The Experts below are selected from a list of 7941 Experts worldwide ranked by ideXlab platform

Sanna Tervakangas - One of the best experts on this subject based on the ideXlab platform.

  • dlc treated aramid fibre composites tailoring nanoscale Coating for macroscale performance
    Composites Science and Technology, 2019
    Co-Authors: Mikko Kanerva, Samuli Korkiakoski, Kimmo Lahtonen, Jarno Jokinen, Sarianna Palola, A Iyer, Pekka Laurikainen, Marianna Raappana, Essi Sarlin, Sanna Tervakangas
    Abstract:

    Abstract This work aims to quantify the effect of a Diamond-Like Carbon Coating (DLC) treatment of aramid fibres and to reveal the conversion of a fibre-level performance leap on the macroscale mechanical behaviour. The DLC-based Coating is applied directly to the reinforcement and laminates are infused with an epoxy matrix. After characterisation of the coated surfaces, the performance of the composite is analysed via interlaminar shear testing, fatigue testing and damage tolerance testing, microbond tests, and 3D finite element simulation using a cohesive zone model of the interface. The results show that the Coating treatment improves the fatigue life and the S-N curve slope for the laminates, while the residual strength after impact damage and environmental conditioning (water immersion at 60 °C) remains high. The scaling factor to convert the performance on macroscale was determined to be 0.17–0.39 for the DLC-based fibre treatment.

N. W. M. Zulkifli - One of the best experts on this subject based on the ideXlab platform.

  • an updated overview of diamond like Carbon Coating in tribology
    Critical Reviews in Solid State and Materials Sciences, 2015
    Co-Authors: K Al A H Mahmud, H H Masjuki, M. A. Kalam, H M Mobarak, N. W. M. Zulkifli
    Abstract:

    During the last two decades, the industry (including scientists) has focused on Diamond-Like Carbon (DLC) Coating because of its wide range of application in various fields. This material has numerous applications in mechanical, electrical, tribological, biomedical, and optical fields. Severe friction and wear in some machine parts consumes high amount of energy, which makes the process energy inefficient. Thus, DLC Coating can be an effective means to lower the friction and wear rate. Some important process variables that affect the tribological characteristics of DLC Coating are adhesion promoter intermediate layer, substrate surface roughness, hydrogen incorporation or hydrogen non involvement, and Coating deposition parameters (e.g., bias voltage, etching, current, precursor gas, time, and substrate temperature). Working condition of DLC-coated parts also affects the tribological characteristics, such as temperature, sliding speed and load, relative humidity, counter surface, and lubrication media (DL...

  • tribological characteristics of amorphous hydrogenated a c h and tetrahedral ta c diamond like Carbon Coating at different test temperatures in the presence of commercial lubricating oil
    Surface & Coatings Technology, 2014
    Co-Authors: K Al A H Mahmud, H H Masjuki, M. A. Kalam, M. Varman, H M Mobarak, N. W. M. Zulkifli
    Abstract:

    article i nfo Currently, the application of Diamond-Like Carbon (DLC) Coatings for automotive components is becoming a favorable strategytocopewiththenewchallenges facedbythe automotive industry.DLCCoatingscaneffectively lower the coefficient of friction (CoF) and wear rate of engine components, consequently improving the fuel efficiency and durability of these components. Commercially available fully formulated lubricating oils enhance the lubrication of ferrous materials. Therefore, the interaction between nonferrous Coatings (e.g., DLC) and com- mercial lubricating oil must be investigated. A ball-on-plate tribotester was used to run the experiments using stainless steel plates coated with amorphous hydrogenated DLC (a-C:H) and tetrahedral DLC (ta-C) sliding against a 440C stainless steel ball. Wear track was investigated by scanning electron microscopy and atomic force microscopy. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy were used to analyze the tribofilms inside the wear track. Raman analysis was performed to investigate the structural change of the Coatings. At high temperatures, the CoF decreases but the wear rate increases in the a-C:H and ta-C DLC-coated plates. CoF and wear rate (coated layer and counter surface) are mostly influenced by Coating graphitization. Tribochemical films, such as polyphosphate glass, are formed in ta-C and act as protective layers. Therefore, the wear rate of ta-C DLC is lower than that of a-C:H DLC.

Shinya Sasaki - One of the best experts on this subject based on the ideXlab platform.

  • friction and wear characteristics of a ti containing diamond like Carbon Coating with an srv tester at high contact load and elevated temperature
    Surface & Coatings Technology, 2005
    Co-Authors: Jiahu Ouyang, Shinya Sasaki
    Abstract:

    Abstract The friction and wear characteristics of a Ti-containing Diamond-Like Carbon (Ti-DLC) Coating have been evaluated with a Schwingungs Reibung und Verschleiss (SRV) tester when reciprocating sliding against a steel ball and a CrN-coated pin at high contact load and elevated temperature under a boundary-lubricated condition. The Ti-DLC Coatings exhibit a friction coefficient of 0.06–0.12 and a wear rate of 1.99×10−10 to 9.5×10−7 mm3/N m, depending on the counterfaces, load and temperature. The Ti-DLC/CrN-coated pin pair shows a low friction coefficient than the Ti-DLC/steel ball pair under the identical wear conditions. Increasing the test temperature reduces the coefficient of friction and, however, clearly increases the wear rate of the Ti-DLC Coatings at 20 N. At 50 N and 150 °C, the Ti-DLC Coating was removed completely and the wear was applied to the substrate. At below 100 °C, the wear mechanism of the Ti-DLC Coatings is dominated by surface polishing effects. At 150 °C, brittle fracture, delamination, partial graphitization, and tribo-chemical reactions are found in the tribo-contact areas. The formation of iron oxides on worn surfaces of the Ti-DLC Coatings at 150 °C is attributed to the dissolved oxygen in the oil lubricant and the tribo-chemical reactions. Furthermore, these friction and wear data have been compared quantitatively with pure DLC Coatings and multilayered VTiN Coatings under the identical wear conditions.

Aiying Wang - One of the best experts on this subject based on the ideXlab platform.

  • influence of interlayers on corrosion resistance of diamond like Carbon Coating on magnesium alloy
    Surface & Coatings Technology, 2010
    Co-Authors: Lili Sun, Wei Dai, Lixin Song, Aiying Wang
    Abstract:

    Diamond-Like Carbon Coating (DLC) was deposited on AZ31 magnesium alloy by ion beam deposition technique in this study. A columnar Cr layer with a (110) preferred texture and a columnar CrN layer with a (111) preferred texture were applied as interlayers in the DLC Coating/AZ31 substrate systems. The addition of these interlayers improved the adhesion between Coating and substrate effectively, but did not enhance the corrosion resistance of the DLC/AZ31 systems due to the formation of galvanic cell between substrate and interlayer in the region of through-thickness defects in 3.5 wt.% NaCl solution. In addition, the effect of bias voltage on the corrosion resistance of CrN/Cr Coatings on magnesium alloys was investigated. Although the application of bias voltage induced the Coating denser, it was still difficult for CrN/Cr Coating to reduce the corrosion current density of AZ31 due to the large difference between Coating and substrate in galvanic series.

R D Arnell - One of the best experts on this subject based on the ideXlab platform.

  • the effect of relative humidity on wear of a diamond like Carbon Coating
    Surface & Coatings Technology, 2003
    Co-Authors: Jiaren Jiang, Sam Zhang, R D Arnell
    Abstract:

    Sliding wear behaviour of a Diamond-Like Carbon (DLC) Coating deposited using the combined closed field unbalanced magnetron sputter ion plating and plasma assisted chemical vapour deposition technique has been investigated against tungsten carbide balls in air with various relative humidity (RH) levels as well as in water. A smooth transfer layer was always formed on the ball surface and wear of the ball was negligible. The wear rate of the Coating decreased significantly with increase in RH, with sliding in water showing the lowest wear rate. When sliding in dry air or in a vacuum, the Coating failed very quickly, producing a wear rate of approximately two orders that for sliding in humid air. Under the investigated conditions, sliding speed (0.25 and 0.05 m s ) had no significant effect on the wear behaviour of the DLC Coating in the various environments. The role y1