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Journal of Materials Science

, Volume 53, Issue 12, pp 8989–9001 | Cite as

Sintering and tribomechanical properties of gel-combustion-derived nano-alumina and its composites with carbon nanotubes

  • Rupa Halder
  • Soumya Sarkar
  • Siddhartha Bandyopadhyay
  • Pravash C. Chakraborti
Composites
  • 131 Downloads

Abstract

Fully pure nano-α-alumina (Al2O3) was prepared following gel-combustion method. Near theoretically dense monolithic Al2O3 and its composites reinforced with multiwalled carbon nanotubes (MWCNTs) were prepared using spark plasma sintering (SPS) at 1500 °C under 40 MPa within 10 min. The shrinkage curves were guided in sequence by the crystallization of the amorphous mass followed by a solid-state sintering. The differential nature of electrical conductivity of both composite phases resulted in enhanced densification through localized joule heating. Formation of ~ 1-μm-sized equiaxed matrix grains with uniform distribution of structurally survived CNTs in it was observed in the sintered composites. Within the investigated loading span, the highest Vickers hardness (HV) values were obtained only at 0.5 wt% MWCNT loading in matrix Al2O3. Improvements in HV values for the composites at 0.2 and 2 kgf indentation loads were found to be ~ 18 and ~ 12%, respectively, in comparison with those obtained for pure matrix phase. Quantitative indentation size effect analyzed through standard mathematical models indicated the role of matrix grain refinement and proper matrix–filler load sharing in changing the true hardness. On the contrary, increased CNT concentration leaded to increased sensitivity toward size effect due to the extreme flexible nature of the filler. Unlubricated linear scratch experiments revealed ~ 30–45% lower specific wear rate (WR) values of the composite specimens compared to SPS-processed monolithic Al2O3. Microstructure and scar profile observations were utilized to describe such enhanced wear resistance of present composites.

Notes

Acknowledgements

The first author conveys sincere thanks to CSIR for Research Associate position. Helps from the institutional characterization units are gratefully acknowledged. Thanks are due to the Director of CSIR-Central Glass & Ceramic Research Institute, for his interest.

Funding

This study was funded by Council of Scientific and Industrial Research (CSIR), India (Grant Number: MLP-0202).

Compliance with ethical standards

Conflicts of interest

The authors have no conflicts of interest related to this work.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Rupa Halder
    • 1
  • Soumya Sarkar
    • 1
  • Siddhartha Bandyopadhyay
    • 1
  • Pravash C. Chakraborti
    • 2
  1. 1.CSIR- Central Glass and Ceramic Research InstituteKolkataIndia
  2. 2.Metallurgical and Material EngineeringJadavpur UniversityKolkataIndia

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