Results 111 to 120 of about 276 (148)
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Electrosynthesis of hafnium diboride from cryolite-alumina melts containing hafnium and boron oxides
Russian Journal of Electrochemistry, 2005Electrosynthesis of hafnium diboride from cryolite-alumina melts containing hafnium and boron oxides is studied. Thermodynamic estimation and voltammetric measurements show this process to occur in one-stage. Hafnium diboride coatings on nickel are obtained by electrolysis.
S V Devyatkin
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Structure and composition of hafnium diboride films
Inorganic Materials, 2011 The structure and composition of hafnium diboride films grown by rf magnetron sputtering have been studied by X-ray diffraction and secondary ion mass spectrometry. The results demonstrate that the key parameters of the process are the bias-dependent energy of incident particles and the substrate temperature.
A. A. Goncharov +3 more
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Preparation of hafnium diboride nanopowders in an anhydrous Na2B4O7 ionic melt
Inorganic Materials, 2015Reactions between hafnium powder and microcrystalline boron in a Na2B4O7 ionic melt have been studied at temperatures from 600 to 850°C. The results demonstrate that nanoparticulate hafnium diboride forms starting at 750°C. According to electron microscopy data, the HfB2 powder obtained at 850°C consists of nearly spherical particles 50–55 nm in ...
S E Kravchenko +2 more
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Oxidation behaviour of an aluminium nitride–hafnium diboride ceramic composite
Journal of the European Ceramic Society, 2005Abstract An aluminium nitride–hafnium diboride electroconductive particulate composite was produced via hot isostatic pressing without sintering aids. Oxidation kinetics studies were performed up to 1350 °C under a flow of pure oxygen using a microbalance. The reaction products were analysed using SEM and XRD techniques.
Davide Mattia, Yury Gogotsi
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Microstructural Damage in Hafnium Diboride Under Neutron Irradiation
Key Engineering Materials, 1997Pascale Cheminant +3 more
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Oxidation of ultra-high temperature transition metal diboride ceramics
International Materials Reviews, 2012 The oxidation behaviour of transition metal diboride ceramics is reviewed with emphasis on the performance of zirconium diboride and hafnium diboride. First, the oxidation behaviour of nominally pure diborides is discussed, focusing on the transition to ...
William G Fahrenholtz, Gregory E Hilmas
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Synthesis of Hafnium Diboride Ceramic Powders by Carbothermal Reduction
Glass and Ceramics (English Translation of Steklo I Keramika)N E Shchegoleva +2 more
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Refractory Diborides of Zirconium and Hafnium
Journal of the American Ceramic Society, 2007This paper reviews the crystal chemistry, synthesis, densification, microstructure, mechanical properties, and oxidation behavior of zirconium diboride (ZrB 2 ) and hafnium diboride (HfB 2 ) ceramics.
William G. Fahrenholtz +3 more
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Tribological Behavior of Hafnium Diboride Based Material
Transactions of the Indian Ceramic Society, 2020Tribological behavior of hot pressed HfB2-5%TiSi2 composite was studied under reciprocative sliding condition using cemented tungsten carbide (WC-Co) ball as counter body.
Jitendra Kumar Sonber +3 more
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A new chemresistive NO2 sensing material: Hafnium diboride
Ceramics International, 2022Abstract While metal oxides and metal sulfides have been extensively studied for gas sensing applications, there are no extensive reports on gas sensing properties of metal diborides. Here, for the first time, we have investigated the conductometric gas sensing behavior of HfB2 nanoparticles. The HfB2 nanoparticles is synthesized via a sol-gel method
Sikai Zhao +8 more
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