Mechanical properties and oxidation behavior of spark plasma sintered (Zr,Ti)B2 ceramics with graphene nanoplatelets

Melis Kaplan Akarsu; Ipek Akin

doi:10.1016/j.ceramint.2020.07.106

Mechanical properties and oxidation behavior of spark plasma sintered (Zr,Ti)B₂ ceramics with graphene nanoplatelets

Melis Kaplan Akarsu, Ipek Akin^*

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

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

15 Citations (Scopus)

Abstract

This research focuses on the production and characterization of (Zr,Ti)B₂ solid solution systems. The purpose of this study is to understand how solid solution formation influences the structure, mechanical properties, and oxidation resistance of ZrB₂ and TiB₂. For this, herein, monolithic ZrB₂, TiB₂, and (Zr_xTi_1-x)B₂ solid solution systems (x = 0.25, 0.50, 0.58, 0.75) were prepared. Moreover, 1 vol% graphene nanoplatelets (GNPs) were added to two different solid solution systems (Zr_0.25Ti_0.75B₂ and Zr_0.58Ti_0.42B₂) without affecting the complete solid solubility of these systems. All powder mixtures were densified by spark plasma sintering at 1800 °C, under 50 MPa with 5 min holding time. The densification, oxidation behavior, microstructure, phases, and mechanical properties (Vickers hardness and indentation fracture toughness) of these samples were systematically investigated. The formation of solid solutions caused an increase in the Vickers hardness and fracture toughness of the samples. Further improvement in mechanical properties and better oxidation resistance were achieved with the addition of GNPs to the solid solution systems.

Original language	English
Pages (from-to)	26109-26120
Number of pages	12
Journal	Ceramics International
Volume	46
Issue number	16
DOIs	https://doi.org/10.1016/j.ceramint.2020.07.106
Publication status	Published - Nov 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.

Funding

The authors acknowledge Istanbul Technical University for financial support through project number: BAP-42163 . Moreover, Melis Kaplan Akarsu is thankful to the Scientific and Technological Research Council of Turkey (TUBITAK) and Council of High Education (YOK) for 2211/C Domestic Doctoral Scholarship and 100/2000 Ph.D. Scholarship, respectively. Authors are greatly indebted to Prof. Dr. G. Goller for providing production and characterization facilities and thankful to H. Sezer, B. Yavas, and MSGSU Merlab (Dr. O. Ormanci) for their assistance with microstructural investigations, SPS experiments, and Raman analysis, respectively. The authors acknowledge Istanbul Technical University for financial support through project number: BAP-42163. Moreover, Melis Kaplan Akarsu is thankful to the Scientific and Technological Research Council of Turkey (TUBITAK) and Council of High Education (YOK) for 2211/C Domestic Doctoral Scholarship and 100/2000 Ph.D. Scholarship, respectively. Authors are greatly indebted to Prof. Dr. G. Goller for providing production and characterization facilities and thankful to H. Sezer, B. Yavas, and MSGSU Merlab (Dr. O. Ormanci) for their assistance with microstructural investigations, SPS experiments, and Raman analysis, respectively.

Funders	Funder number
Council of High Education
MSGSU Merlab
TUBITAK
YOK
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu
Istanbul Teknik Üniversitesi	BAP-42163

Keywords

Borides
Oxidation
Solid solution
Spark plasma sintering

Access to Document

10.1016/j.ceramint.2020.07.106

Cite this

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abstract = "This research focuses on the production and characterization of (Zr,Ti)B2 solid solution systems. The purpose of this study is to understand how solid solution formation influences the structure, mechanical properties, and oxidation resistance of ZrB2 and TiB2. For this, herein, monolithic ZrB2, TiB2, and (ZrxTi1-x)B2 solid solution systems (x = 0.25, 0.50, 0.58, 0.75) were prepared. Moreover, 1 vol% graphene nanoplatelets (GNPs) were added to two different solid solution systems (Zr0.25Ti0.75B2 and Zr0.58Ti0.42B2) without affecting the complete solid solubility of these systems. All powder mixtures were densified by spark plasma sintering at 1800 °C, under 50 MPa with 5 min holding time. The densification, oxidation behavior, microstructure, phases, and mechanical properties (Vickers hardness and indentation fracture toughness) of these samples were systematically investigated. The formation of solid solutions caused an increase in the Vickers hardness and fracture toughness of the samples. Further improvement in mechanical properties and better oxidation resistance were achieved with the addition of GNPs to the solid solution systems.",

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AB - This research focuses on the production and characterization of (Zr,Ti)B2 solid solution systems. The purpose of this study is to understand how solid solution formation influences the structure, mechanical properties, and oxidation resistance of ZrB2 and TiB2. For this, herein, monolithic ZrB2, TiB2, and (ZrxTi1-x)B2 solid solution systems (x = 0.25, 0.50, 0.58, 0.75) were prepared. Moreover, 1 vol% graphene nanoplatelets (GNPs) were added to two different solid solution systems (Zr0.25Ti0.75B2 and Zr0.58Ti0.42B2) without affecting the complete solid solubility of these systems. All powder mixtures were densified by spark plasma sintering at 1800 °C, under 50 MPa with 5 min holding time. The densification, oxidation behavior, microstructure, phases, and mechanical properties (Vickers hardness and indentation fracture toughness) of these samples were systematically investigated. The formation of solid solutions caused an increase in the Vickers hardness and fracture toughness of the samples. Further improvement in mechanical properties and better oxidation resistance were achieved with the addition of GNPs to the solid solution systems.

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