TY - GEN
T1 - Multi-functional metal/ceramic hybrid composites for structural applications
AU - Nanko, Makoto
AU - Maruoka, Daisuke
AU - Thuy, Nguyen Dang
PY - 2012
Y1 - 2012
N2 - 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 nano-particle in the structural ceramics. Crack healing of metal/ceramic hybrid composites was investigated for structural applications. Cracks of nano-Ni/Al2O 3 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.
AB - 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 nano-particle in the structural ceramics. Crack healing of metal/ceramic hybrid composites was investigated for structural applications. Cracks of nano-Ni/Al2O 3 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.
KW - Bending strength
KW - Crack-healing
KW - High-temperature oxidation
KW - Nanocomposite
KW - Pulsed electric current sintering
UR - http://www.scopus.com/inward/record.url?scp=84856182171&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84856182171&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.706-709.1984
DO - 10.4028/www.scientific.net/MSF.706-709.1984
M3 - Conference contribution
AN - SCOPUS:84856182171
SN - 9783037853030
T3 - Materials Science Forum
SP - 1984
EP - 1989
BT - THERMEC 2011
PB - Trans Tech Publications Ltd
T2 - 7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
Y2 - 1 August 2011 through 5 August 2011
ER -