Regulating the uniformity of DLC films in ECR plasma with negative substrate biasing

Deng, Qiuju; Wang, C.M.; Zhang, T.F.; Yang, Wenmao; Li, Xueyuan; Huang, Nan; Leng, Y.X.

doi:10.1016/j.surfcoat.2018.06.042

Cited by 9 publications

(2 citation statements)

References 35 publications

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“…Raman spectroscopy, as a widespread and nondestructive method, was applied to analyze the intricate carbon structure of the DLC films. There is a broad peak around 1500 cm −1 for amorphous carbon films in Raman spectrum, and two Gaussian peaks corresponding to 1550 (G peak) and 1350 cm −1 (D peak) can be obtained by calculating and fitting 22 . The integral ratio of D peak to G peak ( I D / I G ) is closely related to the relative content of sp 2 ‐C and sp 3 ‐C in amorphous carbon films 11,23 .…”

Section: Resultsmentioning

confidence: 99%

Diamond‐like carbon films prepared by a low temperature periodic process for application in ventricular assist devices

et al. 2022

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Due to the poor tribological properties of titanium (Ti) and its alloy Ti6Al4V (commonly used for ventricular assist devices manufacturing), diamond‐like carbon (DLC) films with excellent anti‐wear properties are pursued to improve the wear resistance of Ti and its alloys. Considering the effect of temperature on magnets inside pump impellers and workpiece deformation, DLC films are preferred to be prepared under low temperature. In this study, DLC films were prepared on Ti6Al4V alloys by periodic and continuous processes, and the corresponding maximum deposition temperature was 85 and 154°C, respectively. The periodic DLC films exhibited the feature of columnar structure, and the surface hillocks were less uniform than that of continuous DLC films. The periodic DLC films possessed more sp3‐bonded structures, and the accessorial sp3‐bonding mainly existed in the form of CH. Compared to continuous DLC films, the periodic DLC films had lower residual stress and better adhesion with Ti6Al4V substrates. Both DLC films could effectively reduce the friction coefficient and wear rate of Ti6Al4V alloys both in air and fetal bovine serum (FBS), and the periodic DLC films exhibited superior anti‐wear properties to that of continuous DLC films in FBS. Haemocompatibility evaluation revealed that both DLC films presented similar levels of more human platelet adhesion and activation as compared with that of bare Ti6Al4V. However, both DLC films significantly prolonged plasma clotting time in comparison to bare Ti6Al4V. This study demonstrates the potential of low‐temperature DLC films as wear‐resistant surface modification for VADs.

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Section: Resultsmentioning

confidence: 99%

Diamond‐like carbon films prepared by a low temperature periodic process for application in ventricular assist devices

et al. 2022

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“…Diamond-like carbon (DLC) coating represents an amorphous structure combined with sp 2 and sp 3 carbon bonds with a minimal presence of sp 1 bonds [5]. Consequently, these coatings exhibit properties of graphite and diamond.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bias Voltages on the Tribological Behaviors of DLC Coatings

Zhang,

Huang,

Sun

et al. 2024

Coatings

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Ti/TiN/(Ti,N)-DLC/Ti-DLC/DLC coatings were deposited on 431 stainless steel using direct current magnetron sputtering technology under different bias voltages(0 V, −100 V, −200 V and −300 V). The microstructure and tribocorrosion performance of these DLC coatings in seawater was investigated. The results indicated that under the bias voltages, a denser and smoother surface of DLC coatings with a higher bonding strength between coatings and substrates was observed related to the increased incident kinetic energy of deposited ionized atoms. When the bias voltage was −200 V, the surface roughness reduced from 9.81 nm to 7.03 nm, and the bonding strength enhanced from 8.23 N to 8.86 N. What is more, the sp3 bond proportion and the disorder degree in DLC coatings both increased, which resulted in improved hardness and deformation resistance. However, when the bias voltage was −300 V, the increase of the amorphization was associated with a simultaneous rise in internal stress, which reduced the hardness and bond strength a little (8.72 N). DLC coatings can effectively improve the tribocorrosion properties of 431 stainless steel in seawater. When the voltage was −200 V, the average friction coefficient decreased from 0.35 to 0.07, with shallower wear traces and the wear loss of the DLC coating also being the smallest. The abrasive wear caused by metal oxides falling off the grinding ball, and the plastic deformation of the DLC coatings are the main wear forms. The high-density structure of DLC coatings under bias voltages can not only prevent the rapid expansion of cracks during deformation, but also provides a physical barrier to the erosion, which improves the corrosion and friction resistance in seawater. The optimization of bias voltage can improve the tribological performance of DLC coatings by regulating the carbon chain bond and microstructure. These results provide reference for DLC preparation and their potential engineering applications in stainless steel.

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Metal‐Driven Autoantifriction Function of Artificial Hip Joint

et al. 2023

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The service life of an artificial hip joint is limited to 10–15 years, which is not ideal for young patients. To extend the lifespan of these prostheses, the coefficient of friction and wear resistance of metallic femoral heads must be improved. In this study, a Cu‐doped titanium nitride (TiNX–Cu) film with “autoantifriction” properties is deposited on a CoCrMo alloy via magnetron sputtering. When delivered in a protein‐containing lubricating medium, the Cu in TiNX–Cu quickly and consistently binds to the protein molecules in the microenvironment, resulting in the formation of a stable protein layer. The proteins adsorbed on the TiNX–Cu surface decompose into hydrocarbon fragments owing to the shear stress between the Al2O3/TiNX–Cu tribopair. The synergistic effect of the catalysis of Cu and shear stress between the Al2O3/TiNX–Cu tribopair transforms these fragments into graphite‐like carbon tribofilms with an antifriction property. These tribofilms can simultaneously reduce the friction coefficient of the Al2O3/TiNX–Cu tribopair and enhance the wear resistance of the TiNX–Cu film. Based on these findings, it is believed that the autoantifriction film can drive the generation of antifriction tribofilms for lubricating and increasing the wear resistance of prosthetic devices, thereby prolonging their lifespan.

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Regulating the uniformity of DLC films in ECR plasma with negative substrate biasing

Cited by 9 publications

References 35 publications

Diamond‐like carbon films prepared by a low temperature periodic process for application in ventricular assist devices

Diamond‐like carbon films prepared by a low temperature periodic process for application in ventricular assist devices

Effects of Bias Voltages on the Tribological Behaviors of DLC Coatings

Metal‐Driven Autoantifriction Function of Artificial Hip Joint

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