Results 121 to 130 of about 276 (148)
Some of the next articles are maybe not open access.
Heteroepitaxy of Hafnium Diboride on a Hafnium(0001) Single Crystal Surface
Chemistry of Materials, 1997A novel heteroepitaxial structure is formed between the metallic hard material hafnium diboride and a hafnium single-crystal substrate. The film is formed by chemical vapor deposition of boron at 750 °C using diborane gas and is characterized with X-ray photoelectron spectroscopy, low-energy electron diffraction, and X-ray diffraction.
Michael Belyansky, Michael Trenary
openaire +1 more source
Hafnium oxide coating to improve the oxidation behavior of Zirconium Diboride
Journal of the European Ceramic SocietyHafnium dioxide (HfO2) coatings were successfully deposited on zirconium diboride (ZrB2) using reactive magnetron sputtering. After the oxidation at 1500°C or 1600°C, the mutual dissolution of HfO2 and thermally grown ZrO2 was observed which has resulted
Förster, Jan Erik +3 more
openaire +4 more sources
Solid-State Synthesis and Characterization of Hafnium Diboride Nanoparticles
Journal of Superhard Materials, 2020Hafnium diboride (HfB2) nanoparticles have been prepared by a solid-state reaction of hafnium dioxide (HfO2), metallic magnesium (Mg) and sodium borohydride (NaBH4) at 700°C in an autoclave. The structure and morphology of the obtained product are investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and scanning ...
null Liangbiao Wang +9 more
openaire +1 more source
The energy landscape of glassy dynamics on the amorphous hafnium diboride surface
The Journal of Chemical Physics, 2014Direct visualization of the dynamics of structural glasses and amorphous solids on the sub-nanometer scale provides rich information unavailable from bulk or conventional single molecule techniques. We study the surface of hafnium diboride, a conductive ultrahigh temperature ceramic material that can be grown in amorphous films.
Duc, Nguyen +6 more
openaire +2 more sources
Thermodynamic characteristics of hafnium and tantalum diboride in a wide temperature range
Soviet Powder Metallurgy and Metal Ceramics (English Translation of Poroshkovaya Metallurgiya), 1989A V Blinder
exaly +2 more sources
Transactions of the Kоla Science Centre of RAS. Series: Engineering Sciences, 2023
The effect of calcium hexaboride on the interaction of HfB2 and TaB2 with iridium was studied as a function of temperature and the ratio of initial reagents. It is shown that the replacement of half of the transition metal diboride by CaB6, as well as an increase in temperature, lead to a significant change in the phase composition of the products.
Victor V. Lozanov, Natalia I. Baklanova
openaire +1 more source
The effect of calcium hexaboride on the interaction of HfB2 and TaB2 with iridium was studied as a function of temperature and the ratio of initial reagents. It is shown that the replacement of half of the transition metal diboride by CaB6, as well as an increase in temperature, lead to a significant change in the phase composition of the products.
Victor V. Lozanov, Natalia I. Baklanova
openaire +1 more source
On the borothermic preparation of titanium, zirconium and hafnium diborides
Journal of the Less Common Metals, 1968Abstract The formation of titanium, zirconium and hafnium diborides by reaction between metal dioxides and elemental boron in vacuum in the temperature range 1000 °–1750 °C has been investigated. It has been established that titanium diboride with a composition close to that of stoichiometric TiB2 is obtained after a heattreatment of the reactants at
P. Peshev, G. Bliznakov
openaire +1 more source
Nanoscratch and nanofriction behavior of hafnium diboride thin films
Wear, 2008Abstract Hafnium diboride (HfB 2 ) offers an excellent combination of high bulk hardness (29 GPa), high melting point (3295 °C) and high wear resistance, thus making it an attractive material for wear resistant coatings. In this work, the nanoscale friction response of as-deposited and annealed HfB 2 films is reported.
Abhishek Chatterjee +4 more
openaire +1 more source
Microstructure and nanohardness of hafnium diboride after ion irradiations
Journal of Nuclear Materials, 1998Abstract In order to simulate helium and lithium appearance originating from the 10B (n,α)7Li reaction, that occurs under neutron irradiation in a PWR, hafnium diboride samples have been irradiated with He+ and Li+ ions at 350°C. As implanted and annealed materials have been characterised by TEM observations and nanohardness measurements. In spite of
P. Cheminant-Coatanlem +3 more
openaire +1 more source
Growth kinetics and properties of nanostructured hafnium diboride films
Technical Physics, 2009The composition, structure, substructure, and physicomechanical properties of hafnium diboride films deposited by nonreactive rf magnetron sputtering are studied by X-ray diffraction (including photographic recording) and electron microscopy. The results obtained are analyzed, and the film growth kinetics is revealed.
V. A. Konovalov, D. N. Terpiy
openaire +1 more source