| Abstract Scope |
Ceramics are known for their hardness, compressive strength and corrosion resistance, but poor toughness restricts their applications. Metal fiber reinforcement can improve toughness more than any other ceramic toughening methods. This research aimed to investigate the mechanical properties of magnesium aluminate spinel (MAS) reinforced by Nichrome grade A (80 wt% nickel) fibers. MAS powder was wet milled with 5 mol% MnO<sub>2</sub> (MAS-5Mn) to promote sintering, then sintered with Nichrome fibers at 1400°C. Flexural strength, flexural modulus, fracture toughness and work of fracture were determined via three point bending tests; Vickers hardness was also obtained. Metal-ceramic interfaces were analyzed using energy dispersive x-ray spectroscopy and fracture surfaces were examined with scanning electron microscopy. Next steps for this project include optimizing fiber content, length, and thickness, and minimizing sintering temperature. Potential applications of this composite include light armor, bearings and other wear resistant components. |