Nanostructure of Dispersed and Compact Nonstoichiometric Vanadium Carbide |
| |
Authors: | Gusev A I Tulin A A Lipatnikov V N Rempel' A A |
| |
Institution: | (1) Institute of Chemistry of Solids, Ural Division, Russian Academy of Sciences, Yekaterinburg, Russia |
| |
Abstract: | Structure and properties of dispersed and compact nanocrystalline vanadium carbide VC0.875 were studied. Dispersed vanadium nanocarbide was prepared by prolonged aging of a coarse-grained VC0.875 powder. It has a unique nanostructure: nanocrystallites of dispersed vanadium carbide have a shape of bent lobes up to 600 nm in diameter and 15-20 nm thick. Annealing and quenching of compact samples of coarsegrained VC0.875 carbide result in the formation of a nanodomain structure. The nanostructured carbide VC0.875 corresponds in composition to the higher boundary of a homogeneity area of a cubic phase and mainly contains ordered V8C7 phase, which belongs to the P4332 space group. Cold pressing and subsequent vacuum sintering of vanadium carbide nanopowder at 2000 K gave sintered samples approaching diamond in microhardness. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |