Fatigue behaviour in AZ80A magnesium alloy with DLC/thermally splayed WC-12Co hybrid coating

Okada, Hironari; Uematsu, Yoshihiko; Tokaji, Keiro

doi:10.1016/j.proeng.2010.03.031

Cited by 12 publications

(3 citation statements)

References 9 publications

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“…However, the large gap of elastic modulus between DLC film and Al substrate leads the easy delamination of DLC film when the coated material was subjected to the relatively high contact pressure. Therefore WC-12Co was thermally sprayed as an interlayer in order to improve the resistance against delamination under the contact pressure [3]. In this paper, the effect of DLC/thermally sprayed WC-12Co hybrid coating on the fatigue behavior in Al alloy was studied.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of A5052 Aluminum Alloy with DLC/Thermally Sprayed WC-12Co Hybrid Coatings

Uematsu

Kakiuchi

Kobayashi

et al. 2012

AMR

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Rotating bending fatigue tests had been performed using A5052 aluminum (Al) alloy with the hybrid coatings which consisted of tungsten carbide including 12% cobalt (WC-12Co) interlayer and diamond-like carbon (DLC) film, in order to investigate the effect of hybrid coating on the fatigue behavior. The WC-12Co layer was thermally sprayed by a high velocity oxygen fuel (HVOF) method on A5052 with the thickness of 70, 120 or 170μm. Subsequently, the DLC film was deposited with the thickness of 15μm. The fatigue strengths of the specimens with WC-12Co single layer were higher than those of the substrate and increased with increasing the thickness of WC-12Co layer. The fatigue strengths of the specimens with the hybrid coating of 70μm WC-12Co interlayer and 15μm DLC film were better than those of the specimen with 70μm WC-12Co single layer. Thus the hybrid coating structure was effective to improve fatigue strengths. However the beneficial effect of hybrid coating was not apparent in the specimens with thicker WC-12Co interlayer of 120 and 170μm.

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Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of A5052 Aluminum Alloy with DLC/Thermally Sprayed WC-12Co Hybrid Coatings

Uematsu

Kakiuchi

Kobayashi

et al. 2012

AMR

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“…DLC films can be deposited on a substrate by multiple methods such as physical vapor deposition (PVD) and ion beam assisted deposition (IBAD). The thickness of DLC films deposited by those conventional methods is generally less than a few micrometers, and it is difficult to deposit thicker films due to the high internal stresses [14]. Diamond-like carbon (DLC), with its selflubricating feature and high hardness value, is a good alternative candidate for tribological surfaces such as lead-containing brass and bronze.…”

Section: Achill Holzer Katharina Schmitzmentioning

confidence: 99%

Tribological Performances of Diamond‐Like Carbon Coatings for Hydraulic Applications

et al. 2022

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The tribological performance of contacts within hydraulic pumps over a wide range of conditions is essential for the sustainability of mobile hydraulic systems. To reduce the energy consumption of hydraulic systems, mechanical losses and wear rates need to be reduced. Additionally, materials containing lead must also be replaced due to their environmental impact. In this study, the performance of different lead-free combinations of hydrogenated diamond-like carbon (hydr. DLC) coatings were investigated. For this purpose, the tribological behavior of hydr. DLC (Balinit DLC), ceramic-doped hydr. DLC (Balinit C), and ceramic bond-coated hydr. DLC (Balinit DLC Star) coatings on a nitride steel substrate were compared in tribometer tests.

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“…When DLC is directly deposited on the Al substrate, the delamination of DLC film easily occurs under high contact pressure because the elastic modulus of Al substrate is much lower than that of DLC film so that hard DLC film could not follow larger deformation of Al substrate. Therefore WC12Co was thermally sprayed as an interlayer between substrate and DLC film in order to improve the resistance against delamination under the contact pressure [4]. In the present study, the thickness of WC-12Co interlayer was changed as 25, 70 and 120μm, keeping the thickness of DLC film constant as 15μm.…”

Section: Introductionmentioning

confidence: 98%

Effect of interlayer thickness on fatigue behavior in A5052 aluminum alloy with DLC/thermally sprayed WC-12Co hybrid coatings

Uematsu

Kakiuchi

Teratani

et al. 2013

Surface Effects and Contact Mechanics XI

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Tungsten carbide with 12% cobalt (WC-12Co) was thermally sprayed by a high velocity oxygen fuel (HVOF) method on A5052 aluminum alloy as an interlayer with the thicknesses of 25, 70 and 120 m and subsequently diamond-like carbon (DLC) was deposited with the thickness of 15 m to fabricate DLC/WC12Co hybrid coating. Rotary bending fatigue tests were conducted using the specimens with DLC/WC-12Co hybrid coating and the thickness effect of interlayer on fatigue behavior was investigated. The fatigue strengths of the specimens with WC-12Co single layer were higher than those of the substrate. The fatigue strengths increased with increasing the thickness of WC-12Co layer. The specimens with hybrid coating exhibited higher fatigue strengths than the specimens with WC-12Co single layer when the thickness of WC-12Co layer was the same. The thinnest WC-12Co interlayer led to the mostly improved fatigue strengths by hybrid coating system. In the specimens with hybrid coating, DLC film could suppress the micro-cracking of WC-12Co interlayer, and thus the fatigue strengths were improved. When the interlayer became thicker, the effect of thin DLC film became weaker and resulted in the lower improvement of fatigue strengths.

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Fatigue behaviour in AZ80A magnesium alloy with DLC/thermally splayed WC-12Co hybrid coating

Cited by 12 publications

References 9 publications

Fatigue Behavior of A5052 Aluminum Alloy with DLC/Thermally Sprayed WC-12Co Hybrid Coatings

Fatigue Behavior of A5052 Aluminum Alloy with DLC/Thermally Sprayed WC-12Co Hybrid Coatings

Tribological Performances of Diamond‐Like Carbon Coatings for Hydraulic Applications

Effect of interlayer thickness on fatigue behavior in A5052 aluminum alloy with DLC/thermally sprayed WC-12Co hybrid coatings

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