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 L2,3, Ni L2,3, 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.
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