The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform

Seock Sam Kim - One of the best experts on this subject based on the ideXlab platform.

  • improvement of tribological characteristics of multi scale laser textured Surface in terms of lubrication regime
    Journal of the Korean Society of Tribologists and Lubrication Engineers, 2014
    Co-Authors: Jonghyoung Kim, Si Geun Choi, Dawit Zenebe Segu, Yongsub Jung, Seock Sam Kim
    Abstract:

    Laser Surface Texturing(LST) is a Surface Engineering Process used to improve tribological characteristicsof materials by creating patterned microstructures on the mechanical contact Surface. In LST technology, a pulsatedlaser beam is used to create arranged dimples on a Surface by a material ablation Process, which can improve such asload capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect ofmulti-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on the bearing steel(AISI52100) to create arranged dimples. To optimize the Surface texturing effect on friction, multi-scale texture dimples withsome specific formula arrays were fabricated by combining circles, ellipses and the laser ablation Process. The tri-bological testing of multi-scale textured Surface was performed by a flat-on-flat unidirectional tribometer under lubri-cation and the results compared with that of the non-textured Surface. Through an increase in sliding speed, thebeneficial effect of multi-scale LST performance was achieved. The multi-scale textured Surface had lower frictioncoefficient performances than the non-textured Surface due to the hydrodynamic lubrication effect.Keywords: laser Surface texture (레이저 표면 텍스처), lubrication regime (윤활영역), friction (마찰), Surfacemodification (표면개질)

  • The effect of multi-scale laser textured Surface on lubrication regime
    Applied Surface Science, 2013
    Co-Authors: Dawit Zenebe Segu, Si Geun Choi, Jae Hyouk Choi, Seock Sam Kim
    Abstract:

    Abstract Laser Surface texturing (LST) is a Surface Engineering Process used to improve tribological characteristics of materials by creating patterned microstructures on the mechanical contact Surface. In LST technology, a pulsated laser beam is used to create arranged dimples on Surface by a material ablation Process, which can improve load capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect of multi-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on steel (AISI 52100) to create arranged dimples. To optimize the Surface texturing effect on friction, multi-scale texture dimples with some specific formula arrays were fabricated by laser ablation Process by combining circles and ellipses. The tribological testing of multi-scale textured Surface was performed by a flat-on-flat unidirectional tribometer under lubrication, and the results compared with that of untextured Surface. Through an increase in sliding speed and dimple depth the beneficial effect of multi-scale LST performance was achieved. The multi-scale textured Surface had lower friction coefficient performance than the untextured Surface due to hydrodynamic lubrication effect.

Dawit Zenebe Segu - One of the best experts on this subject based on the ideXlab platform.

  • improvement of tribological characteristics of multi scale laser textured Surface in terms of lubrication regime
    Journal of the Korean Society of Tribologists and Lubrication Engineers, 2014
    Co-Authors: Jonghyoung Kim, Si Geun Choi, Dawit Zenebe Segu, Yongsub Jung, Seock Sam Kim
    Abstract:

    Laser Surface Texturing(LST) is a Surface Engineering Process used to improve tribological characteristicsof materials by creating patterned microstructures on the mechanical contact Surface. In LST technology, a pulsatedlaser beam is used to create arranged dimples on a Surface by a material ablation Process, which can improve such asload capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect ofmulti-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on the bearing steel(AISI52100) to create arranged dimples. To optimize the Surface texturing effect on friction, multi-scale texture dimples withsome specific formula arrays were fabricated by combining circles, ellipses and the laser ablation Process. The tri-bological testing of multi-scale textured Surface was performed by a flat-on-flat unidirectional tribometer under lubri-cation and the results compared with that of the non-textured Surface. Through an increase in sliding speed, thebeneficial effect of multi-scale LST performance was achieved. The multi-scale textured Surface had lower frictioncoefficient performances than the non-textured Surface due to the hydrodynamic lubrication effect.Keywords: laser Surface texture (레이저 표면 텍스처), lubrication regime (윤활영역), friction (마찰), Surfacemodification (표면개질)

  • The effect of multi-scale laser textured Surface on lubrication regime
    Applied Surface Science, 2013
    Co-Authors: Dawit Zenebe Segu, Si Geun Choi, Jae Hyouk Choi, Seock Sam Kim
    Abstract:

    Abstract Laser Surface texturing (LST) is a Surface Engineering Process used to improve tribological characteristics of materials by creating patterned microstructures on the mechanical contact Surface. In LST technology, a pulsated laser beam is used to create arranged dimples on Surface by a material ablation Process, which can improve load capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect of multi-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on steel (AISI 52100) to create arranged dimples. To optimize the Surface texturing effect on friction, multi-scale texture dimples with some specific formula arrays were fabricated by laser ablation Process by combining circles and ellipses. The tribological testing of multi-scale textured Surface was performed by a flat-on-flat unidirectional tribometer under lubrication, and the results compared with that of untextured Surface. Through an increase in sliding speed and dimple depth the beneficial effect of multi-scale LST performance was achieved. The multi-scale textured Surface had lower friction coefficient performance than the untextured Surface due to hydrodynamic lubrication effect.

Si Geun Choi - One of the best experts on this subject based on the ideXlab platform.

  • improvement of tribological characteristics of multi scale laser textured Surface in terms of lubrication regime
    Journal of the Korean Society of Tribologists and Lubrication Engineers, 2014
    Co-Authors: Jonghyoung Kim, Si Geun Choi, Dawit Zenebe Segu, Yongsub Jung, Seock Sam Kim
    Abstract:

    Laser Surface Texturing(LST) is a Surface Engineering Process used to improve tribological characteristicsof materials by creating patterned microstructures on the mechanical contact Surface. In LST technology, a pulsatedlaser beam is used to create arranged dimples on a Surface by a material ablation Process, which can improve such asload capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect ofmulti-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on the bearing steel(AISI52100) to create arranged dimples. To optimize the Surface texturing effect on friction, multi-scale texture dimples withsome specific formula arrays were fabricated by combining circles, ellipses and the laser ablation Process. The tri-bological testing of multi-scale textured Surface was performed by a flat-on-flat unidirectional tribometer under lubri-cation and the results compared with that of the non-textured Surface. Through an increase in sliding speed, thebeneficial effect of multi-scale LST performance was achieved. The multi-scale textured Surface had lower frictioncoefficient performances than the non-textured Surface due to the hydrodynamic lubrication effect.Keywords: laser Surface texture (레이저 표면 텍스처), lubrication regime (윤활영역), friction (마찰), Surfacemodification (표면개질)

  • The effect of multi-scale laser textured Surface on lubrication regime
    Applied Surface Science, 2013
    Co-Authors: Dawit Zenebe Segu, Si Geun Choi, Jae Hyouk Choi, Seock Sam Kim
    Abstract:

    Abstract Laser Surface texturing (LST) is a Surface Engineering Process used to improve tribological characteristics of materials by creating patterned microstructures on the mechanical contact Surface. In LST technology, a pulsated laser beam is used to create arranged dimples on Surface by a material ablation Process, which can improve load capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect of multi-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on steel (AISI 52100) to create arranged dimples. To optimize the Surface texturing effect on friction, multi-scale texture dimples with some specific formula arrays were fabricated by laser ablation Process by combining circles and ellipses. The tribological testing of multi-scale textured Surface was performed by a flat-on-flat unidirectional tribometer under lubrication, and the results compared with that of untextured Surface. Through an increase in sliding speed and dimple depth the beneficial effect of multi-scale LST performance was achieved. The multi-scale textured Surface had lower friction coefficient performance than the untextured Surface due to hydrodynamic lubrication effect.

Jae Hyouk Choi - One of the best experts on this subject based on the ideXlab platform.

  • The effect of multi-scale laser textured Surface on lubrication regime
    Applied Surface Science, 2013
    Co-Authors: Dawit Zenebe Segu, Si Geun Choi, Jae Hyouk Choi, Seock Sam Kim
    Abstract:

    Abstract Laser Surface texturing (LST) is a Surface Engineering Process used to improve tribological characteristics of materials by creating patterned microstructures on the mechanical contact Surface. In LST technology, a pulsated laser beam is used to create arranged dimples on Surface by a material ablation Process, which can improve load capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect of multi-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on steel (AISI 52100) to create arranged dimples. To optimize the Surface texturing effect on friction, multi-scale texture dimples with some specific formula arrays were fabricated by laser ablation Process by combining circles and ellipses. The tribological testing of multi-scale textured Surface was performed by a flat-on-flat unidirectional tribometer under lubrication, and the results compared with that of untextured Surface. Through an increase in sliding speed and dimple depth the beneficial effect of multi-scale LST performance was achieved. The multi-scale textured Surface had lower friction coefficient performance than the untextured Surface due to hydrodynamic lubrication effect.

Manoj Masanta - One of the best experts on this subject based on the ideXlab platform.

  • Effect of pulse laser parameters on TiC reinforced AISI 304 stainless steel composite coating by laser Surface Engineering Process
    Optics and Lasers in Engineering, 2015
    Co-Authors: Chinmaya Kumar Sahoo, Manoj Masanta
    Abstract:

    Abstract In this work, TiC reinforced steel composite layer has been produced by laser scanning over the preplaced TiC powder on AISI 304 steel substrate, using a pulse Nd:YAG laser. Depending on the pulse laser parameters, TiC either deposited or dispersed on the Surface of steel substrate. Depth and width of laser Processed TiC–steel composite layer has been deliberated from the SEM images at the transverse cross section of the laser scanned samples. Hardness of the laser Processed composite layer has been measured through Vickers micro-hardness tester. Effect of pulsed laser parameters i.e. peak power, pulse duration, overlapping factor (corresponding to scan speed and frequency) on micro-hardness, composite layer profile (depth and width) and microstructure of the laser Processed TiC–steel composite layer has been studied. From the experimental analysis, it is revealed that, laser peak power and overlapping factor have significant effect on the TiC–steel composite layer profile and its hardness value.