Abstract
Dense Functionally Graded Materials (FGMs) in the systems of Al2O3/TiC/Ni and (Al2O3-WC/Co)/TiC/Ni were fabricated at 1300°C and 10 minutes by pulsed-electric current sintering method. The grain growth was effectively prevented and fine microstructure could be obtained by this rapid sintering. The residual stress produced in the outer Al2O3 and Al2O3-WC/Co layers of FGMs, which was induced by the thermal expansion mismatch between the inner TiC/Ni layer and the outer layers, was in the range of-180 MPa to-300 MPa. The compressive stress and the dispersion of WC/Co particles enhanced the toughness of the outer ceramic layers, and developed steep R-Curve behavior.
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