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A Cost‐Efficient Fabrication Strategy for Conductive Ti 2 AlC Honeycomb Monolith Using Elemental Powders
Author(s) -
Fang Xuanming,
Wang Xiaohui,
Zhang Hui,
Li Zhaojin,
Li Jialin,
Zhou Yanchun
Publication year - 2015
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400546
Subject(s) - monolith , materials science , honeycomb , exothermic reaction , fabrication , honeycomb structure , graphite , sintering , composite material , ceramic , phase (matter) , chemical engineering , catalysis , medicine , biochemistry , chemistry , alternative medicine , organic chemistry , pathology , engineering
A cost‐efficient strategy using elemental powders of Ti, Al, and graphite as starting materials is proposed to fabricate conductive Ti 2 AlC honeycomb monolith. The honeycomb structure is extruded from a plastic feed material composed of the initial powders and several additives. Phase‐pure Ti 2 AlC can be obtained with a direct heating schedule, but the shape of the extruded green body will be destroyed due to thermal explosion in Ti−Al−C strongly exothermic system, which is resulted from the rapid release of latent heat from reactions between the elemental powders during heating process. To avoid the thermal explosion, the honeycomb sample is dwelled at 650 °C for 2 h to release latent heat in a controlled manner. As a result, Ti 2 AlC honeycomb monolith with designed structure is obtained, followed by sintering at elevated temperatures. In addition, the phase evolution and mechanism for pore formation are discussed.