlorination;zirconium carbide;calcium chloride 关键词: zirconium tetrachloride hafnium tetrachloride chlorination zirconium carbide calcium chloride 出版时间: 2007/01/05 ISBN: 9780470131633 被引量: 10
S. Shimada and M. Inagaki: Oxidation kinetics of hafnium carbide in the temperature range of 480 °C to 600 °C. J. Am. Ceram. Soc. 75, 2671 (1992).Shimada S,Inagaki M,Matsui K.Oxidation kinetics of hafnium carbide in the temperature range 480 to 600℃.Journal of the American ...
Energy Dispersive Spectrum, Scanning Electron Microscopy, X-Ray Diffraction and Raman spectroscopy were employeed to investigate the damage behaviors of the material. The results show that HfC was oxided by AO preferentially, while HfO2 and graphite films were its main products during AO exposure. ...
Nanostructured carbide-derived carbons (CDC) were synthesized from Ta4HfC5 and WTiC2 powders via gas phase chlorination within the temperature range from 800 to 1100掳C. The results of X-ray diffraction, high-resolution transmission electron microscopy and Raman spectroscopy showed that the synthesized...
Raman spectrometrycarbide coatingIn the present work we investigated the atomization mechanisms of indium in electrothermal atomic absorption spectrometry with pyrolytically coated graphite (PG) and non-pyrolytically coated graphite (NPG) furnaces treated with a refractory element, such as Hf, Ti, W or...
Polycarbosilane (PCS) has Si-C backbone structures and can be converted to silicon carbide. In the PDCs method, residual or excess carbon is generated from the precursor (C/Si ratio = 2 for polycarbosilane). Because of the non-stoichiometry of SiC, the physicochemical properties of polymer-...
The effects of oxide, hydride and carbide formation, as well as the changes in surface area, surface atomic geometry and surface composition as a result of metal and oxide mobility and reactivity have been investigated.doi:10.1016/0167-2738(89)90378-0David L. Cocke...