TY - JOUR
T1 - Effects of graphene nanoplatelets and hexagonal boron nitride on spark plasma sintered (Zr,Nb)B2 solid solutions
AU - Akarsu, Melis Kaplan
AU - Akin, Ipek
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/12/5
Y1 - 2021/12/5
N2 - 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.
AB - 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.
KW - Borides
KW - GNP
KW - H-BN
KW - Solid solution
KW - Spark plasma sintering
UR - http://www.scopus.com/inward/record.url?scp=85109856051&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2021.161110
DO - 10.1016/j.jallcom.2021.161110
M3 - Article
AN - SCOPUS:85109856051
SN - 0925-8388
VL - 884
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 161110
ER -