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Influence of Strong Fiber/Coating Interfaces on the Mechanical Behavior and Lifetime of Hi‐Nicalon/(PyC/SiC) n /SiC Minicomposites
Author(s) -
Bertrand Sebastien,
Pailler Rene,
Lamon Jacques
Publication year - 2001
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.1151-2916.2001.tb00742.x
Subject(s) - materials science , composite material , silicon carbide , micromechanics , microstructure , chemical vapor infiltration , interphase , coating , ultimate tensile strength , fiber , composite number , biology , genetics
Hi‐Nicalon fiber‐reinforced silicon carbide matrix minicomposites (Hi‐Nicalon/SiC) with nanoscale multilayered (PyC/SiC) n fiber coatings (also referred to as interphases) have been manufactured via pressure pulse chemical vapor infiltration (P‐CVI). Fiber/coating interfaces were strengthened by using treated fibers. The microstructures of the interphases as well as the propagation and deflection of cracks in the interfacial region were investigated by SEM and TEM. Interfacial shear stress was estimated using various methods based on either the width of hysteresis loops on unloading–reloading, crack spacing, or fitting of the force–deformation curve using a micromechanics‐based model. Tensile behavior at room temperature and lifetime in static fatigue in air at 700°C were related to the interphase/interface characteristics.