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Mechanical Behavior and High‐Temperature Performance of a Woven Nicalon™/Si‐N‐C Ceramic‐Matrix Composite
Author(s) -
Lee S. Steven,
Zawada Larry P.,
Staehler James M.,
Folsom Craig A.
Publication year - 1998
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.1151-2916.1998.tb02550.x
Subject(s) - materials science , composite material , ceramic matrix composite , ultimate tensile strength , composite number , ceramic , stress (linguistics) , tension (geology) , fatigue limit , carbon fibers , degradation (telecommunications) , cyclic stress , telecommunications , philosophy , linguistics , computer science
A modern ceramic‐matrix composite (CMC) has been extensively characterized for a high‐temperature aerospace turbine‐engine application. The CMC system has a silicon‐nitrogen‐carbon (Si‐N‐C) matrix reinforced with Nicalon fibers woven in a balanced eight‐harness satin weave fabric. Tensile tests have demonstrated that this CMC exhibits excellent strength retention up to 1100°C. The room‐temperature fatigue limit was 160 MPa, ∼80% of the room‐temperature tensile strength. The composite reached run‐out conditions under cyclic (10 5 cycles at 1 Hz) and sustained tension (100 h) conditions at a stress of 110 MPa, which was ∼35 MPa above the proportional limits at temperatures up to 1100°C in air. At stress levels >110 MPa, cyclic loading at 1000°C caused a more severe reduction in life, based on time, compared with sustained tension. Further life degradation was observed in the 1000°C fatigue specimens that were exposed to a salt‐fog environment. This degradation decreased the fatigue life ∼85% at the stress levels that were tested.