Bonding characteristics at the Ni-alumina composite interface via STEM-based EELS technique
by Mao-xiang Jing, Dong-hong Li, Xiang-qian Shen, Wang-xing Li
International Journal of Materials and Structural Integrity (IJMSI), Vol. 1, No. 4, 2008

Abstract: Bonding characteristics of the metal and ceramic interfaces are significant to understand toughening mechanisms and design metal-ceramic composites. The Ni/alumina composite has been prepared by hot press-sintering of Ni-coated alumina powders and the bonding characteristics at the Ni-alumina composite interface have been studied by use of transmission electron microscopy (TEM)-based electron energy loss spectroscopy (EELS) techniques. From Al L_2,3, Ni L_2,3, and O K-edge EELS spectrum obtained, it can be reasoned that the interface in the Ni/alumina composite mainly consists of aluminum-terminated alumina and metallic Ni, and the bonding between them is primarily nonreactive with a nonionic –Ni–Ni–Al–O–linkage, rather than by chemical bonding with Ni–O bonds from –Ni–Ni–Ni–O–Al–O– or chemical reaction forming spinel interphases.

Online publication date: Thu, 17-Jul-2008

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