combustion synthesis of porous ticti composite by a self-propagating mode燃烧合成的多孔ticti复合自动传输的模式.pdfVIP

Materials 2010, 3, 3939-3947; doi:10.3390/ma3073939 OPEN ACCESS materials ISSN 1996-1944 /journal/materials Article Combustion Synthesis of Porous TiC/Ti Composite by a Self-Propagating Mode Makoto Kobashi 1,*, Daishi Ichioka 2 and Naoyuki Kanetake 1 1 Graduate School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan; E-Mail: kanetake@numse.nagoya-u.ac.jp (N.K.) 2 Graduate student, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan * Author to whom correspondence should be addressed; E-Mail: kobashi@numse.nagoya-u.ac.jp; Tel.: +81-52-789-3356; Fax: +81-52-789-5348. Received: 21 May 2010; in revised form: 10 June 2010 / Accepted: 22 June 2010 / Published: 6 July 2010 Abstract: Porous titanium carbide (TiC) and TiC/Ti composites were synthesized by self-propagating high-temperature synthesis (SHS). Titanium and carbon powders were blended by various Ti/C blending ratios. The heat of reaction between titanium and carbon was high enough to induce the self-sustaining reaction of TiC formation on condition that some processing parameters (Ti/C ratio and porosity of the precursor) were appropriately selected. When the Ti/C blending ratio was high, the excess amount of titanium absorbed the heat of reaction. Consequently, the heated zone was not heated up to the ignition temperature. On the other hand, when the Ti/C ratio was low, high thermal conductivity of the precursor prevented an igniti