Multi-Functional Metal/Ceramic Hybrid Composites for Structural Applications

Abstract:

Some ceramic based hybrid composites with metallic particles have excellent mechanical properties. In particular, metal/ceramic nanocomposites has high mechanical strength and improved fracture toughness. Magnetized hybrid composites can be produced by dispersing Fe, Co or Ni nanoparticle in the structural ceramics. Crack healing of metal/ceramic hybrid composites was investigated for structural applications. Cracks of nanoNi/Al₂O₃ introduced by the Vickers indentation of 49 N could be repaired completely, for example, by air oxidation at 1200°C for 6 h. Even larger cracks introduced by 490 N indentation was healed up to a comparable level of mechanical strength by oxidation at 1200°C for 24 h in air. Outward diffusion of cations during high-temperature oxidation would cause crack repair by filling with an oxidation product. Faster crack disappearance, 900°C for 1 h, was realized on Mo/Al₂O₃. Surface crack healing effectiveness promoted by outward diffusion of cations is potentially applied into various Al₂O₃ based hybrid material systems, as well as excellent mechanical properties.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 1984-1989
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.1984
• Online since: January 2012
• Authors: Makoto Nanko, Daisuke Maruoka, Nguyen Dang Thuy
• Keywords: Al₂O₃, Bending Strength, Crack-Healing, High-Temperature Oxidation, Nanocomposite, Pulsed Electric Current Sintering

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