Wetting and strength issues at Al/alpha-alumina interfaces

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The wetting behavior and strength at aluminum/alumina interfaces has been an active subject of research. Al/alumina applications include ceramic-metal composites and several applications for electronic industries. In this paper the interface strength and microstructure of Al/alpha-alumina was investigated. We discovered that in a solid-state joining, the strength of the joint increases with increasing joining temperature. In a liquid-state joining, the strength of the joint gradually decreases due to the formation of unbonded areas. The strength, sigma sub b, is expressed by the following equation as a function of unbonded area, A: sigma sub b = 2.22 A + 143 (70 ... continued below

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Saiz, Eduardo; Tomsia, Antoni P. & Suganuma, Katsuaki April 15, 2003.

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The wetting behavior and strength at aluminum/alumina interfaces has been an active subject of research. Al/alumina applications include ceramic-metal composites and several applications for electronic industries. In this paper the interface strength and microstructure of Al/alpha-alumina was investigated. We discovered that in a solid-state joining, the strength of the joint increases with increasing joining temperature. In a liquid-state joining, the strength of the joint gradually decreases due to the formation of unbonded areas. The strength, sigma sub b, is expressed by the following equation as a function of unbonded area, A: sigma sub b = 2.22 A + 143 (70 percent {le} A {le} 100 percent). The highest strength reached 400 MPa when the interface was formed at around the melting temperature of aluminum. An aluminum layer close to the interface became a single crystal when it was bonded to a sapphire. The following crystallographic orientation relationship is established: (1{bar 1}1){sub Al}//(001){sub {alpha}}-Al{sub 2} O{sub 3}, (110){sub Al}//<100>{sub {alpha}}-Al{sub 2}O{sub 3}. Amorphous alumina islands were formed at the interface. In the amorphous alumina, gamma-alumina nanocrystals grew from the sapphire, with the same orientation relationship to sapphire as above.

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  • Journal Name: Journal of the European Ceramic Society; Journal Volume: 23; Journal Issue: 15; Other Information: Journal Publication Date: 2003

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  • Report No.: LBNL--52952
  • Grant Number: AC03-76SF00098
  • DOI: 10.1016/S0955-2219(03)00290-5 | External Link
  • Office of Scientific & Technical Information Report Number: 827082
  • Archival Resource Key: ark:/67531/metadc784787

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 15, 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 2:44 p.m.

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Saiz, Eduardo; Tomsia, Antoni P. & Suganuma, Katsuaki. Wetting and strength issues at Al/alpha-alumina interfaces, article, April 15, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc784787/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.