Authors
1 Malek-e-Ashtar University of Technology, Faculty of Materials & Manufacturing Processes, Tehran, Iran
2 Malek-e-Ashtar University of Technology, Faculty of Materials & Manufacturing Processes, Tehran, Iran.
Abstract
In the present paper, ZrB2-SiC nanocomposite was developed by pressureless sintering method. Micro
sized AlN powder and SiC powderes at nano and micro-sized scale were used as additive. In order to produce
composite samples, the primary powders were milled and blended in planetary ball mill apparatus with rotational speed
of 200rpm and then processed using hot pressing (80ᵒC and 100MPa), cold isostatic press and sintering at 2150ᵒC. The
values of relative density and porosity of samples were measured to evaluate the effect of presence of micro-sized SiC
and SiC nano particles simultaneously on the pressureless sintering behavior of ZrB2-SiC. In order to compare the
microstructure and mechanical properties of samples Scanning Electron microscopy (SEM), equipped with EDS
spectroscopy, XRD analysis, hardness and toughness tests were used. The results show that as the volume percentage of
nano SiC decreases to 15 vol.% and AlN increases to 7.5 vol.% the hardness (17.1 GPa), toughness (5.7 MPa.m1/2) and
relative density (98.1%) increase.
Keywords
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