NaB5C–B5/C Composite Ceramics Prepared by Reaction Sintering in Na Vapor |
| |
| Authors: | Haruhiko Morito Takuma Kimura Hisanori Yamane |
| |
| Affiliation: | Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan |
| |
| Abstract: | Reaction sintering of sodium carbaboride (NaB5C) was performed by heating compacts of mixtures of amorphous boron (B) and carbon black (C) powders (B/C molar ratio, 5/1) at 1173 K in Na vapor. The ceramics obtained from the compacts of B5/C powder mixed with a ball mill (compact density, 1.67 Mg/m3) were the composites of NaB5C (74 mass%) and unreacted B5/C (26 mass%). The bulk density and bending strength of the composite ceramics were 2.04 ± 0.03 Mg/m3 and 320.9 ± 10.4 MPa, respectively. Transmission electron microscope observation revealed that nanometer‐size amorphous grains of B or C were included in the matrix of NaB5C. |
| |
| Keywords: | |
|
|
