Nano-scratch testing of (Ti,Fe)N x thin films on silicon

Beake, Ben D.; Vishnyakov, Vladimir; Harris, Adrian L.

doi:10.1016/j.surfcoat.2016.11.024

Cited by 40 publications

(10 citation statements)

References 68 publications

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“…Coatings with very high H/E can behave poorly due to their limited ductility, with reduced critical load. For hard coatings deposited on silicon there is more extensive delamination at failure [16,17,20,29], or chipping for harder DLC coatings on hardened steel [35]. Consistent with this general trend the smallest critical load was found for the hardest coating, TiAlN.…”

Section: Ramped Load Scratch Testing At 25 ºCsupporting

confidence: 65%

“…It has been shown previously that a strong correlation exists between the mechanical properties of coatings (primarily hardness and H/E) and the scratch test critical load (L c2 ) [16,17,20,34]. The nanoindentation data in Table 1 shows that at room temperature TiAlN was hardest at around 30 GPa, and AlTiN softest (20 GPa), with a significantly lower elastic modulus than the other two coatings [24,25].…”

Section: Ramped Load Scratch Testing At 25 ºCmentioning

confidence: 83%

“…The scratch test is a convenient method for producing damage to simulate abrasive wear [13][14] and a popular choice for coating adhesion assessment [15]. However, it is well known that critical loads in the scratch test do not directly correspond to more adherent films since the critical load is dependent on many factors in addition to the interfacial strength [16][17].…”

Section: Introductionmentioning

confidence: 99%

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Elevated temperature repetitive micro-scratch testing of AlCrN, TiAlN and AlTiN PVD coatings

Beake

Endrino

Kimpton

et al. 2017

International Journal of Refractory Metals and Hard Materials

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In developing advanced wear-resistant coatings for tribologically extreme highly loaded applications such as high speed metal cutting a critical requirement is to investigate their behaviour at elevated temperature since the cutting process generates frictional heat which can raise the temperature in the cutting zone to 700-900°C or more. High temperature micro-tribological tests provide severe tests for coatings that can simulate high contact pressure sliding/abrasive contacts at elevated temperature. In this study ramped load micro-scratch tests and repetitive microscratch tests were performed at 25 and 500°C on commercial monolayer coatings (AlCrN, TiAlN and AlTiN) deposited on cemented carbide cutting tool inserts. AlCrN exhibited the highest critical load for film failure in front of the moving scratch probe at both temperatures but it was prone to an unloading failure behind the moving probe. Scanning electron microscopy showed significant chipping outside the scratch track which was more extensive for AlCrN at both room and elevated temperature. Chipping was more localised on TiAlN although this coating showed the lowest critical loads at both test temperatures. EDX analysis of scratch tracks after coating failure showed tribo-oxidation of the cemented carbide substrate. AlTiN showed improved scratch resistance at higher temperature. The von Mises, tensile and shear stresses acting on the coating and substrate sides of the interface were evaluated analytically to determine the main stresses acting on the interface. At 1 N there are high stresses near the coating-substrate interface. Repetitive scratch tests at this load can be considered as a sub-critical load micro-scale wear test which is more sensitive to adhesion differences than the ramped load scratch test. The analytical modelling showed that a dramatic improvement in the performance of AlTiN in the 1 N test at 500°C could be explained by the stress distribution in contact resulting in a change in yield location due to the high temperature mechanical properties. The increase in critical load with temperature on AlTiN and AlCrN is primarily a result of the changing stress distribution in the highly loaded sliding contact rather than an improvement in adhesion strength.

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Section: Ramped Load Scratch Testing At 25 ºCsupporting

confidence: 65%

Section: Ramped Load Scratch Testing At 25 ºCmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Elevated temperature repetitive micro-scratch testing of AlCrN, TiAlN and AlTiN PVD coatings

Beake

Endrino

Kimpton

et al. 2017

International Journal of Refractory Metals and Hard Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous works have shown that there is a correlation between the scratch test critical load Lc2 and the mechanical properties of the coatings, essentially hardness and the ratio of hardness to elasticity (H/E) [39,40]. The nano-indentation data in Figure 6b, shows that at room temperature, the multilayer coating with a 500 nm interlayer has the lowest hardness with elastic modulus of (502.35 ± 11.42092) GPa, which results in the lowest H/E ratio for this coating.…”

Section: Micro-mechanical Property Analysismentioning

confidence: 99%

Effect of Interlayer Thickness on Nano-Multilayer Coating Performance during High Speed Dry Milling of H13 Tool Steel

et al. 2019

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The TiAlCrSiYN-based family of physical vapor deposition (PVD) coatings were systematically designed through the incorporation of TiAlCrN interlayer to increase coating adhesion and consequently the tool life for extreme conditions that arise during dry high-speed milling of hardened tool steels. The investigation in the present paper intends to explain the effect of TiAlCrN interlayer thickness on the overall coating properties and cutting performance. A comprehensive characterization of the structure and properties of the coatings has been performed using focused ion beam (FIB), scanning electron microscope (SEM), X-ray powder diffraction (XRD), nanoindentation, ramped load scratch test, repetitive load wear test, and nano-impact test. The wear test at a subcritical load of 1.5 N showed that there was a gradual improvement in coating adhesion to the substrate as the interlayer thickness increased from 100 to 500 nm. However, the wear performance, being related to the ability of the coating layer to exhibit minimal surface damage under operation, was found to be associated with micro-mechanical characteristics (such as hardness, elastic modulus). Around a 40% increase in the cutting performance with 300 nm interlayer exhibited that a substantial increase in tool life can be achieved through interlayer thickness variation, by obtaining a balance between mechanical and tribological properties of the studied coatings.

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“…It is mainly used to determine the adhesion strength and evaluate the failure modes of coatings. The majority of published work in nanoscratch testing area relates to establishing mechanical parameters of various coating/substrate systems [22][23][24][25]. However not a much has been done to characterize the mechanical and tribological properties of reinforced barrier coatings.…”

Section: Sample Preparationmentioning

confidence: 99%

Nanoscale Characterization of Glass Flake Filled Vinyl Ester Anti-Corrosion Coatings

Barbhuiya

Choudhury

2017

Coatings

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Vinyl ester is a thermoset matrix resin that is widely used in the coating industry. The presence of glass flakes further enhances the anti-corrosion performance of this coating. This paper reports the nanoscaled characterization of glass flake filled vinyl ester anti-corrosion coatings on mild steel. Bond strength properties of one uncoated and four coated samples with different thicknesses (300, 600, 900 and 1200 µm) were studied using nanoscratch technique and ASTM Standard Test. It was found that the bond strength of coating with thickness 900 µm was the highest. The frequency distributions of elastic modulus on coating with 900 µm thickness determined using nanoindentation indicated that only 20-25% of the coating is composed of glass flakes and the balance is vinyl ester matrix. The critical depth at which the material is subject to failure due to external load and abrasion, was found to be around 100 nm.

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Nano-scratch testing of (Ti,Fe)N x thin films on silicon

Cited by 40 publications

References 68 publications

Elevated temperature repetitive micro-scratch testing of AlCrN, TiAlN and AlTiN PVD coatings

Elevated temperature repetitive micro-scratch testing of AlCrN, TiAlN and AlTiN PVD coatings

Effect of Interlayer Thickness on Nano-Multilayer Coating Performance during High Speed Dry Milling of H13 Tool Steel

Nanoscale Characterization of Glass Flake Filled Vinyl Ester Anti-Corrosion Coatings

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