Mechanical and biomedical properties of copper-containing diamond-like carbon films on magnesium alloys

Yu, Xingwen; Ning, Zhenwu; Hua, Meng; Wang, Chengbiao; Cui, Fuzhai

doi:10.1039/c3tb20570c

Cited by 14 publications

(4 citation statements)

References 24 publications

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“…Hardness of Cu-DLC film continues to drop to its minimum of 14. 8 GPa when doped Cu [15] content reaches its maximum content of 32. 6%.…”

Section: Hardness Of Cu-dlc Filmmentioning

confidence: 99%

Fabrication of Cu-doped Diamond-like Carbon Film for Improving Sealing Performance of Hydraulic Cylinder of Shearer

Shi,

Ye,

et al. 2023

Preprint

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During shearer operation, piston rod is susceptible to wear from invasion of pollutants, and then ruins sealing ring in hydraulic cylinder. This work attempts to conduct a systematical investigation of Cu-DLC (Cu-doped Diamond-like Carbon) film to improve the seal performance. Failure process of hydraulic cylinder was analyzed, and relevant parameters were determined. Several Cu-DLC films were deposited on the substrate of piston rod in a multi-ion beam assisted system, and their structures and combined tribological performances were investigated. As a result, dust particles attached to the piston rod may enter the cylinder, and damage the sealing ring under the radial force. Cu grains prefer to orientate (111) crystal plane with increase of Cu content, and may induce drop of hardness and internal stress for the film. Friction coefficient of the film ranges from 0.04 to 0.15, and rise of IG/ID ratio from 1.4 to 2.3 in Raman data indicates that bond transition from sp3-C to sp2-C may lower the friction coefficient. Modification mechanism of Cu-DLC film for the seal performance may come from synergistic effects of (i) contact force and friction heat induce the film graphitization, (ii) Cu doping improves toughness of the film and acts as a solid lubricant, and (iii) transfer layer plays a role of self-lubrication.

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“…Hardness of Cu-DLC film continues to drop to its minimum of 14. 8 GPa when doped Cu [15] content reaches its maximum content of 32. 6%.…”

Section: Hardness Of Cu-dlc Filmmentioning

confidence: 99%

Fabrication of Cu-doped Diamond-like Carbon Film for Improving Sealing Performance of Hydraulic Cylinder of Shearer

Shi,

Ye,

et al. 2023

Preprint

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“…[60] A diamondlike carbon/Cu composite nanocoating on an AZ31 Mg al-loy surface served as a compact and uniform superhydrophobic film, which reduced platelet adhesion and maintained a low friction coefficient to prevent thrombosis, thus improving hemocompatibility. [59,61] Large surface areas of nanomaterials [e.g., graphene oxide (GO), multiwalled carbon nanotubes] [30,62] with abundant -COOH groups may enhance the anticoagulant activity of composite nanocoatings. [63] A 16-phosphonylhexadecanoic acid/chitosan-functionalized GO (GOCS) composite coating prepared on AZ31B Mg alloy decreased platelet adhesion (to ≈59% of that of bare metal) and activation, as evidenced by a 48% increased expression of cyclic guanosine monophosphate (cGMP), which reflects platelet inhibition.…”

Section: Preventing Vascular Stent Thrombosis and Restenosismentioning

confidence: 99%

Composite Nanocoatings of Biomedical Magnesium Alloy Implants: Advantages, Mechanisms, and Design Strategies

Dai

Xiong

et al. 2023

Advanced Science

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The rapid degradation of magnesium (Mg) alloy implants erodes mechanical performance and interfacial bioactivity, thereby limiting their clinical utility. Surface modification is among the solutions to improve corrosion resistance and bioefficacy of Mg alloys. Novel composite coatings that incorporate nanostructures create new opportunities for their expanded use. Particle size dominance and impermeability may increase corrosion resistance and thereby prolong implant service time. Nanoparticles with specific biological effects may be released into the peri‐implant microenvironment during the degradation of coatings to promote healing. Composite nanocoatings provide nanoscale surfaces to promote cell adhesion and proliferation. Nanoparticles may activate cellular signaling pathways, while those with porous or core–shell structures may carry antibacterial or immunomodulatory drugs. Composite nanocoatings may promote vascular reendothelialization and osteogenesis, attenuate inflammation, and inhibit bacterial growth, thus increasing their applicability in complex clinical microenvironments such as those of atherosclerosis and open fractures. This review combines the physicochemical properties and biological efficiency of Mg‐based alloy biomedical implants to summarize the advantages of composite nanocoatings, analyzes their mechanisms of action, and proposes design and construction strategies, with the purpose of providing a reference for promoting the clinical application of Mg alloy implants and to further the design of nanocoatings.

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“…Since magnesium substrates are highly susceptible to electrochemical dissolution in physiological environments, the degradation property of each sample was estimated. 32 The changes in Mg 2+ ion concentration in the immersion medium over time during the degradation process of different samples are presented in Fig. 6B.…”

Section: In Vitro Degradation and Corrosionmentioning

confidence: 99%

Controlled release and corrosion protection by self-assembled colloidal particles electrodeposited onto magnesium alloys

et al. 2015

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Mechanical and biomedical properties of copper-containing diamond-like carbon films on magnesium alloys

Cited by 14 publications

References 24 publications

Fabrication of Cu-doped Diamond-like Carbon Film for Improving Sealing Performance of Hydraulic Cylinder of Shearer

Fabrication of Cu-doped Diamond-like Carbon Film for Improving Sealing Performance of Hydraulic Cylinder of Shearer

Composite Nanocoatings of Biomedical Magnesium Alloy Implants: Advantages, Mechanisms, and Design Strategies

Controlled release and corrosion protection by self-assembled colloidal particles electrodeposited onto magnesium alloys

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