Affiliation:
1. Suranaree University of Technology
Abstract
The mechanical properties of Al2O3-SiC based composites were improved by the addition of ZrO2(3Y) particles in the range of 10 to 25 vol.%. Al2O3-SiC/ZrO2(3Y) composites were manufactured by pressureless sintering at 1550, 1600, and 1650oC. Sintered composites were characterized for density, XRD, microstructure and mechanical properties such as flexural strength, fracture toughness and hardness. The results showed that the highest flexural strength of 250 MPa was obtained with 25 vol.% ZrO2(3Y) composite sintered at 1600oC due to higher density and smaller Al2O3grains in comparison with samples sintered at 1550oC and 1650oC, respectively. The maximum fracture toughness of 5.66 MPa.m1/2was obtained with 20 vol.% ZrO2(3Y) sintered at 1600oC. The highest hardness of 9.16 GPa was obtained with composite of 10 vol.% ZrO2(3Y) sintered at 1600oC as it contains the largest amount of hard SiC.
Publisher
Trans Tech Publications, Ltd.
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