Coating optimisation for high speed machining with advanced nanomechanical test methods

Beake, Ben D.; Fox-Rabinovich, German; Veldhuis, Stephen C.; Goodes, Stephen R.

doi:10.1016/j.surfcoat.2009.01.025

Cited by 116 publications

(75 citation statements)

References 45 publications

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“…Plastic flow can be considered as the major source of stress relaxation in the coating system. Although plasticity is not the same as toughness, as discussed in detail elsewhere [19,21,[26][27][28], nevertheless in practice it appears that the two properties are well correlated. Where high 15 fracture toughness is associated with high H 3 /E 2 then this appears to be a consequence of the higher load-support (the critical load for plastic flow is connected to H 3 /E 2 ) so that for a given load the total deformation is lower so the bending stresses in the coating are reduced rather than intrinsic structural toughening.…”

Section: Nanoindentation and Plasticitymentioning

confidence: 93%

“…At low relative indentation depth the substrate contribution is minimal and the observed differences in x are due to differences in coating properties. FE analysis has predicted x ~5 [17][18] whilst for bulk materials experimental evidence suggests that x ~ 5 for glasses and x ~6-7 for metals [19][20]. For hard coating systems x has been reported to be ~6.4 on TiN-based nanocomposites [21] and 5.7 on TiAlCrN/TiAlCrSiYN multilayers [22].…”

Section: Nanoindentation and Plasticitymentioning

confidence: 99%

“…Based on theoretical and experimental studies it has been suggested that PI, h r /h m and H/E 14 essentially contain the same information and can be used interchangeably [19][20]. However, although they are well correlated there appear to be some subtle differences.…”

Section: Nanoindentation and Plasticitymentioning

confidence: 99%

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Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

Beake

Liskiewicz

Vishnyakov

et al. 2015

Surface and Coatings Technology

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DLC coatings can combine high hardness with low friction. However, they are often deposited with high levels of intrinsic stress and display low adhesion strength resulting in poor performance in demanding applications. A highly topical challenge is to develop advanced DLC coatings capable of withstanding more demanding applications in the automotive, cutting tools, MEMS and oil and gas sectors. The results from several nanomechanical and tribological test techniques -nanoindentation, nano-scratch and nanofretting (nano-wear) -can be used together to aid the design of DLC coating architectures for enhanced durability in specific applications. In this study the behaviour of multilayered DLC coatings (Cr/W-C:H/a-C:H, Cr/W-C:H/Si-a-C:H) was compared to that of CrN/a-C:H:W (WC/C). We have previously reported that in nano-wear tests the coating with the highest hardness and H/E displayed greater wear resistance [T.W. Liskiewicz et al, Surf. Coat.Technol. 237 (2013) 212]. By employing nano-and micro-scale tribological testing with probes of differing sharpness it is possible to change the sensitivity of the test to probe the response of the coating top layer or the entire multilayer coating-substrate system. In the nano-scratch tests using a spherical indenter with a 5 m end radius the maximum stresses are located well within the top layer of the multilayer coatings and consequently the mechanical properties of this top layer dominate the nano-tribological behaviour. In the micro-scratch using a 25 m spherical probe the stress field extends further towards the sublayers and steel substrate and consequently the behaviour is completely different. Under these conditions the coating with the lowest hardness and H/E showed improved performance with higher critical loads for cracking and total coating failure. High resolution SEM imaging has been used to investigate this further. A simple contact model strongly suggests that cracking and failure events occur on the harder coatings when the maximum von Mises stress was located close to the interfaces in the multilayer systems.3

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Section: Nanoindentation and Plasticitymentioning

confidence: 93%

Section: Nanoindentation and Plasticitymentioning

confidence: 99%

See 1 more Smart Citation

Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

Beake

Liskiewicz

Vishnyakov

et al. 2015

Surface and Coatings Technology

Self Cite

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show abstract

“…[4][5][6][7][8][9][10][11][12][13][14][15][16]. These investigations take advantage of the features in the real time force-displacement (P-h), displacement-time (h-t) or stiffness curves recorded during repeated loading/unloading of bulk materials and thin films.…”

Section: Introductionmentioning

confidence: 99%

“…Test methodologies and data analysis techniques adapted in previous investigations can be categorised in three main areas. The first one is depth sensing as indicated by Beake et al [5][6][7][8][9] where a sudden increase in contact depth vs. time or number of impacts indicate the failure of component or film. The second one is area based calculations as indicated by Bouzakis et al [10][11] where the fracture ratio of failed area and undamaged film indicates film failure.…”

Section: Introductionmentioning

confidence: 99%