Effects of Y2O3 additions on mechanically alloyed and sintered W—4 wt.% SiC composites |
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Authors: | Selim Co?kun M Lütfi Öveço?lu[Author vitae] |
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Affiliation: | aParticulate Materials Laboratories, Department of Metallurgy and Materials Engineering, Istanbul Technical University, ITU Ayazaga Kampusu Maslak, 34469 Maslak, Istanbul, Turkey |
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Abstract: | In this study, the effect of Y2O3 additions on the microstructural and the physical properties of W-SiC composites was investigated. Powder blends of W—4 wt.% SiC, W—4 wt.% SiC—1 wt.% Y2O3 and W—4 wt.% SiC—5 wt.% Y2O3 were mechanically alloyed (MA'd) using a Spex mill for 24 h. MA'd composite powders were sintered under inert Ar and reducing H2 gas conditions at 1680 °C for 1 h. Microstructural and morphological characterizations of composite powders and sintered samples were carried out via SEM and XRD analyses. Furthermore, density measurements and hardness measurements of sintered samples were carried out. A highest Vickers microhardness value of 11.4 GPa was measured for the sintered W—4 wt.% SiC—5 wt.% Y2O3 while W—4 wt.% SiC sample possessed the highest relative density value of 97.7%. |
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Keywords: | W-SiC Y2O3 Mechanical alloying Solid-state sintering Microstructure |
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