a self-propagating foaming process of porous al-ni intermetallics assisted by combustion reactions自动传输的发泡过程的多孔al-ni协助下金属间化合物燃烧反应.pdfVIP

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a self-propagating foaming process of porous al-ni intermetallics assisted by combustion reactions自动传输的发泡过程的多孔al-ni协助下金属间化合物燃烧反应.pdf

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a self-propagating foaming process of porous al-ni intermetallics assisted by combustion reactions自动传输的发泡过程的多孔al-ni协助下金属间化合物燃烧反应

Materials 2009, 2, 2360-2368; doi:10.3390/ma2042360 OPEN ACCESS materials ISSN 1996-1944 /journal/materials Article A Self-Propagating Foaming Process of Porous Al-Ni Intermetallics Assisted by Combustion Reactions Makoto Kobashi * and Naoyuki Kanetake Graduate School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya, Aichi 4648603, Japan; E-Mail: kanetake@numse.nagoya-u.ac.jp (N.K.) * Author to whom correspondence should be addressed; E-Mail: kobashi@numse.nagoya-u.ac.jp (M.K.); Tel.: +81-52-789-3356; Fax: +81-52-789-5348. Received: 29 October 2009; in revised form: 3 December 2009 / Accepted: 14 December 2009 / Published: 15 December 2009 Abstract: The self-propagating foaming process of porous Al-Ni intermetallics was investigated. Aluminum and nickel powders were blended, and titanium and boron carbide powders were added as reactive exothermic agents. The blended powder was extruded to make a rod-shape precursor. Only one end of the rod precursor was heated to ignite the reaction. The reaction propagated spontaneously throughout the precursor. Pore formation took place at the same time as the reaction occurred. Adding the exothermic agent was effective to increase the porosity. Preheating the precursor before the ignition was also very effective to produce porous Al-Ni intermetallics with high porosity. Keywords: combustion foaming; Al3Ni; intermetallics; self-propagating high-temperature synthesis; exothermic reaction 1