TY - JOUR
T1 - Thermal diffusivity and microstructure of spark plasma sintered TiB 2 [sbnd]SiC[sbnd]Ti composite
AU - Vajdi, Mohammad
AU - Sadegh Moghanlou, Farhad
AU - Ahmadi, Zohre
AU - Motallebzadeh, Amir
AU - Shahedi Asl, Mehdi
N1 - Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.
PY - 2019/5
Y1 - 2019/5
N2 - This work investigates the microstructural development, thermal properties and phase evolution of spark plasma sintered TiB 2 [sbnd]SiC[sbnd]Ti (TST) ceramic composite. A fully dense TiB 2 –30 vol% SiC composite, doped with 5 wt% Ti, was sintered by spark plasma at 1900 °C for 6 min under 35 MPa pressure in vacuum. The XRD analysis and thermodynamic assessments verified the in-situ synthesis of TiB, TiC and TiSi 2 compounds during the sintering process due to the chemical reaction of Ti additive with the SiC reinforcement. The TST composite showed higher thermal conductivity than the monolithic TiB 2 at low temperatures, however, a reverse trend was observed at higher temperatures. The governing equation of heat diffusion through a cutting tool, made of monolithic TiB 2 and TST, was solved by finite element method and the temperature distribution was obtained. The results showed that TST composite has lower value of maximum temperature compared to the reported values for WC. Cutting tools with lower temperatures result in higher accuracy and more tool lifespan.
AB - This work investigates the microstructural development, thermal properties and phase evolution of spark plasma sintered TiB 2 [sbnd]SiC[sbnd]Ti (TST) ceramic composite. A fully dense TiB 2 –30 vol% SiC composite, doped with 5 wt% Ti, was sintered by spark plasma at 1900 °C for 6 min under 35 MPa pressure in vacuum. The XRD analysis and thermodynamic assessments verified the in-situ synthesis of TiB, TiC and TiSi 2 compounds during the sintering process due to the chemical reaction of Ti additive with the SiC reinforcement. The TST composite showed higher thermal conductivity than the monolithic TiB 2 at low temperatures, however, a reverse trend was observed at higher temperatures. The governing equation of heat diffusion through a cutting tool, made of monolithic TiB 2 and TST, was solved by finite element method and the temperature distribution was obtained. The results showed that TST composite has lower value of maximum temperature compared to the reported values for WC. Cutting tools with lower temperatures result in higher accuracy and more tool lifespan.
KW - Finite element method
KW - Microstructure
KW - Spark plasma sintering
KW - Thermal diffusivity
KW - TiB –SiC
KW - Titanium dopant
UR - http://www.scopus.com/inward/record.url?scp=85060601867&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2019.01.141
DO - 10.1016/j.ceramint.2019.01.141
M3 - Article
AN - SCOPUS:85060601867
SN - 0272-8842
VL - 45
SP - 8333
EP - 8344
JO - Ceramics International
JF - Ceramics International
IS - 7
ER -