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- W2012024182 abstract "High resolution transmission electron microscopy (HRTEM) and analytical electron microscopy (AEM) were used to investigate the structure and chemistry of (0001) α-Al2O3Al interfaces in melt-infiltrated polycrystalline α-Al2O3 composites. HRTEM revealed an 0.8 ± 0.2 nm wide interfacial region structurally different from both Al and α-Al2O3. AEM of the same interfaces revealed a Ca excess of Γ = 2.5 ± 0.5 Ca/nm2. Since the metal-ceramic interfaces were the basal α-Al2O3 surfaces at pores before melt-infiltration, it can be concluded that Ca segregates to the basal surface of α-Al2O3. Furthermore, the Ca at the free surfaces does not reside on only one cation plane, but is spread over 4 ± 1 basal cation layers, and forms an interfacial phase with a nominal composition of CaO·6Al2O3. The formation of the interface phase via segregation and reconstruction is discussed, based on microstructural observations of the α-Al2O3 matrix and possible roles of Ca in its development. The implications of the observations are the potential to control the ceramic-metal interface structure and chemistry via dopants (impurities) in the ceramic." @default.
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- W2012024182 date "1998-04-01" @default.
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- W2012024182 title "The influence of Ca on interface structure and chemistry in melt-infiltrated α-Al2O3Al composites" @default.
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- W2012024182 doi "https://doi.org/10.1016/s1359-6454(98)80018-9" @default.
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