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

B. Bhatt; Murthy Tammana; K. Singh; A. Sashanka; B. Vishwanadh; J. K. Sonber; K. Sairam; G. V.S. Nageswara Rao; T. Srinivasa Rao; Vivekanand Kain

doi:10.1007/s11665-017-2922-1

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

B. Bhatt, Murthy Tammana, K. Singh, A. Sashanka, B. Vishwanadh, J. K. Sonber, K. Sairam, G. V.S. Nageswara Rao^*, T. Srinivasa Rao, Vivekanand Kain

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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 m^1/2 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.

Original language	English
Pages (from-to)	5043-5055
Number of pages	13
Journal	Journal of Materials Engineering and Performance
Volume	26
Issue number	10
Early online date	13 Sept 2017
DOIs	https://doi.org/10.1007/s11665-017-2922-1
Publication status	Published - 1 Oct 2017

Keywords

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

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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10.1007/s11665-017-2922-1Licence: None: All rights reserved

https://link.springer.com/article/10.1007%2Fs11665-017-2922-1Licence: None: All rights reserved

Cite this

Bhatt, B., Tammana, M., Singh, K., Sashanka, A., Vishwanadh, B., Sonber, J. K., Sairam, K., Nageswara Rao, G. V. S., Srinivasa Rao, T., & Kain, V. (2017). Scratch Testing of Hot-Pressed Monolithic Chromium Diboride (CrB₂) and CrB₂ + MoSi₂ Composite. Journal of Materials Engineering and Performance, 26(10), 5043-5055. Advance online publication. https://doi.org/10.1007/s11665-017-2922-1

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title = "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.",

keywords = "ceramic matrix composite, chromium diboride, electron microscopy, friction, molybdenum disilicide, scratch test, wear mechanism",

author = "B. Bhatt and Murthy Tammana and K. Singh and A. Sashanka and B. Vishwanadh and Sonber, {J. K.} and K. Sairam and {Nageswara Rao}, {G. V.S.} and {Srinivasa Rao}, T. and Vivekanand Kain",

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AU - Bhatt, B.

AU - Tammana, Murthy

AU - Singh, K.

AU - Sashanka, A.

AU - Vishwanadh, B.

AU - Sonber, J. K.

AU - Sairam, K.

AU - Nageswara Rao, G. V.S.

AU - Srinivasa Rao, T.

AU - Kain, Vivekanand

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N2 - 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.

AB - 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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KW - chromium diboride

KW - electron microscopy

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KW - molybdenum disilicide

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