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Showing 1 to 12 of 12 for “"hafnium diboride"”.
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Processing and characterization of boron carbide-hafnium diboride ceramics
<p>"Hafnium diboride based ceramics are promising candidate materials for advanced aerospace and nuclear reactor components. The effectiveness of boron carbide and carbon as HfB₂ sintering additives was systematically evaluated. In the first stage of the research, boron carbide and carbon additives …
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Tribological Behavior of Cvd-Grown Hafnium Diboride Thin Films From Macro to Nano-Length Scales
Made available in DSpace on 2015-09-25T20:53:10Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3337722.pdf: 3158668 bytes, checksum: 49752af5170943f48ee6443a1fd3ecd3 (MD5) Previous issue date: 2008
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Synthesis and indentation of boride and carbide coated carbon nanotube composite microstructures
… coated using two methods: (i) static CVD with a hafnium diboride precursor (Hf[BH4]4) leading to coating thicknesses ranging from 3nm to 50 nm; and (ii) through cycles of elasto-capillary imbibition and pyrolysis of a silicon oxycarbide (SiOC) polymer derived ceramic leading to coating thickness …
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Ultraconformal chemical vapor deposition and synthesis of transition metal nitride films
… stoichiometric and pure metallic films of hafnium diboride and iron in high AR features. By achieving high precursor pressure, growth rate saturation is maintained deeply into structures. CVD has a growth rate advantage over atomic layer deposition in high AR features. SCVD is highly …
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Reaction Synthesis of HfB2 in a Variety of Metallic Environments
… project investigated the reactive formation of hafnium diboride (HfB2) in a variety of metallic environments, including blends with Bi, Cu, Ni, and Sb. HfB2 has garnered interest for a variety of applications due to its hardness, stability at elevated temperatures, as well as electrical and …
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Performance Engineering of Reactive Molecular Dynamics Simulations
… with twice as many OpenMP threads on a 1152-atom Hafnium Diboride simulation. I show performance improvements on various simulation sizes up to 44K atoms, and present independently verified correctness on an AMD Ryzen Threadripper 3970X.
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Scanning tunneling microscopy studies of fluorinated graphene films and field-directed sputter sharpening
… materials, including the hard metallic-ceramic hafnium diboride (HfB2). Finally, we explore the use of HfB2-coated W wires for STM imaging and spectroscopy.
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Scanning tunneling microscopy characterization and metallic nanocontacts for atomically precise graphene nanoribbons
… We also proposed a scheme of writing metallic hafnium diboride nanocontacts onto isolated GNRs using STM tip-assisted deposition for conducting transport measurements. In order to perform transport measurement in situ through sample biasing, we prefabricated an array of large metallic …
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Tribological studies of micro/nanoscale thin solid films
… were obtained. Fifth, the yielding behavior of hafnium diboride (HfB2) hard coatings was studied showing that plastic deformation at the interface was the dominant failure mechanism of the HfB2 films.
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Molecularly thin rheological and contact interfaces
… is the work on nano-tribological behavior of Hafnium-Diboride thin films. Dense, hard nanocrystalline films of HfBN and multilayer ones of HfB2/HfBN compositions having thickness in the range of 100-600 nm were deposited using chemical vapor deposition (CVD) technique. The roughness values of …
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Volatile metal borohydride complexes: synthesis and characterization of new chemical vapor deposition precursors
… used to deposit conformal thin films of hafnium diboride, HfB2, and iron metal from hafnium borohydride, Hf(BH4)4, and iron pentacarbonyl, Fe(CO)5, respectively. Microtrenches with aspect ratios greater than 10:1 were able to be completely infilled with HfB2 or iron and macrotrenches were …
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Scanning tunneling microscopy and spectroscopy of metallic features and nanocontacts for atomically precise graphene nanoribbons on silicon surface
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01