Effects of graphene nanoplatelets and hexagonal boron nitride on spark plasma sintered (Zr,Nb)B2 solid solutions

Melis Kaplan Akarsu; Ipek Akin

doi:10.1016/j.jallcom.2021.161110

Effects of graphene nanoplatelets and hexagonal boron nitride on spark plasma sintered (Zr,Nb)B₂ solid solutions

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

9 Citations (Scopus)

Abstract

Bulk (Zr_xNb_1−x)B₂ solid solution systems with x ranging from 0 to 1 with intervals of 0.25, were consolidated by spark plasma sintering (SPS) at 1850 °C under 50 MPa with a holding time of 5 min. In addition, 1 vol% graphene nanoplatelets (GNPs) and 1 vol% hexagonal boron nitride (h-BN) were added to (Zr,Nb)B₂ solid solutions to investigate their effects on densification, mechanical properties, and optical properties. Transmission electron microscopy analysis, phase analysis, and lattice parameters confirmed the formation of a complete (Zr,Nb)B₂ solid solution. Raman analysis confirmed the structural integrity of both the GNPs and h-BN in the solid solution. The additives modified different properties of the (Zr,Nb)B₂ solid solution. Namely, the addition of GNPs increased the relative density by ~2% by removing oxide impurities. The highest Vickers hardness was obtained for h-BN-modified Zr_0.25Nb_0.75B₂, which had the lowest grain size. The addition of GNPs and h-BN contributed to the improvement in toughness by activating toughening mechanisms. The h-BN-modified (Zr,Nb)B₂ exhibited the best oxidation performance. The optical absorbance of the (Zr,Nb)B₂ solid solution was higher than that of the GNP- and h-BN-modified samples.

Original language	English
Article number	161110
Journal	Journal of Alloys and Compounds
Volume	884
DOIs	https://doi.org/10.1016/j.jallcom.2021.161110
Publication status	Published - 5 Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

Funding

Authors thank Prof. Dr. G. Goller for production and characterization facilities, Prof. Dr. M. Urgen for reflectance measurements, MSGSU Merlab (Dr. O. Ormanci) for Raman analysis, and H. Sezer for microstructural investigations. Also, the authors thank to Selcuk University, Advanced Technology Research and Application Center for TEM investigations. 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 Priority Areas Doctoral Scholarship and 100/2000 Ph.D. Scholarship, respectively. This work was supported by the Istanbul Technical University [grant number BAP-42163 , project code: MDK-2019-42163].

Funders	Funder number
Council of High Education
TUBITAK
YOK
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik Üniversitesi	BAP-42163, MDK-2019-42163

Keywords

Borides
GNP
H-BN
Solid solution
Spark plasma sintering

Access to Document

10.1016/j.jallcom.2021.161110

Cite this

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title = "Effects of graphene nanoplatelets and hexagonal boron nitride on spark plasma sintered (Zr,Nb)B2 solid solutions",

abstract = "Bulk (ZrxNb1−x)B2 solid solution systems with x ranging from 0 to 1 with intervals of 0.25, were consolidated by spark plasma sintering (SPS) at 1850 °C under 50 MPa with a holding time of 5 min. In addition, 1 vol% graphene nanoplatelets (GNPs) and 1 vol% hexagonal boron nitride (h-BN) were added to (Zr,Nb)B2 solid solutions to investigate their effects on densification, mechanical properties, and optical properties. Transmission electron microscopy analysis, phase analysis, and lattice parameters confirmed the formation of a complete (Zr,Nb)B2 solid solution. Raman analysis confirmed the structural integrity of both the GNPs and h-BN in the solid solution. The additives modified different properties of the (Zr,Nb)B2 solid solution. Namely, the addition of GNPs increased the relative density by ~2% by removing oxide impurities. The highest Vickers hardness was obtained for h-BN-modified Zr0.25Nb0.75B2, which had the lowest grain size. The addition of GNPs and h-BN contributed to the improvement in toughness by activating toughening mechanisms. The h-BN-modified (Zr,Nb)B2 exhibited the best oxidation performance. The optical absorbance of the (Zr,Nb)B2 solid solution was higher than that of the GNP- and h-BN-modified samples.",

keywords = "Borides, GNP, H-BN, Solid solution, Spark plasma sintering",

author = "Akarsu, {Melis Kaplan} and Ipek Akin",

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