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

Melis Kaplan Akarsu, Ipek Akin*

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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.

Orijinal dilİngilizce
Makale numarası161110
DergiJournal of Alloys and Compounds
Yayın durumuYayınlandı - 5 Ara 2021

Bibliyografik not

Publisher Copyright:
© 2021 Elsevier B.V.


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].

FinansörlerFinansör numarası
Council of High Education
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik ÜniversitesiBAP-42163, MDK-2019-42163

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