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The Study on Carbon Nanofiber (CNF)‐Dispersed B 4 C Composites
Author(s) -
Hirota Ken,
Nakayama Yoshihiro,
Kato Masaki,
Nakane Shingo,
Nishimura Toshiyuki
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02323.x
Subject(s) - materials science , composite material , carbon nanofiber , fracture toughness , sintering , microstructure , vickers hardness test , composite number , transmission electron microscopy , nanofiber , scanning electron microscope , carbon fibers , carbon nanotube , nanotechnology
Carbon nanofiber (CNF)‐dispersed B 4 C composites have been synthesized and consolidated directly from mixtures of elemental raw powders by pulsed electric current pressure sintering (1800°C/10 min/30 MPa). A 15 vol% CNF/B 4 C composite with ∼99% of dense homogeneous microstructures (∼0.40 μm grains) revealed excellent mechanical properties at room temperature and high temperatures: a high bending strength (σ b ) of ∼710 MPa, a Vickers hardness ( H v ) of ∼36 GPa, a fracture toughness ( K I C ) of ∼7.9 MPa m 1/2 , and high‐temperature σ b of 590 MPa at 1600°C in N 2 . Interfaces between the CNF and the B 4 C matrix were investigated using high‐resolution transmission electron microscopy, EDS, and electron energy‐loss spectroscopy.