Al_2O_3/SiCナノ複合材料の微細組織と高温硬度

概要

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The purpose of this paper is to investigate in detail the relation between the microstructure and high-temperature hardness for Al_2O_3/SiC micro-and nanocomposites. Two types of Al_2O_3/SiC composites were fabricated by hot-pressing the mixtures obtained by a conventional ceramic process. Al_2O_3/finer-SiC composites showed a peculiar microstructure with nanometer-size SiC particles located inside the matrix Al_2O_3 grains, yielding "nanocomposite", whereas Al_2O_3/2μm-SiC composites had the 2μm-SiC particles dispersedat the grain boundary, yielding "microcomposite". The addition of SiC was found to be very effective in improving the high-temperature mechanical properties of Al_2O_3 for both of the above Al_2O_3/SiC composites. Especially, Al_2O_3/finer-SiC nanocomposites exhibited a better deformation resistance and anti-creep behavior at high-temperatures.
社団法人日本材料学会の論文
1993-05-15