Phase morphology and tribological properties of PI/UHMWPE blend composites

Cheng, Bingxue; Duan, Haitao; Chen, Song; Shang, Hongfei; Li, Jian

doi:10.1016/j.polymer.2020.122658

Cited by 21 publications

(16 citation statements)

References 33 publications

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“…Corresponding LM images of the wear track on UHMWPE reference disks after 2 × 10 5 cycles with measurement positions of Raman spectroscopy (a) as well as averaged spectra (b) at locations outside (pristine, green color) and inside the wear track (degraded, orange) as well as in between (partially degraded, blue) are displayed in Figure 9 (versus CoCr) and Figure 10 (versus Ti64), respectively. With small peaks at 1065, 1293, 1305, 1435 and 2724 cm −1 as well as pronounced peaks at 2848 and 2880 cm −1 , this showed typical characteristics of UHMWPE [ 73 , 95 , 96 ] and no changes due to tribological testing and wear. The CoCr and Ti64 counter-bodies are not Raman active [ 73 ], and therefore, no results could be shown here.…”

Section: Resultsmentioning

confidence: 82%

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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Diamond-like carbon coatings may decrease implant wear, therefore, they are helping to reduce aseptic loosening and increase service life of total knee arthroplasties (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt-chromium-molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While the deposition of a pure (a-C:H) and tungsten-doped hydrogen-containing amorphous carbon coating (a-C:H:W) as well as the detailed characterization of mechanical and adhesion properties were the subject of Part I, the tribological behavior is studied in Part II. Pin-on-disk tests are performed under artificial synovial fluid lubrication. Numerical elastohydrodynamic lubrication modeling is used to show the representability of contact conditions for TKAs and to assess the influence of coatings on lubrication conditions. The wear behavior is characterized by means of light and laser scanning microscopy, Raman spectroscopy, scanning electron microscopy and particle analyses. Although the coating leads to an increase in friction due to the considerably higher roughness, especially the UHMWPE wear is significantly reduced up to a factor of 49% (CoCr) and 77% (Ti64). Thereby, the coating shows continuous wear and no sudden failure or spallation of larger wear particles. This demonstrated the great potential of amorphous carbon coatings for knee replacements.

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Section: Resultsmentioning

confidence: 82%

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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“…The averaged Raman spectra of the coated metallic Ti64:W and CoCr:W specimens (pins and disks) as well as the uncoated and coated UHMWPE disks are depicted in Figure 6. While the uncoated metallic specimens were not Raman active, the uncoated UHMWPE disks (Figure 6b, blue) featured characteristic intense peaks at 2848 and 2880 cm −1 as well as weaker peaks at 1065, 1293, 1305, 1435, and 2724 cm −1 [94][95][96][97]. Moreover, the Raman spectra of all DLC-coated specimens showed strong similarities with two pronounced peaks around 1360 and 1560 cm −1 , which are typical positions for the D-and G-bands of amorphous carbon coatings [98].…”

Section: Chemical Properties and Cytological Interactionsmentioning

confidence: 99%

Amorphous Carbon Coatings for Total Knee Replacements—Part I: Deposition, Cytocompatibility, Chemical and Mechanical Properties

et al. 2021

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Diamond-like carbon (DLC) coatings have the potential to reduce implant wear and thus to contribute to avoiding premature failure and increase service life of total knee replacements (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt–chromium–molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While a detailed characterization of the tribological behavior is the subject of part II, part I focusses on the deposition of pure (a‑C:H) and tungsten-doped hydrogen-containing amorphous carbon coatings (a‑C:H:W) and the detailed characterization of their chemical, cytological, mechanical and adhesion behavior. The coatings are fabricated by physical vapor deposition (PVD) and display typical DLC morphology and composition, as verified by focused ion beam scanning electron microscopy and Raman spectroscopy. Their roughness is higher than that of the plain substrates. Initial screening with contact angle and surface tension as well as in vitro testing by indirect and direct application indicate favorable cytocompatibility. The DLC coatings feature excellent mechanical properties with a substantial enhancement of indentation hardness and elastic modulus ratios. The adhesion of the coatings as determined in modified scratch tests can be considered as sufficient for the use in TKAs.

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“…The UHMWPE fiber is a flexible polymer material composed of methylene, which has no polar group and weak intermolecular force. [37] The main component of aramid fiber is poly-p-phenylene terephthamide, [38] which has dense packing structure of macromolecules. Therefore, the AKS series exhibits higher stiffness, which is consistent with the above stiffness calculation.…”

Section: Static Compression Of Composite Spring With "Skin-core" Structurementioning

confidence: 99%

Composite helical spring with skin‐core structure: Structural design and compression property evaluation

et al. 2020

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The helical spring is an essential mechanical component of automobile and machinery and has been widely used in industrial application. The weight reduction is the requirement of current material design and also the research trend for material development. In this study, a novel composite helical spring with "skin-core" structure was designed and fabricated with an integrated formation process based on the vacuum-assisted resin infusion technology. Based on the different function of skin and core, the skin structure was weft knitting tube made of aramid and ultra-high molecular weight polyethylene fiber, and the core structure was unidirectional carbon fiber. By selecting material for knitting tube and adjusting the volume content of carbon fiber core, the static and fatigue compression properties of composite helical spring were investigated. It has been found that the spring torsion and bending performance can be improved by wrapping the core with the knitting tube as the spring wire. Moreover, the finite element method was applied to further analyze the stress evolution of the "skin-core" composite helical spring during compression and fatigue. The results of compression test and simulation show that the spring stiffness can be effectively improved by using knitting tube and increasing the content of carbon fiber. The stress of the spring cross section is concentrated in the internal radial region of 180 , and the distribution of the corresponding cross sections is relatively uniform. The "skin-core" structure with aramid knitting tube as the outer skin and carbon fiber as the spring core significantly improves the load-carrying capacity and stability of the composite spring. The proposed lightweight helical composite could provide a replacement strategy of existing metal or unidirectional filament reinforced springs used in the engineering applications.

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Phase morphology and tribological properties of PI/UHMWPE blend composites

Cited by 21 publications

References 33 publications

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Amorphous Carbon Coatings for Total Knee Replacements—Part I: Deposition, Cytocompatibility, Chemical and Mechanical Properties

Composite helical spring with skin‐core structure: Structural design and compression property evaluation

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