Microstructures and Mechanical Properties of Spark Plasma Sintered Al2O3-Co Composites Using Electroless Deposited Al2O3-Co Powders

Byong-Taek Lee; Ki-Ho Kim; A. H. M. Esfakur Rahman; Ho-Yeon Song

doi:10.2320/matertrans.MRA2008015

Microstructures and Mechanical Properties of Spark Plasma Sintered Al₂O₃-Co Composites Using Electroless Deposited Al₂O₃-Co Powders

Byong-Taek Lee, Ki-Ho Kim, A. H. M. Esfakur Rahman, Ho-Yeon Song

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Keywords: Al₂O₃-Co composite, electroless deposition, nano coating, spark plasma sintering

JOURNAL FREE ACCESS

2008 Volume 49 Issue 6 Pages 1451-1455

DOI https://doi.org/10.2320/matertrans.MRA2008015

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Abstract

Microstructures and mechanical properties of spark plasma sintered (SPS) Al₂O₃-Co composites were investigated depending on the sintering temperatures (900–1200°C) and cobalt contents (0∼12 mass%). The material properties of relative density and fracture toughness increased as the sintering temperature and Co content (up to 12 mass%Co) increased. In the SPSed Al₂O₃-Co composite sintered at 1200°C, maximum values of relative density and fracture toughness about 99.3% and 8.1 MPam^1⁄2, respectively were obtained. The fracture morphology of SPSed Al₂O₃-12 mass%Co composite showed a semi-brittle fracture mode due to the homogeneous dispersion of fine-sized Co particles.

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