Premium
Strength, Structure, and Fracture Properties of Ceramic Fibers Produced from Polymeric Precursors: I, Base‐Line Studies
Author(s) -
SAWYER LINDA C.,
JAMIESON MARJORIE,
BRIKOWSKI DUANE,
HAIDER M. ISHAQ,
CHEN RONG T.
Publication year - 1987
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.1151-2916.1987.tb05631.x
Subject(s) - fractography , materials science , composite material , ceramic , microstructure , brittleness , ultimate tensile strength , fiber , fracture (geology) , microcrystalline , crystallography , chemistry
Classical brittle failure has been observed for ceramic fibers produced by pyrolysis from three different polymer precursors. Characterization by SEM fractography methods has shown typical flaw‐mirror‐mist‐hackle morphology and such study has provided observations for understanding the fracture mechanisms. The gage length dependence of tensile strength combined with the fractography study showed the flaw‐controlled failure mechanism of all the ceramic fibers. Systematic failure types have been identified for specific strength ranges. Complementary study of the microstructure and chemical structure by TEM, X‐ray diffraction, and electron spectroscopy for chemical analysis (ESCA) has shown the nature of the bulk ceramic to be predominantly random and glassy even in the case of a fiber with microcrystalline β‐SiC. Fracture mechanics calculations have shown the fibers all behave as glasses.