Comparative investigations of the activated sintered W-1 wt.% Ni composites reinforced with various oxide and boride particles

Duygu Aǧaoǧullari*, Özge Balci, Hasan Gökçe, M. Lütfi Öveçoǧlu, Ismail Duman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The effects of different kinds of oxide (La2O3 and Y2O3) and boride (CrB2, HfB2 and ZrB2) particles on the physical, microstructural and mechanical properties of the W-1 wt.% Ni matrix composites were investigated. Powder blends having compositions of W-1 wt.% Ni, W-1 wt.% Ni-1 wt.% x, and W-1 wt.% Ni-1 wt.% x-2 wt.% y (x = La2O3 and Y2O3; y = CrB2, HfB2 and ZrB2) were mechanically alloyed (MA'd) for 12 h in a Spex™ Mixer/Mill with a rate of 1200 rpm using tungsten carbide vial and balls. MA'd powders were compacted to cylindrical preforms in a hydraulic press under a uniaxial pressure at 400 MPa and the green compacts were sintered at 1400 C for 1 h under Ar/H2 gas flowing conditions. Phase and microstructural characterization investigations of the MA'd powders and sintered composites were performed using X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) techniques. Density, Vickers microhardness and sliding wear tests were conducted on the sintered samples. The simpler systems of the hybrid composites (W-1 wt.% Ni, W-1 wt.% Ni-1 wt.% La2O3 and W-1 wt.% Ni-1 wt.% Y2O3) yield inferior mechanical properties than those of the hybrid composites. Among the fabricated hybrid composites, W-1 wt.% Ni-1 wt.% La2O3-2 wt.% CrB 2 had the highest density value of 98.89% and W-1 wt.% Ni-1 wt.% La2O3-2 wt.% HfB2 had the highest microhardness value (7.97 ± 0.50 HV) and the lowest relative wear volume loss (0.37).

Original languageEnglish
Pages (from-to)577-584
Number of pages8
JournalInternational Journal of Refractory Metals and Hard Materials
Volume41
DOIs
Publication statusPublished - Nov 2013

Funding

This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) with the project title “Development of tungsten based hybrid composites via activated sintering and mechanical alloying using high energy milling at cryogenic and ambient conditions and related characterization investigations” and with the project number 110M130 . The authors would like to express their gratitude to Prof. Dr. Hüseyin Çimenoğlu for his help during sliding wear tests and during SEM characterization. We would also like to acknowledge the State Planning Organization (DPT) for funding the project entitled “Advanced technologies in engineering” with the project number 2001K120750 out of which the main infrastructure of the Particulate Materials Laboratories was founded.

FundersFunder number
DPT2001K120750
TUBITAK110M130
Devlet Planlama Örgütü
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

    Keywords

    • Activated sintering
    • Mechanical alloying
    • Mechanical properties
    • Microstructure
    • Tungsten matrix composites
    • X-ray diffraction

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