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Mechanical and Tribological properties of spark plasma sintered SiC/TiB2 and SiC/TiB2/TaC composites: Effects of sintering temperatures (2000?C & 2100?C)

[+] Author and Article Information
H. K. Pant

Tribology Laboratory, National Institute of Technology Srinagar, Hazrtabal, Srinagar-190006, J&K, India
hemantpant13@gmail.com

D. Debnath

Central Glass and Ceramics Research Institute, Kolkata-700032, India
debnath.debashish90@gmail.com

S. chakraborty

Central Glass and Ceramics Research Institute, Kolkata-700032, India
shirshendu@cgcri.res.in

Mohd Farooq Wani

Tribology Laboratory, National Institute of Technology Srinagar, Hazrtabal, Srinagar-190006, J&K, India
mfwani@nitsri.net

P.K. Das

Central Glass and Ceramics Research Institute, Kolkata-700032, India
probalkdas@rediffmail.com

1Corresponding author.

ASME doi:10.1115/1.4037068 History: Received December 16, 2016; Revised May 13, 2017

Abstract

SiC-TiB2 (10 wt.%) and SiC-TiB2 (10 wt.%)-TaC (5 wt.%) composites are consolidated using spark plasma sintering technique at different sintering temperatures (2000oC and 2100oC) for 15 min soaking time under 35 MPa pressure. The effects of sintering temperature on densification and mechanical properties of composites have been investigated in detail. SiC-TiB2 and SiC-TiB2-TaC composites sintered at 2100°C showed high Vickers hardness value i.e. 27.20±1.23 GPa and 26.40±0.80 GPa, respectively under 1 kgf (9.81 N) load. Poor fracture toughness {2.28 MPa(m)1/2 at 1 kgf (9.81 N) load} of monolithic SiC sintered at 2100°C is improved with addition of TiB2 and TaC as secondary phases. Scratch resistance of SiC-TiB2 and SiC-TiB2-TaC composites show coefficient of friction value below 0.40 and 0.50 under 5 N and 10 N loads, respectively. SiC-TiB2 and SiC-TiB2-TaC composites show constant thermal conductivity response above 810°C and 603°C in the range of 48.70-47.15 W/m?K and 60.35-60.41 W/m?K, respectively.

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