Fabrication and characterization of titanium-nickel-zirconia matrix composites prepared by spark plasma sintering

Ti–Ni–ZrO2 composites were prepared by spark plasma sintering (SPS). The effect of ZrO2 content on the densification, microstructure and microhardness properties of the composites were investigated. Samples were characterized by SEM, EDS and XRD analyses. Noticeably, SPS process under the sintering...

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Veröffentlicht in:Journal of alloys and compounds 2017-07, Vol.710, p.825-830
Hauptverfasser: Obadele, Babatunde Abiodun, Ige, Oladeji Oluremi, Olubambi, Peter Apata
Format: Artikel
Sprache:eng
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Zusammenfassung:Ti–Ni–ZrO2 composites were prepared by spark plasma sintering (SPS). The effect of ZrO2 content on the densification, microstructure and microhardness properties of the composites were investigated. Samples were characterized by SEM, EDS and XRD analyses. Noticeably, SPS process under the sintering conditions was achieved at a sintering temperature of 950 °C, for 10 min holding time, at 100 °C/min of heating rate and at an applied pressure of 50 MPa. This resulted in maximum densification of the powder compact and the formation of a distinguishable spherical globules rich in Ni surrounding the retained Ti. Gradient composition distribution of ZrO2 at the grain boundaries resulted into pinning effect of the grain growth. As the ZrO2 content increased from 5 to 10 vol%, it was accompanied by a significant increase in hardness values of the sintered composites from 480 to 713 HV. [Display omitted] •Ti–Ni–ZrO2 composite was prepared via spark plasma sintering.•Microstructure of the sintered Ti-Ni-ZrO2 composites was characterized.•Sintered relative density increased with the presence of zirconia.•ZrO2 addition influenced microhardness values.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.03.340