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

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

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)...

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Bibliographic Details
Published in:Journal of the American Ceramic Society Vol. 99; no. 7; pp. 2422 - 2427
Main Authors: Morito, Haruhiko, Kimura, Takuma, Yamane, Hisanori
Format: Journal Article
Language:English
Published: Columbus Blackwell Publishing Ltd 01-07-2016
Wiley Subscription Services, Inc
Subjects:
Activated sintering
Ball milling
Bend strength
Boron
Bulk density
Carbon
Carbon black
Ceramic powders
Ceramics
Compacts
Composite materials
Grains
Heating
Nanostructure
Sintering
Sodium
Transmission electron microscopy
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Summary: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.
Bibliography:istex:232897BCB8B88BBF6106B6516ED6CB910C1AFCFD
Center for Exploration of New Inorganic Materials, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Japan
ark:/67375/WNG-FGW8KTQ3-T
ArticleID:JACE14204
Fig. S1. Scanning electron micrographs of the B5/C powders (a) without granulation, (b) granulated by repetition of pulverization and formation with the mortar, and (c) mixed and granulated with the ball mill.Fig. S2. Photographs of (a) a compact body of a B5/C powder without granulation and (b) NaB5C ceramics prepared at 1173 K for 24 h in Na vapor.Fig. S3. Photographs of (a) a compact body of a B5/C powder granulated with the ball mill and (b) NaB5C-26% B5/C composite ceramics prepared at 1173 K for 24 h in Na vapor.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14204