NaB5C–B5/C Composite Ceramics Prepared by Reaction Sintering in Na Vapor

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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.

Original languageEnglish
Pages (from-to)2422-2427
Number of pages6
JournalJournal of the American Ceramic Society
Issue number7
Publication statusPublished - 2016


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