Effects of laser power on microstructure and friction–wear performances of direct energy deposited ZrO2–8%Y2O3–NiCoCrAl coatings on Ti6Al4V alloy

Weicheng, Kong; Li, Kangmei; Hu, Jun

doi:10.1016/j.optlastec.2021.107214

Cited by 16 publications

(8 citation statements)

References 41 publications

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“…In this situation, the COF appears to be independent of the applied remelting technology. The present values of the COF are in good agreement with the ones of Weicheng et al [ 51 ] and Gahr et al [ 52 ], both studies testing sliding wear in unlubricated conditions for ZrO 2 -reinforced materials.…”

Section: Resultssupporting

confidence: 92%

“…This might be attributed to the strong densification during the controlled atmosphere post-treatment, where trapped gases inside the coating were heavily eliminated, and moreover, due to the presence of ZrO 2 , which might generate an auto-lubricating film, as already observed by other researchers [ 53 , 54 ]. The presence of transferred layers, as reported in previous studies, favored the achievement of a steady state on the COF evolution, and a similar trend is observed here as well [ 51 , 55 ]. Furthermore, the as-sprayed sample showed large regions of spalling where supposedly even the matrix was removed, the occurrence of such phenomena emphasizing the importance of the post-treatment.…”

Section: Resultssupporting

confidence: 90%

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Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Kazamer¹,

Muntean

Uţu

et al. 2023

Materials

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Without proper post-processing (often using flame, furnace, laser remelting, and induction) or reinforcements’ addition, Ni-based flame-sprayed coatings generally manifest moderate adhesion to the substrate, high porosity, unmelted particles, undesirable oxides, or weak wear resistance and mechanical properties. The current research aimed to investigate the addition of ZrO2 as reinforcement to the self-fluxing alloy coatings. Mechanically mixed NiCrBSi-ZrO2 powders were thermally sprayed onto an industrially relevant high-grade steel. After thermal spraying, the samples were differently post-processed with a flame gun and with a vacuum furnace, respectively. Scanning electron microscopy showed a porosity reduction for the vacuum-heat-treated samples compared to that of the flame-post-processed ones. X-ray diffraction measurements showed differences in the main peaks of the patterns for the thermal processed samples compared to the as-sprayed ones, these having a direct influence on the mechanical behavior of the coatings. Although a slight microhardness decrease was observed in the case of vacuum-remelted samples, the overall low porosity and the phase differences helped the coating to perform better during wear-resistance testing, realized using a ball-on-disk arrangement, compared to the as-sprayed reference samples.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 90%

Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Kazamer¹,

Muntean

Uţu

et al. 2023

Materials

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“…This was because the energy density of laser beam led to the irregular shape, which prevented the fusion line from sliding relatively 17 and enhanced the adhesion force of coating–substrate. 18 Figure 4(b) shows the OM image of Ni–WC–4%Ti 2 SnC coating cross-section. Some bubbles and pores were found on the coating cross-section, and no other defects were found.…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

Effect of Ti₂SnC mass fraction on microstructure and friction–wear performance of laser cladded Ni–WC coatings under WS₂ lubrication condition

Yongfu

Dejun

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Ni–WC coatings with the different Ti2SnC mass fractions were prepared on the substrate of S136 steel by laser cladding (LC), in which the metallurgical bonding was formed at the coating interfaces. The microstructure and phases of obtained coatings were analyzed using a super depth of field microscope (SDFM) and X-ray diffraction (XRD), respectively. The effect of Ti2SnC mass fraction on the microstructure and tribological properties of Ni–WC coating were investigated using a ball-on-disc wear tester, and the wear model was also established to analyze the role of Ti2SnC phase in the friction process. The results show that the Ni–WC–8%Ti2SnC coating has the lowest coefficient of friction (COF) and wear rate among the three kinds of coating, and the wear mechanism is abrasive wear, which is contributed to the friction reduction and wear resistance roles of Ti2SnC phase. Furthermore, the COF and wear rate of Ni–WC coating can be reduced by the addition of appropriate Ti2SnC mass fraction, which may provide the reference for the friction and wear of Ti2SnC MAX phase in the coating field.

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“…Various surface modifications have been worked out to improve the surface properties of titanium alloys. For example, plasma nitriding gives titanium surfaces a low friction coefficient; nevertheless, it has demerits including high treatment temperature, long treatment time, large distortion, and thin treated layers. − Thermal spraying is another technique to coat titanium alloys, but the coating density is a problem and the bond strength is low . Other surface treatment methods such as shot peening, electroplating, ion implantation, PVD, and laser surface alloying are also applied. − A common problem for the above-mentioned methods is that the load-bearing capacity (LBC) of these thin modified layers is not high enough due to the soft substrate, which limits their applications. , …”

Section: Introductionmentioning

confidence: 99%

A Novel Treatment to Selectively Harden Ti6Al4V Surfaces

Wei

Zhang

2023

ACS Omega

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Various surface treatments have been developed on titanium and its alloy to improve their tribological properties. However, for some components, only specific surfaces need to be hardened rather than the whole surfaces. This study develops a duplex heat treatment including selective surface hardening by prepainting TiO2 powders and thermal oxidation. It is found that the TiO2 powder layer can be used as an oxygen reservoir for boosting diffusion treatment at temperatures of 800–900 °C. The abundance of oxygen provides high potential and accelerates the diffusion process, deeply hardening the surface case. Moreover, the duplex treatment is optimal for selectively hardened surfaces with high load-bearing capacity and much improved tribological properties. Prepainting the surfaces that need to be hardened is easy to operate and has good potential to be applied in industry.

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Effects of laser power on microstructure and friction–wear performances of direct energy deposited ZrO2–8%Y2O3–NiCoCrAl coatings on Ti6Al4V alloy

Cited by 16 publications

References 41 publications

Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Effect of Ti₂SnC mass fraction on microstructure and friction–wear performance of laser cladded Ni–WC coatings under WS₂ lubrication condition

A Novel Treatment to Selectively Harden Ti6Al4V Surfaces

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Effects of laser power on microstructure and friction–wear performances of direct energy deposited ZrO2–8%Y2O3–NiCoCrAl coatings on Ti6Al4V alloy

Cited by 16 publications

References 41 publications

Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Effect of Ti2SnC mass fraction on microstructure and friction–wear performance of laser cladded Ni–WC coatings under WS2 lubrication condition

A Novel Treatment to Selectively Harden Ti6Al4V Surfaces

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Effect of Ti₂SnC mass fraction on microstructure and friction–wear performance of laser cladded Ni–WC coatings under WS₂ lubrication condition