Density functional theory is demonstrated to reproduce the 13C and 11B NMR chemical shifts of icosahedral boron carbides with sufficient accuracy to extract previously unresolved structural information from experimental NMR spectra. B4C can be viewed as an arrangement of 3-atom linear chains and 12-atom icosahedra. According to our results, all the chains have a CBC structure. Most of the icosa...

Boron carbon nitride ~BCN! films have been grown by B4C evaporation with concurrent N2 1 ion assistance, and have been characterized by x-ray absorption near edge ~XANES! spectroscopy. Upon the nitrogen insertion, the film structure evolves from BxC-like to h-BN-like. The hexagonal structure corresponds to a true ternary BCN compound that can be understood as h-BN with carbon incorporated in su...

In situ monitoring of the transformation of B4C under electric field using Raman spectroscopy is reported. Application of electric fields up to 5000 V/cm leads to local segregation of carbon, indicated by the appearance of Raman D and G peaks. At low electric fields (o3000 V/cm) the segregated carbon is amorphous, while at higher fields aromatic sp clustering is observed. Electrical measurement...

Hybrid nanofluids aim to further improve the characteristics of mono nanofluids. However, experimental studies that jointly explore physical properties hybrids and corresponding are missing. In this work, B4C TiB2 hybrid TiB2:B4C nanoadditives used for first time design based on propylene glycol:water 20:80 wt%. The density, isobaric heat capacity, thermal conductivity determined by oscillating...

TiB2-SiC-C and TiB2-TiC-C heteromodulus ceramics were sintered by reactive hot pressing of TiC-B4C-Si TiC-B4C precursors at 1830 °C 30 MPa. Sintering time the maximum temperature was between 2 8 min. The reactions in green body create submicron (100–400 nm) TiB2 crystals inside silicon carbide grains as well BxSiyCz nanofibers, which nucleate near SiC surfaces. Low hardness graphite platelets a...

The microstructure and mechanical properties of an MMC based on AA 7075 strengthened through silicon carbide (SiC) as well boron (B4C) elements were studied. (SiC + B4C) combination was used in various weight percentages 4, 8, 12, 16% to create the hybrid composites utilizing traditional stir casting procedure. XRD SEM measurements investigate dispersion reinforced particles. For example, micro...

To improve the mechanical properties and tribological characteristics of boron carbide (B4C) ceramic, silicon (SiC) as an incorporation phase was added into matrix. The result...