Spark plasma sintering of molybdenum silicides synthesized from oxide precursors

Didem Ovalı; Marek Tarraste; Mertcan Kaba; Duygu Ağaoğulları; Lauri Kollo; K. G. Prashanth; M. Lütfi Öveçoğlu

doi:10.1016/j.ceramint.2021.01.248

Spark plasma sintering of molybdenum silicides synthesized from oxide precursors

Didem Ovalı^*, Marek Tarraste, Mertcan Kaba, Duygu Ağaoğulları, Lauri Kollo, K. G. Prashanth, M. Lütfi Öveçoğlu

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

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

8 Citations (Scopus)

Abstract

This work investigated the spark plasma sintering behavior of mechanochemically synthesized molybdenum silicide (MS) powders. Nanosized MS powders were obtained via a mechanochemical synthesis process applied to the initial MoO₃–SiO₂–Mg powder batches. Various characterization techniques such as X-ray diffraction (XRD), particle size analysis (PSA), Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM) were performed to reveal the compositional and morphological properties of the homemade MS powders. The increasing sintering temperature up to 1600 °C enhanced the sinterability of the MS samples. In addition to the XRD and SEM/EDS analyses, the samples sintered at different temperatures were also characterized in terms of Archimedes' density, microhardness, and fracture toughness properties. The MS sample sintered at the temperature of 1600 °C demonstrated a relative density of 93.7%, a Vickers microhardness of 14.9 GPa, and a fracture toughness of 3.54 MPa√m. The wear rate decreased significantly with increasing sintering temperature from 3.60 × 10⁻⁵ mm³/Nm (1500 °C) to 1.77 × 10⁻⁵ mm³/Nm (1600 °C). Lastly, thermal gravimetry analyses (TGA) were conducted to observe the oxidation behavior of the sintered samples. The oxidation resistance of MS samples improved with increasing sintering temperatures.

Original language	English
Pages (from-to)	13827-13836
Number of pages	10
Journal	Ceramics International
Volume	47
Issue number	10
DOIs	https://doi.org/10.1016/j.ceramint.2021.01.248
Publication status	Published - 15 May 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd and Techna Group S.r.l.

Funding

Didem Ovalı would like to express her graduate to the Tallinn University of Technology and Archimedes Foundation for a Dora Plus grant short term visit and to the Tinçel Culture Foundation for the visiting student scholarships. Didem Ovalı appreciates Dr. Özge Balcı for her support in the research visit. This study was supported through a research project (#216M070) by The Scientific and Technological Research Council of Turkey (TUBITAK). A part of the research was supported by the institutional funding project IUT 19–29 and the grant PRG 665 of Estonian Research Council. The authors are grateful to Prof. Hüseyin Çimenoğlu for providing the wear test facility. The authors would like to thank the Central Research Laboratory at Namık Kemal University and Bursa Technical University for the SEM/EDS analyses. Didem Ovalı would like to express her graduate to the Tallinn University of Technology and Archimedes Foundation for a Dora Plus grant short term visit and to the Tinçel Culture Foundation for the visiting student scholarships. Didem Ovalı appreciates Dr. Özge Balcı for her support in the research visit. This study was supported through a research project (#216M070) by The Scientific and Technological Research Council of Turkey (TUBITAK). A part of the research was supported by the institutional funding project IUT 19–29 and the grant PRG 665 of Estonian Research Council . The authors are grateful to Prof. Hüseyin Çimenoğlu for providing the wear test facility. The authors would like to thank the Central Research Laboratory at Namık Kemal University and Bursa Technical University for the SEM/EDS analyses.

Funders	Funder number
Bursa Technical University
Tallinn University of Technology and Archimedes Foundation for a Dora Plus
Tinçel Culture Foundation	216M070
Eesti Teadusagentuur
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu	IUT 19–29, PRG 665
Tekirdağ Namık Kemal Üniversitesi

Keywords

Mechanical properties C
SPS A
Silicides D
X-ray methods B

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10.1016/j.ceramint.2021.01.248

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abstract = "This work investigated the spark plasma sintering behavior of mechanochemically synthesized molybdenum silicide (MS) powders. Nanosized MS powders were obtained via a mechanochemical synthesis process applied to the initial MoO3–SiO2–Mg powder batches. Various characterization techniques such as X-ray diffraction (XRD), particle size analysis (PSA), Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM) were performed to reveal the compositional and morphological properties of the homemade MS powders. The increasing sintering temperature up to 1600 °C enhanced the sinterability of the MS samples. In addition to the XRD and SEM/EDS analyses, the samples sintered at different temperatures were also characterized in terms of Archimedes' density, microhardness, and fracture toughness properties. The MS sample sintered at the temperature of 1600 °C demonstrated a relative density of 93.7%, a Vickers microhardness of 14.9 GPa, and a fracture toughness of 3.54 MPa√m. The wear rate decreased significantly with increasing sintering temperature from 3.60 × 10−5 mm3/Nm (1500 °C) to 1.77 × 10−5 mm3/Nm (1600 °C). Lastly, thermal gravimetry analyses (TGA) were conducted to observe the oxidation behavior of the sintered samples. The oxidation resistance of MS samples improved with increasing sintering temperatures.",

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AU - Ağaoğulları, Duygu

AU - Kollo, Lauri

AU - Prashanth, K. G.

AU - Lütfi Öveçoğlu, M.

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AB - This work investigated the spark plasma sintering behavior of mechanochemically synthesized molybdenum silicide (MS) powders. Nanosized MS powders were obtained via a mechanochemical synthesis process applied to the initial MoO3–SiO2–Mg powder batches. Various characterization techniques such as X-ray diffraction (XRD), particle size analysis (PSA), Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM) were performed to reveal the compositional and morphological properties of the homemade MS powders. The increasing sintering temperature up to 1600 °C enhanced the sinterability of the MS samples. In addition to the XRD and SEM/EDS analyses, the samples sintered at different temperatures were also characterized in terms of Archimedes' density, microhardness, and fracture toughness properties. The MS sample sintered at the temperature of 1600 °C demonstrated a relative density of 93.7%, a Vickers microhardness of 14.9 GPa, and a fracture toughness of 3.54 MPa√m. The wear rate decreased significantly with increasing sintering temperature from 3.60 × 10−5 mm3/Nm (1500 °C) to 1.77 × 10−5 mm3/Nm (1600 °C). Lastly, thermal gravimetry analyses (TGA) were conducted to observe the oxidation behavior of the sintered samples. The oxidation resistance of MS samples improved with increasing sintering temperatures.

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Spark plasma sintering of molybdenum silicides synthesized from oxide precursors

Abstract

Bibliographical note

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Keywords

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