Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Özge Balcı; Duygu Ağaoğulları; Faiz Muhaffel; M. Lütfi Öveçoğlu; Hüseyin Çimenoğlu; İsmail Duman

doi:10.1016/j.jeurceramsoc.2016.05.014

Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Özge Balcı^*, Duygu Ağaoğulları, Faiz Muhaffel, M. Lütfi Öveçoğlu, Hüseyin Çimenoğlu, İsmail Duman

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

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

21 Citations (Scopus)

Abstract

This study reports on the consolidation of niobium boride powders by cold pressing/pressureless sintering (PS, with or without Co addition) and spark plasma sintering (SPS) techniques. Niobium boride powders (containing NbB, Nb₃B₄ and NbB₂ phases) which were mechanochemically synthesized from Nb₂O₅, B₂O₃ and Mg blends and purified by HCl leaching were used as precursor material. The effects of different sintering techniques on the consolidation behaviour, microstructure, densification rate and mechanical properties (microhardness, wear characteristics, elastic modulus, indentation response and fracture toughness) of the bulk products were investigated. PS with Co addition resulted in superior properties than those yielded after PS without Co addition and SPS. Bulk niobium boride products having relative density of 93–98%, microhardness of 24–28 GPa, wear volume loss of 2.8–4.5 × 10⁻⁴ mm³, elastic modulus of 508–552 GPa and fracture toughness of 4.05–4.74 MPa m^1/2 were obtained by Co (2 or 5 wt.%) activated PS at 1500 °C.

Original language	English
Pages (from-to)	3113-3123
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	36
Issue number	13
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2016.05.014
Publication status	Published - 1 Oct 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd

Funding

This research investigation was financially supported by “The Scientific and Technological Research Council of Turkey (TÜBİTAK)” with the project title of “Synthesis of Refractory Metal Borides via Three Different Production Methods from Solid, Liquid and Gas Raw Materials for Various Application Areas; Sintering, Characterization, Comparison of Process and Final Products” and with the project number of 112M470. Further, the authors wish to express their appreciations to Prof. Dr. Servet Turan for his help with the SPS experiments.

Funders	Funder number
TÜBİTAK	112M470
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

Keywords

Cold pressing/pressureless sintering
Mechanical properties
Microstructure
Niobium borides
Spark plasma sintering

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10.1016/j.jeurceramsoc.2016.05.014

Cite this

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title = "Effect of sintering techniques on the microstructure and mechanical properties of niobium borides",

abstract = "This study reports on the consolidation of niobium boride powders by cold pressing/pressureless sintering (PS, with or without Co addition) and spark plasma sintering (SPS) techniques. Niobium boride powders (containing NbB, Nb3B4 and NbB2 phases) which were mechanochemically synthesized from Nb2O5, B2O3 and Mg blends and purified by HCl leaching were used as precursor material. The effects of different sintering techniques on the consolidation behaviour, microstructure, densification rate and mechanical properties (microhardness, wear characteristics, elastic modulus, indentation response and fracture toughness) of the bulk products were investigated. PS with Co addition resulted in superior properties than those yielded after PS without Co addition and SPS. Bulk niobium boride products having relative density of 93–98%, microhardness of 24–28 GPa, wear volume loss of 2.8–4.5 × 10−4 mm3, elastic modulus of 508–552 GPa and fracture toughness of 4.05–4.74 MPa m1/2 were obtained by Co (2 or 5 wt.%) activated PS at 1500 °C.",

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AU - Ağaoğulları, Duygu

AU - Muhaffel, Faiz

AU - Öveçoğlu, M. Lütfi

AU - Çimenoğlu, Hüseyin

AU - Duman, İsmail

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N2 - This study reports on the consolidation of niobium boride powders by cold pressing/pressureless sintering (PS, with or without Co addition) and spark plasma sintering (SPS) techniques. Niobium boride powders (containing NbB, Nb3B4 and NbB2 phases) which were mechanochemically synthesized from Nb2O5, B2O3 and Mg blends and purified by HCl leaching were used as precursor material. The effects of different sintering techniques on the consolidation behaviour, microstructure, densification rate and mechanical properties (microhardness, wear characteristics, elastic modulus, indentation response and fracture toughness) of the bulk products were investigated. PS with Co addition resulted in superior properties than those yielded after PS without Co addition and SPS. Bulk niobium boride products having relative density of 93–98%, microhardness of 24–28 GPa, wear volume loss of 2.8–4.5 × 10−4 mm3, elastic modulus of 508–552 GPa and fracture toughness of 4.05–4.74 MPa m1/2 were obtained by Co (2 or 5 wt.%) activated PS at 1500 °C.

AB - This study reports on the consolidation of niobium boride powders by cold pressing/pressureless sintering (PS, with or without Co addition) and spark plasma sintering (SPS) techniques. Niobium boride powders (containing NbB, Nb3B4 and NbB2 phases) which were mechanochemically synthesized from Nb2O5, B2O3 and Mg blends and purified by HCl leaching were used as precursor material. The effects of different sintering techniques on the consolidation behaviour, microstructure, densification rate and mechanical properties (microhardness, wear characteristics, elastic modulus, indentation response and fracture toughness) of the bulk products were investigated. PS with Co addition resulted in superior properties than those yielded after PS without Co addition and SPS. Bulk niobium boride products having relative density of 93–98%, microhardness of 24–28 GPa, wear volume loss of 2.8–4.5 × 10−4 mm3, elastic modulus of 508–552 GPa and fracture toughness of 4.05–4.74 MPa m1/2 were obtained by Co (2 or 5 wt.%) activated PS at 1500 °C.

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Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Abstract

Bibliographical note

Funding

Keywords

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