An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings

Chuan Ting Wang (Corresponding Author), Timo J. Hakala, Anssi Laukkanen, Helena Ronkainen, Kenneth Holmberg, Nong Gao, Robert J.K. Wood, Terence G. Langdon

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

TiN and diamond-like carbon (DLC) coatings were deposited on Ti substrates with and without processing by high-pressure torsion (HPT). The HPT processing refined the grain size of titanium from the coarse-grained (CG) size of ~8.6 µm to the ultra-fine grained (UFG) size of ~130 nm and increased the hardness from ~1.83 to ~3.05 GPa. Scratch test results revealed that all the thin hard coatings had a higher critical load when deposited on the harder UFG Ti substrate compared to those deposited on the softer CG Ti. A three-dimensional finite element model (3D FEM) revealed that the improved load-carrying property of the thin hard coatings on the harder titanium substrates was related to the higher stresses generated within the substrate and its deformation behaviour which reduced the strain at the coating/substrate interface. A model based on the hardness of a two-layered composite was used to explain this effect, and it is shown that the model is reasonably successful in predicting the critical load of a wide range of coating-substrate systems. The analytical model and the results of the 3D FEM modelling emphasize the contribution of the substrate to the load-bearing capacity of thin coatings.
Original languageEnglish
Pages (from-to)4390-4398
JournalJournal of Materials Science
Volume51
Issue number9
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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Hard coatings
Bearing capacity
Loads (forces)
Substrates
Coatings
Titanium
Torsional stress
Hardness
Finite element method
Diamond
Processing
Analytical models
Diamonds
Carbon
Composite materials

Keywords

  • ProperTune

Cite this

Wang, Chuan Ting ; Hakala, Timo J. ; Laukkanen, Anssi ; Ronkainen, Helena ; Holmberg, Kenneth ; Gao, Nong ; Wood, Robert J.K. ; Langdon, Terence G. / An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings. In: Journal of Materials Science. 2016 ; Vol. 51, No. 9. pp. 4390-4398.
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abstract = "TiN and diamond-like carbon (DLC) coatings were deposited on Ti substrates with and without processing by high-pressure torsion (HPT). The HPT processing refined the grain size of titanium from the coarse-grained (CG) size of ~8.6 µm to the ultra-fine grained (UFG) size of ~130 nm and increased the hardness from ~1.83 to ~3.05 GPa. Scratch test results revealed that all the thin hard coatings had a higher critical load when deposited on the harder UFG Ti substrate compared to those deposited on the softer CG Ti. A three-dimensional finite element model (3D FEM) revealed that the improved load-carrying property of the thin hard coatings on the harder titanium substrates was related to the higher stresses generated within the substrate and its deformation behaviour which reduced the strain at the coating/substrate interface. A model based on the hardness of a two-layered composite was used to explain this effect, and it is shown that the model is reasonably successful in predicting the critical load of a wide range of coating-substrate systems. The analytical model and the results of the 3D FEM modelling emphasize the contribution of the substrate to the load-bearing capacity of thin coatings.",
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An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings. / Wang, Chuan Ting (Corresponding Author); Hakala, Timo J.; Laukkanen, Anssi; Ronkainen, Helena; Holmberg, Kenneth; Gao, Nong; Wood, Robert J.K.; Langdon, Terence G.

In: Journal of Materials Science, Vol. 51, No. 9, 2016, p. 4390-4398.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings

AU - Wang, Chuan Ting

AU - Hakala, Timo J.

AU - Laukkanen, Anssi

AU - Ronkainen, Helena

AU - Holmberg, Kenneth

AU - Gao, Nong

AU - Wood, Robert J.K.

AU - Langdon, Terence G.

PY - 2016

Y1 - 2016

N2 - TiN and diamond-like carbon (DLC) coatings were deposited on Ti substrates with and without processing by high-pressure torsion (HPT). The HPT processing refined the grain size of titanium from the coarse-grained (CG) size of ~8.6 µm to the ultra-fine grained (UFG) size of ~130 nm and increased the hardness from ~1.83 to ~3.05 GPa. Scratch test results revealed that all the thin hard coatings had a higher critical load when deposited on the harder UFG Ti substrate compared to those deposited on the softer CG Ti. A three-dimensional finite element model (3D FEM) revealed that the improved load-carrying property of the thin hard coatings on the harder titanium substrates was related to the higher stresses generated within the substrate and its deformation behaviour which reduced the strain at the coating/substrate interface. A model based on the hardness of a two-layered composite was used to explain this effect, and it is shown that the model is reasonably successful in predicting the critical load of a wide range of coating-substrate systems. The analytical model and the results of the 3D FEM modelling emphasize the contribution of the substrate to the load-bearing capacity of thin coatings.

AB - TiN and diamond-like carbon (DLC) coatings were deposited on Ti substrates with and without processing by high-pressure torsion (HPT). The HPT processing refined the grain size of titanium from the coarse-grained (CG) size of ~8.6 µm to the ultra-fine grained (UFG) size of ~130 nm and increased the hardness from ~1.83 to ~3.05 GPa. Scratch test results revealed that all the thin hard coatings had a higher critical load when deposited on the harder UFG Ti substrate compared to those deposited on the softer CG Ti. A three-dimensional finite element model (3D FEM) revealed that the improved load-carrying property of the thin hard coatings on the harder titanium substrates was related to the higher stresses generated within the substrate and its deformation behaviour which reduced the strain at the coating/substrate interface. A model based on the hardness of a two-layered composite was used to explain this effect, and it is shown that the model is reasonably successful in predicting the critical load of a wide range of coating-substrate systems. The analytical model and the results of the 3D FEM modelling emphasize the contribution of the substrate to the load-bearing capacity of thin coatings.

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