TY - JOUR
T1 - Production and characterization of spark plasma sintered (Ti,Nb)B2 solid solutions with graphene nanoplatelets and hexagonal boron nitride
AU - Kaplan Akarsu, Melis
AU - Akin, Ipek
N1 - Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.
PY - 2023/2/15
Y1 - 2023/2/15
N2 - For this study, (Ti,Nb)B2 solid solutions were consolidated by spark plasma sintering. In addition, (Ti,Nb)B2 with graphene nanoplatelets (GNPs) and hexagonal boron nitride (h-BN) were produced to evaluate the potential of the new structural materials. The phase formation, microstructure, mechanical properties, oxidation resistance and room temperature reflectance, and absorbance features of (Ti,Nb)B2 were investigated. X-ray diffraction and Transmission electron microscopy observations showed that a complete solid solution phase was formed when the samples were sintered at 1850 °C for 5 min under 50 MPa. Ti0.75Nb0.25B2 exhibited a relative density of ∼98.6%, a hardness of ∼20.5 GPa, and an indentation fracture toughness of ∼3.4 MPa·m1/2. It was found that the presence of 1 vol% h-BN as an additive enhanced the hardness (∼10%) and fracture toughness (∼30%) of Ti0.75Nb0.25B2 by activating toughening mechanisms. The GNP added Ti0.75Nb0.25B2 proved to have better oxidation resistance and optical absorbance than the other materials used in the study.
AB - For this study, (Ti,Nb)B2 solid solutions were consolidated by spark plasma sintering. In addition, (Ti,Nb)B2 with graphene nanoplatelets (GNPs) and hexagonal boron nitride (h-BN) were produced to evaluate the potential of the new structural materials. The phase formation, microstructure, mechanical properties, oxidation resistance and room temperature reflectance, and absorbance features of (Ti,Nb)B2 were investigated. X-ray diffraction and Transmission electron microscopy observations showed that a complete solid solution phase was formed when the samples were sintered at 1850 °C for 5 min under 50 MPa. Ti0.75Nb0.25B2 exhibited a relative density of ∼98.6%, a hardness of ∼20.5 GPa, and an indentation fracture toughness of ∼3.4 MPa·m1/2. It was found that the presence of 1 vol% h-BN as an additive enhanced the hardness (∼10%) and fracture toughness (∼30%) of Ti0.75Nb0.25B2 by activating toughening mechanisms. The GNP added Ti0.75Nb0.25B2 proved to have better oxidation resistance and optical absorbance than the other materials used in the study.
KW - Borides
KW - GNP
KW - Solid solution
KW - h-BN
UR - http://www.scopus.com/inward/record.url?scp=85140094707&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2022.10.155
DO - 10.1016/j.ceramint.2022.10.155
M3 - Article
AN - SCOPUS:85140094707
SN - 0272-8842
VL - 49
SP - 5582
EP - 5594
JO - Ceramics International
JF - Ceramics International
IS - 4
ER -