Fracture toughness and sliding properties of magnetron sputtered CrBC and CrBCN coatings
Fracture toughness and sliding properties of magnetron sputtered CrBC and CrBCN coatings
CrBC and CrBCN coatings with low and high B contents were deposited on 316L steel and Si wafers using an unbalanced magnetron sputtering system. Mechanical properties including hardness (H), elastic modulus (E) and fracture toughness (KIc) as well as residual stresses (σ) were quantified. A clear correlation between structural, mechanical and tribological properties of coatings was found. In particular, structural analyses indicated that N incorporation in CrBC coatings with high B content caused a significant structural evolution of the nanocomposite structure (crystalline grains embedded into an amorphous matrix) from nc-CrB2/(a-CrBx, a-BCx) to nc-CrN/(a-BCx, a-BN). As a result, the hardness of CrBC coating with high B content decreased from 23.4 to 16.3 GPa but the fracture toughness was enhanced. Consequently, less cracks initiated on CrBCN coatings during tribological tests, which combined with the shielding effect of a-BN on wear debris, led to a low friction coefficient and wear rate.
CrBCN, fracture toughness, sliding properties, ceramic bearings, wear mechanism
Wang, Qianzhi
77e7c22e-979a-4857-aeb9-aff588955043
Zhou, Fei
cc1f79df-c055-4cfa-873a-1e3f954039cd
Ma, Qiang
2db214be-cd4d-4d13-8709-e69e71eecd30
Callisti, Mauro
86e03724-aacc-46d5-bccc-4c7025556667
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Yan, Jiwang
ffc4a4e7-673f-4931-99f4-a933fa28f362
Wang, Qianzhi
77e7c22e-979a-4857-aeb9-aff588955043
Zhou, Fei
cc1f79df-c055-4cfa-873a-1e3f954039cd
Ma, Qiang
2db214be-cd4d-4d13-8709-e69e71eecd30
Callisti, Mauro
86e03724-aacc-46d5-bccc-4c7025556667
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Yan, Jiwang
ffc4a4e7-673f-4931-99f4-a933fa28f362
Wang, Qianzhi, Zhou, Fei, Ma, Qiang, Callisti, Mauro, Polcar, Tomas and Yan, Jiwang
(2018)
Fracture toughness and sliding properties of magnetron sputtered CrBC and CrBCN coatings.
Applied Surface Science.
(doi:10.1016/j.apsusc.2018.02.276).
Abstract
CrBC and CrBCN coatings with low and high B contents were deposited on 316L steel and Si wafers using an unbalanced magnetron sputtering system. Mechanical properties including hardness (H), elastic modulus (E) and fracture toughness (KIc) as well as residual stresses (σ) were quantified. A clear correlation between structural, mechanical and tribological properties of coatings was found. In particular, structural analyses indicated that N incorporation in CrBC coatings with high B content caused a significant structural evolution of the nanocomposite structure (crystalline grains embedded into an amorphous matrix) from nc-CrB2/(a-CrBx, a-BCx) to nc-CrN/(a-BCx, a-BN). As a result, the hardness of CrBC coating with high B content decreased from 23.4 to 16.3 GPa but the fracture toughness was enhanced. Consequently, less cracks initiated on CrBCN coatings during tribological tests, which combined with the shielding effect of a-BN on wear debris, led to a low friction coefficient and wear rate.
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1-s2.0-S0169433218306391-main
- Accepted Manuscript
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APSUSC-S-17-17213
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Accepted/In Press date: 28 February 2018
e-pub ahead of print date: 1 March 2018
Keywords:
CrBCN, fracture toughness, sliding properties, ceramic bearings, wear mechanism
Identifiers
Local EPrints ID: 418562
URI: http://eprints.soton.ac.uk/id/eprint/418562
ISSN: 0169-4332
PURE UUID: 555a4261-2c35-4e48-8862-976a12206ab6
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Date deposited: 12 Mar 2018 17:30
Last modified: 16 Mar 2024 06:18
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Contributors
Author:
Qianzhi Wang
Author:
Fei Zhou
Author:
Qiang Ma
Author:
Mauro Callisti
Author:
Jiwang Yan
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