Abstract
The effect of thermal exposure on the microstructure and tensile stress-strain behaviour has been investigated for composites of woven continuous oxide fibres (Nextel 720) in a porous aluminosilicate matrix. The tensile tests were carried out on straight-sided, centre hole notched plates with 0/90° and ±45° orientations. The as-received material was slightly notch sensitive in that the net section fracture stress decreased somewhat with increasing hole diameter but much less than predicted for an ideally elastic, fully notch-sensitive material. After exposure at 1100°C and for long time at 1000°C in air the composite was embrittled. In the 0/90 composite this resulted in a reduced fracture strength, a reduced strain to failure as well as a reduced fracture toughness and damage zone size. After exposure for 100 h at 1100 °C (the most extreme exposure applied) the material also became significantly more notch sensitive and had failure characteristics similar to those of a monolithic ceramic. The ±45 composite was also embrittled which resulted in a reduced strain to failure but an increase in fracture strength. Density measurements and observations on the microstructure and fracture surfaces indicated that the embrittlement was due mainly to localised densification of the matrix and an increase in fibre/matrix bonding.
Original language | English |
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Pages (from-to) | 565-578 |
Number of pages | 14 |
Journal | Journal of the European Ceramic Society |
Volume | 24 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2004 |
Funding
This work was sponsored in part by the US Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy under contract DE. AC05-00OR22725 with UT-Battelle, LLC. Financial support from the Swedish Research Council for Engineering Sciences (TFR) is also acknowledged. The authors thank Dr. Michael Lance for performing the RAMAN experiment and Siemens-Westinghouse and Composite Optics for providing the material used in this study. Dr. Oleg Babushkin is acknowledged for performing the XRD experiments.
Keywords
- Composites
- Fibres
- Mechanical properties
- Nextel fibres
- Thermal degradation