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Scratch Testing of Hot-Pressed Monolithic Chromium Diboride (CrB2) and CrB2 + MoSi2 Composite

Abstract

The tribological performance of hot-pressed monolithic CrB2 and a newly developed CrB2 + 20 vol.% MoSi2 composite was investigated by using scratch test. The test was carried out under progressive loading ranging from 0.9 to 30 N over a scratch distance of 3 mm. In situ values of coefficient of friction (COF), depth of penetration and acoustic emission were recorded. The wear volume and fracture toughness were also calculated. COF of both materials is increased with increasing the scratch length and progressive load. COF of the composite was observed to be slightly higher compared to the monolithic CrB2. The wear volume of the composite is 60% higher compared to monolithic CrB2. Fracture toughness values of ~2.48 and ~2.81 MPa m1/2 were calculated for monolithic CrB2 and CrB2 + 20 vol.% MoSi2 composite, respectively. Microstructural characterization indicates that the abrasive wear is the dominant wear mechanism in both the materials.

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Acknowledgment

The financial support by Board of Research in Nuclear Science (BRNS) of the Department of Atomic Energy (DAE), Government of India (No.2013/36/15-BRNS) is gratefully acknowledged.

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Correspondence to G. V. S. Nageswara Rao.

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Bhatt, B., Murthy, T.S.R.C., Singh, K. et al. Scratch Testing of Hot-Pressed Monolithic Chromium Diboride (CrB2) and CrB2 + MoSi2 Composite. J. of Materi Eng and Perform 26, 5043–5055 (2017). https://doi.org/10.1007/s11665-017-2922-1

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  • DOI: https://doi.org/10.1007/s11665-017-2922-1

Keywords

  • ceramic matrix composite
  • chromium diboride
  • electron microscopy
  • friction
  • molybdenum disilicide
  • scratch test
  • wear mechanism