Effects of Y2O3 additions on mechanically alloyed and sintered W-4 wt.% SiC composites

Selim Coşkun; M. Lütfi Öveçoǧlu

doi:10.1016/j.ijrmhm.2011.04.013

Effects of Y₂O₃ additions on mechanically alloyed and sintered W-4 wt.% SiC composites

Selim Coşkun^*, M. Lütfi Öveçoǧlu

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

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.% Y ₂O₃ 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.% Y₂O ₃ while W-4 wt.% SiC sample possessed the highest relative density value of 97.7%.

Original language	English
Pages (from-to)	651-655
Number of pages	5
Journal	International Journal of Refractory Metals and Hard Materials
Volume	29
Issue number	6
DOIs	https://doi.org/10.1016/j.ijrmhm.2011.04.013
Publication status	Published - Nov 2011

Funding

The authors wish to express their thanks to the Scientific and Technological Research Council of Turkey (TUBİTAK ) for the financial support under the project number 105M065 . Laboratory equipment utilized in this study was purchased through the research grant 2001 K 750-90146 provided by the State Planning Organization (DPT ) and this is gratefully acknowledged.

Funders	Funder number
DPT
TUBİTAK	105M065, 2001 K 750-90146
Devlet Planlama Örgütü
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

Keywords

Mechanical alloying
Microstructure
Solid-state sintering
W-SiC
YO

Access to Document

10.1016/j.ijrmhm.2011.04.013

Cite this

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title = "Effects of Y2O3 additions on mechanically alloyed and sintered W-4 wt.% SiC composites",

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.% Y 2O3 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.% Y2O 3 while W-4 wt.% SiC sample possessed the highest relative density value of 97.7%.",

keywords = "Mechanical alloying, Microstructure, Solid-state sintering, W-SiC, YO",

author = "Selim Co{\c s}kun and {\"O}ve{\c c}oǧlu, {M. L{\"u}tfi}",

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AU - Coşkun, Selim

AU - Öveçoǧlu, M. Lütfi

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N2 - 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.% Y 2O3 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.% Y2O 3 while W-4 wt.% SiC sample possessed the highest relative density value of 97.7%.

AB - 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.% Y 2O3 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.% Y2O 3 while W-4 wt.% SiC sample possessed the highest relative density value of 97.7%.

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