Abstract
Reinforcement by discontinuous whiskers or continuous fibers resulted in substantial improvements in fracture toughness and damage tolerance of ceramic-based composites over conventional monolithic ceramics. For instance, the addition of SiC whiskers led to substantial enhancements in fracture, slow crack growth, thermal shock, and static/cyclic fatigue resistances of monolithic aluminas.1–5 The increased toughness in these ceramic composites is derived from the operative toughening mechanisms of fiber/whisker bridging and pullout behind the crack tip.6 In addition, research also showed that the alumina composites retained their strength and fracture toughness to temperatures of 1000 – 1100°C in an oxidizing environment.3 This was also coupled with the much superior resistance to elevated-temperature delayed failure and creep deformation in alumina composites as compared with polycrystalline fine-grained aluminas.3, 7 These excellent mechanical properties indicate that the alumina-SiC composites exhibit potential for high-temperature structural applications.
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Lin, HT., Becher, P.F. (1995). Creep Behavior in SiC Whisker-Reinforced Alumina Composite. In: Bradt, R.C., Brookes, C.A., Routbort, J.L. (eds) Plastic Deformation of Ceramics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1441-5_48
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DOI: https://doi.org/10.1007/978-1-4899-1441-5_48
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