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Andreas Haeger, Karl G. Schell, Alwin Nagel, Ethel C. Bucharsky, Rainer Oberacker, Michael J. Hoffmann
Advanced Engineering Materials, Volume 14, Issue 9, pages 795–801, September 2012
Materials Research Institute, Aalen University, Beethovenstr. 1, 73430 Aalen, Germany
Institute for Applied Materials – Ceramics in Mechanical Engineering, Karlsruhe Institute of Technology, Haid-und-Neu-Str. 7, 76131 Karlsruhe, Germany
Abstract
A method to manufacture unique interpenetrating 50 vol% nickel–chromium/alumina composites, namely NiCr8020/Al2O3/50pp, is reported. Key process is a high temperature squeeze casting procedure at temperatures above 1500 °C used to infiltrate alloy NiCr8020 into porous alumina preforms exhibiting a bimodal pore structure. Microstructure and mechanical properties of this new composite material are presented. Bending creep tests at 1000 and 1150 °C are performed. The obtained results are discussed in comparison to a nickel based superalloy. It is shown, that particle preform reinforcement is a promising method to improve creep resistance of nickel based alloys significantly. Due to its outstanding creep resistance, the composite material has a high potential for structural and tribological applications at high temperatures in oxidizing atmospheres.
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