TY - JOUR
T1 - Combustion synthesis of metallic foams from nanocomposite reactants
AU - Hunt, Emily M.
AU - Pantoya, Michelle L.
AU - Jouet, R. Jason
PY - 2006/6
Y1 - 2006/6
N2 - Highly porous intermetallic alloys were created through self-propagating high-temperature synthesis. The reactants are composed of nano-scale particles of nickel (Ni), micron-scale particles of aluminum (Al), and nano-scale Al particles passivated with a gasifying agent, C13F27COOH. The concentration of nano-Al particles present in the reactant matrix was controlled according to the wt% gasifying agent. Flame propagation was observed to transition from normal to convectively dominant burning as more gasifying agent became present in the reactants. Ignition delay times were reduced by two orders of magnitude when only 2.24 wt% nm Al particles were present. The product alloy expanded by a factor of 14 in the axial direction with 1.6 wt% nm Al (corresponding to 10 wt% gasifying agent). The total porosity of the pellets increased by a factor of 8 (i.e., from 10 to 80% porosity for 0-14 wt% gasifying agent).
AB - Highly porous intermetallic alloys were created through self-propagating high-temperature synthesis. The reactants are composed of nano-scale particles of nickel (Ni), micron-scale particles of aluminum (Al), and nano-scale Al particles passivated with a gasifying agent, C13F27COOH. The concentration of nano-Al particles present in the reactant matrix was controlled according to the wt% gasifying agent. Flame propagation was observed to transition from normal to convectively dominant burning as more gasifying agent became present in the reactants. Ignition delay times were reduced by two orders of magnitude when only 2.24 wt% nm Al particles were present. The product alloy expanded by a factor of 14 in the axial direction with 1.6 wt% nm Al (corresponding to 10 wt% gasifying agent). The total porosity of the pellets increased by a factor of 8 (i.e., from 10 to 80% porosity for 0-14 wt% gasifying agent).
KW - A. Nanostructured intermetallics
KW - A. Nickel aluminides based on NiAl
KW - C. Reaction synthesis
UR - http://www.scopus.com/inward/record.url?scp=32644438285&partnerID=8YFLogxK
U2 - 10.1016/j.intermet.2005.10.011
DO - 10.1016/j.intermet.2005.10.011
M3 - Article
AN - SCOPUS:32644438285
SN - 0966-9795
VL - 14
SP - 620
EP - 629
JO - Intermetallics
JF - Intermetallics
IS - 6
ER -