Effects of Al-Cr-Fe Quasicrystal Content on Tribological Properties of Cold-Sprayed Titanium Composite Coatings

Khun, Nay Win; Li, R. T.; Loke, K.; Khor, Khiam Aik

doi:10.1080/10402004.2014.991860

Cited by 35 publications

(28 citation statements)

References 35 publications

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“…In the case of the titanium cold spray coating, after 14 min, fluctuations were still noticeable due to the surface unevenness (a characteristic of the as-sprayed coating) and the friction coefficient, µ, varied in the range of 0.75-0.85, with an increasing trend. This trend is consistent with the results of Khun et al [25]. They observed a higher friction coefficient of Ti cold spray coating compared to the Ti bulk material, with a very irregular profile and large fluctuations.…”

Section: Resultssupporting

confidence: 82%

“…Titanium and its alloys are characterised by a high and unstable friction factor and strong adhesive wear degradation through an elevated propensity to seizure (localised damage due to the diffusion welding between sliding surfaces [22]) and scuffing (damage characterised by surface unevenness and asperities called hillocks [23]). A couple of papers dealing with the tribological properties of cold-sprayed titanium coatings [24,25] are also available in the literature, but, to date, the coupling between the cold-sprayed coating and laser treatment has not been studied and understood.…”

Section: Introductionmentioning

confidence: 99%

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On the Improvement of AA2024 Wear Properties through the Deposition of a Cold-Sprayed Titanium Coating

Astarita

Rubino

Carlone

et al. 2016

Metals

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This paper deals with the study of the enhancement of the tribological properties of AA2024 through the deposition of a titanium coating. In particular two different coatings were studied: (1) untreated titanium coating; and (2) post-deposition laser-treated titanium coating. Titanium grade 2 powders were deposited onto an aluminium alloy AA2024-T3 sheet through the cold gas dynamic spray process. The selective laser post treatment was carried out by using a 220 W diode laser to further enhance the wear properties of the coating. Tribo-tests were executed to analyse the tribological behaviour of materials in contact with an alternative moving counterpart under a controlled normal load. Four different samples were tested to assess the effectiveness of the treatments: untreated aluminium sheets, titanium grade 2 sheets, as-sprayed titanium powders and the laser-treated coating layer. The results obtained proved the effectiveness of the coating in improving the tribological behaviour of the AA2024. In particular the laser-treated coating showed the best results in terms of both the friction coefficient and mass lost. The laser treatment promotes a change of the wear mechanism, switching from a severe adhesive wear, resulting in galling, to an abrasive wear mechanism.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

On the Improvement of AA2024 Wear Properties through the Deposition of a Cold-Sprayed Titanium Coating

Astarita

Rubino

Carlone

et al. 2016

Metals

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“…Abrasive lines are apparently found on their wear tracks, which indicates that the wear of the AISI D3 samples is mainly attributed to the abrasive wear caused by the repeated sliding of the alumina ball [24,25]. However, the CHTWOT (Fig.…”

Section: Resultsmentioning

confidence: 92%

“…7(a) and 7(d) show the EDX spectra of the RAW slid against the alumina and steel balls, respectively, on which the C, O, Fe and Cr peaks are detected. The O peaks on the both wear tracks are indicative of the oxidiation process caused by high fricitonal heat generated during the sliding [24,25]. Figure 8(a) shows the friction coefficients of the AISI D3 samples with different treatments tested against the steel ball for about 25,000 laps under different normal loads.…”

Section: Resultsmentioning

confidence: 99%

Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

et al. 2015

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Abstract:In this study, the effects of deep cryogenic treatment (DCT) on the mechanical and tribological properties of AISI D3 tool steel were investigated together with a systematic correlation between their hardness and wear resistance. It was found that conventionally heat treated AISI D3 tool steel samples were significantly hardened via an additional DCT, which was attributed to the more retained austenite elimination, more homogenized carbide distribution and more reduction in carbide size in the samples. As a result, the hardened AISI D3 samples exhibited reductions in their friction and wear during rubbing against alumina and 100Cr6 steel balls under different normal loads due to the effectively hindered removal of surface materials. The results clearly showed that the DCT was an effective way to improve the mechanical and tribological properties of the AISI D3 tool steel samples as the tribological performance of the tool steel samples was significantly influenced by their hardness.

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“…The second phase is sometimes a temperature sensitive material such as CNT [223], nanodiamond [236,237], metallic glass [238], or quasicrystal [239,240], for which cold spray offers a unique merit of not inducing thermal degradation. In some cases a cold sprayed composite is produced as a precursor for subsequent reactive synthesis, e.g.…”

Section: Ceramics and Compositesmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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Cold spraying is a solid-state powder deposition process with several unique characteristics, allowing production of coatings or bulk components from a wide range of materials. The process has attracted much attention from academia and industry over the past two decades.The technical interest in cold spraying is twofold: first as a coating process for applications in surface technology, and second as a solid-state additive manufacturing process, offering an alternative to selective laser melting or electron beam melting methods. Moreover, cold spraying can be used to study materials behaviour under extremely high strain rates, high pressures and high cooling rates. The cold spraying process is thus considered to be relevant for various industrial applications, as well as for fundamental studies in materials science.This article aims to provide an overview of the cold spray process, the current understanding of the deposition mechanisms, and the related models and experiments, from a materials science perspective. IntroductionCold spraying (CS) is a solid-state material deposition technique, where micron-sized particles of a powder bond to a substrate as a result of high-velocity impact and the associated severe plastic deformation. Acceleration of particles to high velocities is obtained via expansion of a pressurised and (ironically) 'hot' gas through a diverging-converging nozzle.Despite heating the process gas -which is to provide higher acceleration of the gas and also to facilitate particle deformation through thermal softening -the feedstock remains in the solid state throughout the entire process; hence the name 'cold' spraying. This is to underline the contrast to conventional thermal spraying where particles are completely or partially molten upon impact onto the substrate. Alternative terminology includes cold gas spray, micro cold spray, cold gas dynamic spray, kinetic spray, supersonic particle deposition and metal powder application (MPA), all of which refer to the same principle of solid-state powder deposition as described above. CS is used for coating and repair. It is also used for additive manufacturing (AM) at relatively high deposition rates as compared to the methods based on selective laser or electron beam melting. The main advantage of CS is that it alleviates the problems associated with high temperature processing of materials, such as oxidation and unfavourable structural changes. It is possibly the only continuous method to produce bulk components of metastable materials that are available only in the powder form, e.g. as obtained from mechanical attrition or gas atomisation. The aim of the present paper is to provide an overview of CS from a materials perspective, particularly for a broader audience in materials research, e.g. with interest in dynamic phenomena, plasticity and phase transformations. In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is mos...

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Effects of Al-Cr-Fe Quasicrystal Content on Tribological Properties of Cold-Sprayed Titanium Composite Coatings

Cited by 35 publications

References 35 publications

On the Improvement of AA2024 Wear Properties through the Deposition of a Cold-Sprayed Titanium Coating

On the Improvement of AA2024 Wear Properties through the Deposition of a Cold-Sprayed Titanium Coating

Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

Cold spraying – A materials perspective

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