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Reactive Hot Pressing of SiC/MoSi 2 Nanocomposites
Author(s) -
Peng Ke,
Yi Maozhong,
Ran Liping,
Ge Yicheng
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01971.x
Subject(s) - materials science , nanocomposite , microstructure , hot pressing , scanning electron microscope , flexural strength , composite material , sintering , transmission electron microscopy , fracture toughness , dispersion (optics) , nanotechnology , physics , optics
Dense SiC/MoSi 2 nanocomposites were fabricated by reactive hot pressing the mixed powders of Mo, Si, and nano‐SiC particles coated homogeneously on the surface of Si powder by polymer processing. Phase composition and microstructure were determined by methods of X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy‐dispersive spectrometry. The nanocomposites obtained consisted of MoSi 2 , β‐SiC, less Mo 5 Si 3 , and SiO 2 . A uniform dispersion of nano‐SiC particles was obtained in the MoSi 2 matrix. The relative densities of the monolithic material and nanocomposite were above 98%. The room‐temperature flexural strength of 15 vol% SiC/MoSi 2 nanocomposite was 610 MPa, which increased 141% compared with that of the monolithic MoSi 2 . The fracture toughness of the nanocomposite exceeded that of pure MoSi 2 , and the 1200°C yield strength measured for the nanocomposite reached 720 MPa.