DLC and UHMWPE as hard/soft composite film on Si for improved tribological performance

Minn, Myo; Sinha, Sujeet K.

doi:10.1016/j.surfcoat.2008.01.012

Cited by 42 publications

(29 citation statements)

References 17 publications

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“…Since its development in the early 1950s, ultra-high molecular weight polyethylene (UHMWPE) has gained popularity owing to its bio-compatibility [1][2][3][4], self-lubricating properties [5], chemical stability [6], and wear and impact resistance, thereby making it an excellent choice for a range of engineering and biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications

Mohammed

2018

Coatings

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Due to a growing demand for protecting metallic components from wear and tear, polymer coatings are being extensively researched and developed as one of the most effective and efficient solutions to reduce friction and wear in demanding tribological applications. The present study focuses on developing a polymer nanocomposite coating of ultra-high molecular polyethylene (UHMWPE) reinforced with different loadings (0.5, 3, 5, and 10 wt %) of alumina to protect steel surfaces. Wear tests were conducted on the coated samples using a tribometer with a ball-on-disk configuration, sliding against a 440C hardened stainless steel ball as a counterface to evaluate the wear life and the load-bearing capacity of the developed coatings. Micro-indentation, energy dispersive X-ray spectroscopy, scanning electron microscopy, and optical profilometry techniques were used to characterize the coatings in terms of hardness, dispersion of the nanofillers, morphology, and wear mechanisms, respectively. Results showed that the UHMWPE nanocomposite coating reinforced with 3 wt % and 5 wt % of alumina did not fail, even until 250,000 cycles at a normal load of 12 N and a linear speed of 0.1 m/s, showing a significant improvement in wear resistance as compared to the pristine UHMWPE coating.

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Section: Introductionmentioning

confidence: 99%

UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications

Mohammed

2018

Coatings

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“…The cleaning and coating procedures are provided in Ref. [3,26]. The thickness of the UHMWPE film used in this study was 12.3 lm and its initial roughness (R a ) was 0.56 lm, measured within a scan area of 10 lm 9 10 lm using an AFM.…”

Section: Methodsmentioning

confidence: 99%

“…The molecular orientation of PTFE has been widely studied by Tabor's and Tanaka's groups [24,25] in 1970s in which they showed the polymer molecule orientation along the sliding direction. Recently, we have studied UHMWPE as a thin film and investigated its friction and wear properties on different substrates, different thicknesses, and different surface energies using continuous sliding tests [2,3,26]. Our studies have shown that the crystallinity and molecular orientation of the polymer changes as the sliding progresses in one direction.…”

Section: Introductionmentioning

confidence: 97%

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Molecular Orientation, Crystallinity, and Topographical Changes in Sliding and their Frictional Effects for UHMWPE Film

Minn

Sinha

2009

Tribol Lett

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This paper presents a study on the frictional anisotropy of semi-crystalline UHMWPE polymer film deposited on DLC-overcoated Si substrate. For UHMWPE film slid against a silicon nitride ball, there is a remarkable difference in the coefficient of friction between the forward and reverse directions after the slider has been initially slid against the film for certain number of cycles. The changes in the friction are greatly influenced by the initial number of sliding cycles. This frictional behavior is explained in terms of crystallinity change and molecular orientational effects on UHMWPE and micro-topographical effects due to the initial sliding. Nanoscratch test is conducted to understand the friction of the polymer film in the sliding track and the data are compared with the macroscale friction data. The results show that the friction in the reverse of the initial sliding direction is high in comparison to that in the forward direction and this behavior mainly depends upon the number of initial sliding cycles. The initial sliding cycles affect the crystallinity and molecular orientation of the film, as well as the film topography. This combined effect on the polymer film results in an anisotropic frictional behavior of the film.

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“…In some applications, they must also be biocompatible. In almost all contexts, the films must meet an optimal thickness [1][2][3][4][5] often with very low surface roughness. One material meets almost all of these requirements: diamond.…”

Section: Introductionmentioning

confidence: 99%

Sputtered Tungsten-Based Ternary and Quaternary Layers for Nanocrystalline Diamond Deposition

Walock¹,

Rahil²,

Zou³

et al. 2012

j. nanosci. nanotech.

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Many of today's demanding applications require thin-film coatings with high hardness, toughness, and thermal stability. In many cases, coating thickness in the range 2-20 m and low surface roughness are required. Diamond films meet many of the stated requirements, but their crystalline nature leads to a high surface roughness. Nanocrystalline diamond offers a smoother surface, but significant surface modification of the substrate is necessary for successful nanocrystalline diamond deposition and adhesion. A hybrid hard and tough material may be required for either the desired applications, or as a basis for nanocrystalline diamond film growth. One possibility is a composite system based on carbides or nitrides. Many binary carbides and nitrides offer one or more mentioned properties. By combining these binary compounds in a ternary or quaternary nanocrystalline system, we can tailor the material for a desired combination of properties. Here, we describe the results on the structural and mechanical properties of the coating systems composed of tungstenchromium-carbide and/or nitride. These WC-Cr-(N) coatings are deposited using magnetron sputtering. The growth of adherent nanocrystalline diamond films by microwave plasma chemical vapor deposition has been demonstrated on these coatings. The WC-Cr-(N) and WC-Cr-(N)-NCD coatings are characterized with atomic force microscopy and SEM, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and nanoindentation.

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DLC and UHMWPE as hard/soft composite film on Si for improved tribological performance

Cited by 42 publications

References 17 publications

UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications

UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications

Molecular Orientation, Crystallinity, and Topographical Changes in Sliding and their Frictional Effects for UHMWPE Film

Sputtered Tungsten-Based Ternary and Quaternary Layers for Nanocrystalline Diamond Deposition

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