Investigations on Mechanical and Tribological Behavior of dcMS/HPPMS CrN and (Cr,Al)N Hard Coatings Using Nanoscratch Technique

Bobzin, Kirsten; Brögelmann, Tobias; Kruppe, N.C.; Arghavani, Mostafa

doi:10.1002/adem.201600632

Cited by 24 publications

(9 citation statements)

References 73 publications

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“…A constant Poisson's ratio of υ = 0.25 was assumed for the coatings according to the previous work . In addition, the plastic work W pl and elastic work W el were determined from the nanoindentation force–displacement curves according to the previous work, to determine the ratio of plastic work to total work W pl / W total . The lower the ratio, the greater is the resistance to plastic deformation.…”

Section: Methodsmentioning

confidence: 99%

“…For this reason, there is an effort to combine TMD with a wear‐resistant hard phase to provide resistance to abrasive wear combined with friction reduction. The ternary coating system (Cr,Al)N deposited by PVD is a promising candidate for this purpose as it exhibits a high hardness, good abrasion wear resistance and high corrosion resistance . These coating systems can be deposited with PVD technologies such as direct current magnetron sputtering (DCMS) or high‐power pulsed magnetron sputtering (HPPMS).…”

Section: Introductionmentioning

confidence: 99%

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Self‐Lubricating Physical Vapor Deposition Coatings for Dry Cold Massive Forming

Bobzin

Brögelmann

Kruppe

et al. 2019

steel research int.

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Cold massive forming, particularly forward extrusion of steel, is characterized by high material utilization, product quality, and resource efficiency. Currently, enormous quantities of mostly ecologically harmful lubricants are required, leading to the demand for lubricant-free cold forming. Furthermore, cost savings are achievable due to shorter lead times. However, the requirements for the tools cannot be met without the application of wear-resistant and friction-reducing hard coatings. The self-lubricating hard coatings (Cr,Al)N þ Mo:S and (Cr,Al) N þ W:S with attuned material design deposited by physical vapor deposition (PVD) offer high potential for the realization of dry cold forming of steel. The process chain for the comprehensive characterization of the developed coating systems comprises analyses of coating and compound properties as well as two different model tests to determine the tribological behavior. One of the used tribometers represents an open tribological system, which is particularly suitable for simulating the loads occurring during cold massive forming of steel. The analyses reveal that with Mo and S modified coatings exhibit higher potential for ecologically sustainable cold forming due to their better mechanical properties and compound properties between the coatings and the cold work steel substrate compared with W and S modified coatings.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self‐Lubricating Physical Vapor Deposition Coatings for Dry Cold Massive Forming

Bobzin

Brögelmann

Kruppe

et al. 2019

steel research int.

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“…The four force-displacement curves analyzed show no distinct drop-ins, which would have indicated the formation of cracks underneath the indenter. As suggested in [12], since significant crack formation can therefore be neglected, an increased relative elastic work (W el /(W pl + W el )) can be interpreted as a higher resistance against plastic deformation.…”

Section: Coating Characterizationmentioning

confidence: 96%

Crack Resistance of Diamond‐Like Carbon Coatings

Bobzin¹,

Brögelmann²,

Carlet

et al. 2021

Vak Forsch Prax

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Summary The aim of the current paper is the study of the crack resistance of diamond‐like carbon (DCL) coatings deposited by direct current magnetron sputtering (dcMS) and high‐power pulse magnetron sputtering (HPPMS) with different process parameters. For this purpose nanoindentation with a very high force resolution of RFN ≤ 1 nN was used to analyze different a‐C coatings, which were deposited under variation of the process gases argon, helium and neon. Owing to significantly high force resolution of the indenter, a large number N = 31,872 of data points in each force‐displacement curve was recorded, which enabled the desired analyses. Based on the results, it can be stated that the nanoindentation is able to provide knowledge on the crack formation of DLC coatings. The coatings deposited with neon show a more promising behavior in point of elastic‐plastic properties. In addition, the evaluation of the force‐displacement curves indicates a higher resistance to crack formation of these coatings. Furthermore, investigations on the influence of the process gas pressure were conducted using Ne and three pressures p = 2.0 Pa, p = 1.5 Pa and p = 1.0 Pa. The results show that applying the moderate gas pressure can generate coatings with the highest toughness compared to the coatings deposited with higher and lower gas pressures.

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“…Investigations using scratch and Rockwell impact tests have shown that even brittle nitride coatings undergo plastic deformation not only under hydrostatic, concentrated loads as in indentation, but also under similar but dynamic loading conditions. The adhesion behaviour between coating and substrate can also be investigated in this way [12,[48][49][50][51], but several studies suggest that the mechanical properties of the coating, the tribological behaviour and the substrate/coating interface are interrelated [32,52]. For example, high resistance to plastic deformation also leads to improved abrasion resistance at the substrate/coating interface [52].…”

Section: Introductionmentioning

confidence: 99%

“…The adhesion behaviour between coating and substrate can also be investigated in this way [12,[48][49][50][51], but several studies suggest that the mechanical properties of the coating, the tribological behaviour and the substrate/coating interface are interrelated [32,52]. For example, high resistance to plastic deformation also leads to improved abrasion resistance at the substrate/coating interface [52]. To guide materials and process design, it is therefore important to characterise the coating itself, ideally revealing also the different possible fracture mechanisms individually with their respective critical stresses.…”

Section: Introductionmentioning

confidence: 99%

Orientation dependence of the fracture mechanisms in (V,Al)N coatings determined by micropillar compression

Schoof

Gibson

Aghda

et al. 2022

Journal of Materials Research

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Transition metal aluminium nitrides produced by physical vapour deposition are widely used as hard, protective coatings in the manufacturing industries. To optimise coatings wear resistance while maintaining fracture toughness, an understanding of the mechanisms linking the microstructure and the orientation-dependent fracture behaviour is required. (V,Al)N coatings were synthesised by direct current and high power pulsed magnetron sputtering. Uniaxial compression testing was performed using micropillars oriented between 0° and 90° with respect to the growth direction to assess the effect of microstructure on the fracture behaviour. We show here that different fracture mechanisms are active depending on the alignment of grains and loading direction. The fracture behaviour could be divided into three classes associated with column buckling, decohesion or shearing and no significant difference between the specimens induced by the deposition process could be observed. Graphical abstract

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Investigations on Mechanical and Tribological Behavior of dcMS/HPPMS CrN and (Cr,Al)N Hard Coatings Using Nanoscratch Technique

Cited by 24 publications

References 73 publications

Self‐Lubricating Physical Vapor Deposition Coatings for Dry Cold Massive Forming

Self‐Lubricating Physical Vapor Deposition Coatings for Dry Cold Massive Forming

Crack Resistance of Diamond‐Like Carbon Coatings

Orientation dependence of the fracture mechanisms in (V,Al)N coatings determined by micropillar compression

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