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Research Papers: Friction and Wear

Mechanical and Tribological Properties of Spark Plasma Sintered SiC–TiB2 and SiC–TiB2–TaC Composites: Effects of Sintering Temperatures (2000 °C and 2100 °C)

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

Tribology Laboratory,
National Institute of Technology Srinagar,
Hazrtabal,
Srinagar 190006, Jammu and Kashmir, India

D. Debnath, S. Chakraborty, P. K. Das

Non-Oxide Ceramic Laboratory,
Central Glass and Ceramics Research Institute,
Kolkata 700032, India

M. F. Wani

Tribology Laboratory,
National Institute of Technology Srinagar,
Hazrtabal,
Srinagar 190006, Jammu and Kashmir, India
e-mail: mfwani@nitsri.net

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 16, 2016; final manuscript received May 13, 2017; published online August 22, 2017. Assoc. Editor: Nuria Espallargas.

J. Tribol 140(1), 011608 (Aug 22, 2017) (10 pages) Paper No: TRIB-16-1388; doi: 10.1115/1.4037068 History: Received December 16, 2016; Revised May 13, 2017

SiC–TiB2 (10 wt. %) and SiC–TiB2 (10 wt. %)–TaC (5 wt. %) composites are consolidated using spark plasma sintering (SPS) technique at different sintering temperatures (2000 °C and 2100 °C) 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 silicon carbide (SiC) sintered at 2100 °C is improved with addition of titanium diboride (TiB2) and tantalum carbide (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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Figures

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Fig. 1

Effects of sintering temperature on the relative density(%) of SiC, TiB2, TaC, SiC–TiB2, and SiC–TiB2–TaC compositions

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Fig. 2

XRD patterns of (a) SiC–TiB2 and (b) SiC–TiB2–TaC composites spark plasma sintered at different sintering temperatures (2000 °C and 2100 °C)

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Fig. 3

Field emission scanning electron microscope (FESEM) microstructures of (a) SiC and (b) SiC–TiB2–TaC composite and fracture surfaces of (c) SiC and (d) SiC–TiB2 composite, SPS sintered at 2100 °C

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Fig. 4

EDS elemental mapping of (a) SiC and (b) SiC–TiB2 compositions spark plasma sintered at 2100 °C

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Fig. 5

Optical micrograph of indentation at 1 kgf load of (a) SiC, (b) TiB2, (c) TaC, (d) SiC–TiB2, and (e) SiC–TiB2–TaC compositions, spark plasma sintered at 2100 °C

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Fig. 6

Toughness mechanism of SiC–TiB2 composite (SPS at 2100 °C) by crack deflection around TiB2 particle

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Fig. 7

SEM micrographs of micro-indentation and crack tracks of SiC–TiB2 composite spark plasma sintered at 2100 °C under (a) 0.5 kgf and (b) 1 kgf loads

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Fig. 8

Coefficient of friction values of (a) Monolithic SiC, TiB2, and TaC, and (b) Composite SiC–TiB2 and SiC–TiB2–TaC spark plasma sintered at different temperatures under 5 N and 10 N loads

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Fig. 9

Frictional plots of monolithic (a) SiC (2000), (b) SiC (2100), (c) TiB2 (2000), (d) TiB2 (2100), (e) TaC (2000), and (f) TaC (2100), under different loads (5 N and 10 N)

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Fig. 10

Frictional plots of composite (a) SiC–TiB2 (2000), (b) SiC–TiB2 (2100), (c) SiC–TiB2–TaC (2000), and (d) SiC–TiB2–TaC (2100), under different loads (5 N and 10 N)

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Fig. 11

Three-dimensional surface topography of wear track for SiC–TiB2 composite, SPS sintered at 2100 °C under 5 N and 10 N loads

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Fig. 12

Scratch track SEM micrograph of SiC–TiB2 composite (SPS at 2100 °C) at (a) 5 N and (b) 10 N loads

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Fig. 13

Thermal properties of monolithic (a) SiC, (b) TiB2, and (c) TaC system, spark plasma sintered at 2100 °C

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Fig. 14

Thermal properties of (a) SiC–TiB2 and (b) SiC–TiB2–TaC composites system, spark plasma sintered at 2100 °C

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