材料期刊网

Effect of Wetting and NiAl_2O_4 Spinel Formation on the Bonding between Al_2O_3 and Ni

Xudong SUN and J.A. Yeomans (Dept. of Materials Science and Engineering , University of Surrey Guildford , Surrey GU2 5XH , UK (To whom correspondence should be addressed Present address: Dept. of Materials Science and Engineering , Northeastern University

材料科学技术（英文）

Al2O3-Ni interface formed under vacuum condition is non-wetting and weak. Severe instantaneous intedecial reaction (i.e. wetting) at the Al2O3-Ni interface promoted by oxygen can create a strengthened interface. The NiAl2O4 spinel-Ni intedece is weak and growth of the spinel interphase is detrimental to the Al2O3-Ni intedecial bonding. A proper control of the oxygen partial pressure can achieve wetting while avoiding the existence of spinel at the interface, producing stronger interfaces by both mechanical interlocking and more intimate chemical bonding in an Al2O3-20 vol pct Ni composite.

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