Results 141 to 150 of about 4,854 (180)
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AIP Conference Proceedings, 1991
A classical central force field model is applied to a boron carbide lattice assumed to consist of B11C icosahedra and C‐B‐C chains. The icosahedral carbon is positioned in a polar triangle and is puckered inward by ∼10%. Interaction constants are fitted to account for the observed Raman and IR spectral frequencies in terms of q=0 phonons; isotopic ...
Bartram S. Abbott, Charles L. Beckel
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A classical central force field model is applied to a boron carbide lattice assumed to consist of B11C icosahedra and C‐B‐C chains. The icosahedral carbon is positioned in a polar triangle and is puckered inward by ∼10%. Interaction constants are fitted to account for the observed Raman and IR spectral frequencies in terms of q=0 phonons; isotopic ...
Bartram S. Abbott, Charles L. Beckel
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Preparation, microstructure and mechanical properties of SiC–SiC and B4C–B4C laminates
Journal of Solid State Chemistry, 2004Silicon carbide and boron carbide are high hardness materials with a low density but, like most ceramics, with a low toughness, that limits their use in various applications. One approach to reinforce ceramic materials consists in using crack deflection by weakening the interfaces in laminar materials.
S Tariolle +4 more
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Influence of B4C particle size on microstructure and damping capacities of (B4C+Ti)/Mg composites
Journal of Central South University, 2021To study the influence of B4C particle size on the microstructure and damping capacities of (B4C+Ti)/Mg composites, in situ reactive infiltration technique was utilized to prepare Mg-matrix composites. The microstructure, produced phases and damping capacities of the composites prepared with different particle size of B4C were characterized and ...
Yan-tao Yao +2 more
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Journal of Materials Engineering and Performance, 2021
The Al-B4C composites are interestingly used for neutron shielding due to its low weight, high strength, and neutron absorbing. However, during manufacturing process of Al-B4C composites, high content of B4C which leads to aggregation is main problem, as well as the low content resulting in poor neutron absorbing.
Junfeng Zhao, Qiulin Li
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The Al-B4C composites are interestingly used for neutron shielding due to its low weight, high strength, and neutron absorbing. However, during manufacturing process of Al-B4C composites, high content of B4C which leads to aggregation is main problem, as well as the low content resulting in poor neutron absorbing.
Junfeng Zhao, Qiulin Li
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AIP Conference Proceedings, 1991
A self‐consistent‐field, near‐Hartree‐Fock method is applied to study the structure and stability of B4C. Hydrogens serve as bond tie‐offs. Consideration of a large variety of B12C2H16 cluster configurations reveals that one C is highly favored over 0, 2, or 3 in the icosahedron. The C‐B‐C chain is highly favored over all other chains. C’s as far apart
Megan M. Florence, Charles L. Beckel
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A self‐consistent‐field, near‐Hartree‐Fock method is applied to study the structure and stability of B4C. Hydrogens serve as bond tie‐offs. Consideration of a large variety of B12C2H16 cluster configurations reveals that one C is highly favored over 0, 2, or 3 in the icosahedron. The C‐B‐C chain is highly favored over all other chains. C’s as far apart
Megan M. Florence, Charles L. Beckel
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Reaction interaction in Hf–Nb–B4C and Hf–Nb–B4C–C systems
Electrical MetallurgyThe reaction interaction in the Hf–Nb–B4C and Hf–Nb–B4C–C systems has been studied at a temperature of 1750 °C, isotherm times of 30 and 60 min and residual argon pressure of 100 Pa. A different sequence of interactions between the reactants was established.
A.N. Astapov +2 more
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B4C/metal boride composites derived from B4C/metal oxide mixtures
Journal of the European Ceramic Society, 2007Abstract This study examines the reactions occurring from room temperature to 2180 °C during the heating under argon of mixtures of B4C and metal oxides, as well as the properties of the ceramic composites prepared by these reactions. The cations of the oxides investigated, belonged to the transition metal and to the lanthanide groups.
Adrian Goldstein +2 more
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Retention of deuterium implanted into B4C-overlaid isotropic graphites and hot-pressed B4C
Journal of Nuclear Materials, 1992Retention characteristics of two kinds of B4C-overlaid graphites and hot-pressed B4C were investigated. An ion beam of 3 keV D2+ was implanted into the specimens at room temperature. The amount of retained deuteriums was measured as function of the implantation fluence and temperature by elastic recoil detection analysis.
R. Jimbou +5 more
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Influence analysis of B4C content on the neutron shielding performance of B4C/Al
Radiation Physics and Chemistry, 2022Changyuan Li +7 more
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The deposition of boron and B4C
Vacuum, 1952Resume deux methodes de deposition de bore en forme elementaire et en celle de carbure par evaporation dans le vide sont decrites. La matiere est chauffee par le passage de 300 amperes dans un creuset de graphite, formant l'electrode d'un arc. Des couches de 60 μm/cm. 2 de bore elementaire et de 140 μg/cm.
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