TY - JOUR
T1 - Spark plasma sintered ZrC-TiC-GNP composites
T2 - Solid solution formation and mechanical properties
AU - Ocak, Burak Cagri
AU - Yavas, Baris
AU - Akin, Ipek
AU - Sahin, Filiz
AU - Goller, Gultekin
N1 - Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - Graphene nanoplatelets were incorporated into (20-x)TiC-80ZrC(vol%) composite powder with x = 0, 0.5, 1, 2, 3, 6 and 9 vol% contents. The resulting powder mixture were sintered by spark plasma sintering (SPS) at 1700 °C under 40 MPa with 300 s holding time. The prepared composites were then characterized in terms of their densification, microstructure, mechanical properties and phase analysis. By the identification of phases by X-ray analysis, it is verified that Zr4+ ions in the crystal lattice replaced by Ti4+ ions and the substituted solid solution was formed. Almost fully dense ZrC-TiC-GNP composites containing 3 vol% GNP was obtained with a relative density of more than 99%. Vickers microhardness decreased with increasing GNP content, and ZrC-TiC-GNP containing 9 vol% GNP had the lowest value as 13 GPa. On the other hand, fracture toughness increased with increasing GNP content up to 3 vol%, and the maximum fracture toughness value was 5.17 MPa m1/2.
AB - Graphene nanoplatelets were incorporated into (20-x)TiC-80ZrC(vol%) composite powder with x = 0, 0.5, 1, 2, 3, 6 and 9 vol% contents. The resulting powder mixture were sintered by spark plasma sintering (SPS) at 1700 °C under 40 MPa with 300 s holding time. The prepared composites were then characterized in terms of their densification, microstructure, mechanical properties and phase analysis. By the identification of phases by X-ray analysis, it is verified that Zr4+ ions in the crystal lattice replaced by Ti4+ ions and the substituted solid solution was formed. Almost fully dense ZrC-TiC-GNP composites containing 3 vol% GNP was obtained with a relative density of more than 99%. Vickers microhardness decreased with increasing GNP content, and ZrC-TiC-GNP containing 9 vol% GNP had the lowest value as 13 GPa. On the other hand, fracture toughness increased with increasing GNP content up to 3 vol%, and the maximum fracture toughness value was 5.17 MPa m1/2.
KW - Graphene nanoplatelets
KW - Solid solution
KW - Spark plasma sintering
KW - Titanium carbide
KW - Zirconium carbide
UR - http://www.scopus.com/inward/record.url?scp=85033704894&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2017.10.200
DO - 10.1016/j.ceramint.2017.10.200
M3 - Article
AN - SCOPUS:85033704894
SN - 0272-8842
VL - 44
SP - 2336
EP - 2344
JO - Ceramics International
JF - Ceramics International
IS - 2
ER -