Microstructure, electrochemical and tribocorrosion behaviors of CrCN nanocomposite coating with various carbon content

Xu, Xing; Sun, Jining; Xu, Zhibiao; Li, Zhujun; Su, Fenghua

doi:10.1016/j.surfcoat.2021.126997

Cited by 36 publications

(15 citation statements)

References 38 publications

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“…According to Musil et al, the hard coatings with H/E >1 showed better resistance to cracking and thus better wear resistance [37]. In this study, these H/E values were comparable to those of other bearing coatings for joint replacement such as CrN coatings (with H/E of 0.07-0.08, H 3 /E 2 of 0.05-0.08) [38] and TaC coatings (with H/E of 0.085-0.113) [39]. The coatings deposited at a flow ratio of 5 showed the highest values of H/E and H 3 /E 2 , at 0.11 and 0.28, respectively.…”

Section: Mechanical Properties Of the Coatingssupporting

confidence: 78%

Effects of N/Si ratio on mechanical properties of amorphous silicon nitride coating

Zhou,

Persson,

Xia

et al. 2023

Mater. Res. Express

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The utilization of silicon nitride coatings has been proposed as an effective method to enhance wear resistance and mitigate the release of metallic ions from biomedical implants. However, the relatively high dissolution rate of low-density coatings remains an obstacle to their implementation. Here, chemical vapour deposition techniques may have advantages over the typically used physical vapour deposition (PVD) methods. Therefore, in this study, silicon nitride coatings were obtained by low-pressure chemical vapor deposition (LPCVD). Since the nitrogen-to-silicon (N/Si) ratio and deposition temperature have been reported as major factors affecting the performance of the coatings, the effects of ammonia (NH3) to dichlorosilane (SiH2Cl2) flow ratio and deposition temperature were systemically investigated in the form of microstructure, mechanical and tribological properties of the coatings. The results revealed that the coatings exhibited a dense structure. As the ammonia flow ratio increased, the surface became smoother, and the hardness and elastic modulus increased and reached the maximum at a flow ratio of 4, giving a hardness of around 27 GPa and an elastic modulus of 290 GPa, respectively. The higher mechanical properties of the coatings deposited at a flow ratio of 4 are attributed to the stronger covalent Si-N bonding, as confirmed by XPS results. However, the coatings deposited at a flow ratio of 2 exhibited the lowest wear rate, at 9.5 × 10−7 mm3 Nm−1, around one-third of the value of the coatings deposited at a flow ratio of 6, likely due to the high silicon content of these coatings. Increasing the temperature resulted in an increased deposition rate, higher hardness and elastic modulus as well as a lower wear rate, likely due to incomplete reactions at lower temperatures. The generally high hardness and low wear rate indicate that the coatings deposited by LPCVD are promising for application in spinal implants.

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Section: Mechanical Properties Of the Coatingssupporting

confidence: 78%

Effects of N/Si ratio on mechanical properties of amorphous silicon nitride coating

Zhou,

Persson,

Xia

et al. 2023

Mater. Res. Express

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“…The unsatisfactory corrosion behavior of PVD coatings is to a large extend caused by process-related growth defects such as pinholes or macroparticles ("droplets") [2]. Typical PVD hard coatings based on TiN or CrN typically exhibit a nobler behavior compared to unalloyed and low-alloyed steels and therefore accelerate galvanic corrosion due to the high anodic current density present at defects [3]. The driving force for galvanic corrosion is determined by the difference in corrosion potentials between the coating and the substrate (Fig.…”

Section: Introductionmentioning

confidence: 99%

Empowering PVD for corrosion protection

Hoche,

Ulrich,

Kaestner

et al. 2024

Vak Forsch Prax

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SummaryA novel, monolithic DC‐magnetron sputtered TiN+MgGd coating, only 3to5 μm thick, effectively protects steel substrates from corrosion. This achievement is due to alloying of TiN with MgGd, which not only maintains the renowned wear resistance of TiN coatings, but potentially improves it through optimized deposition parameters.The key to the enhanced corrosion resistance lies in the addition of magnesium (Mg) and gadolinium (Gd). It reduces the coating's free corrosion potential, thereby mitigating the driving force for galvanic corrosion between coating and substrate. Moreover, at specific Mg to Gd ratios, a cathodic protection effect can be observed. Crucially, the presence of Gd is essential for this performance. It imparts hydrophobicity to the coating surface, reinforces a passivating layer and significantly enhances defect tolerance.This discovery paves the way for a sustainable alternative to electroplated chromium or combined electroplating and PVD, offering superior corrosion protection with minimal coating thickness.

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“…CrCN coatings are used for protective coatings in marine environments [15,16], anti-wear coatings in joints [17], and anti-friction coatings in mechanical devices [18], due largely to their excellent properties at high temperatures [19]. The nanocrystalline/amorphous structure and hard Cr 7 C 3 phase that forms when CrN coatings are doped with carbon can significantly improve the mechanical properties [20].…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbon Doping and DC Bias Voltage on Microstructure and Mechanical Properties of AlCrCN Films Synthesized via HiPIMS

et al. 2022

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This work compares the hardness and adhesion properties of AlCrN and AlCrCN hard coatings synthesized via HiPIMS using Al70Cr30 and Cr targets. The hardness and adhesion properties of AlCrCN films were optimized by performing deposition under various C2H2 flow rates (5, 8, 10, 13, 15, or 20 sccm) and DC bias voltages (−40, −60, −80, −100, or −120 V). EPMA results clearly indicated that the carbon content was increased from 1.9 to 12.2 at.% with increasing C2H2 flow rate from 5 to 20 sccm. XPS results confirmed a various content of chemical bonds (Cr-N, C-N, sp2, and sp3) with various C2H2 flow rate. Grain and columnar refinement in AlCrCN were derived from XRD, TEM, and SAED results. The higher hardness (28.6 GPa) and Young’s modulus (358 GPa) were obtained using an C2H2 flow rate of 5 sccm and a bias voltage of −60 V. Both of which subsequently decreased to 13.5 GPa and 212 GPa, respectively. This can be attributed to the C-N bond inhibiting the development of metal-N bonds. Increasing the bias voltage to −120 V increased the hardness to 32.9 GPa and the Young’s modulus to 372 GPa. Note that the application of bias voltage to enhance hardness should also be applicable to carbon-doped AlCrN films as well. All samples presented good adhesion characteristics (class 1; ISO26443:2008-06).

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Microstructure, electrochemical and tribocorrosion behaviors of CrCN nanocomposite coating with various carbon content

Cited by 36 publications

References 38 publications

Effects of N/Si ratio on mechanical properties of amorphous silicon nitride coating

Effects of N/Si ratio on mechanical properties of amorphous silicon nitride coating

Empowering PVD for corrosion protection

Effects of Carbon Doping and DC Bias Voltage on Microstructure and Mechanical Properties of AlCrCN Films Synthesized via HiPIMS

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