• Title, Summary, Keyword: Surface morphology

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Application of Fractal Dimension for Rubbed Surface Morphology of Hydraulic Members

  • Luy, M.R.;Jun, S.J.;Cho, Y.S.;Park, H.S.
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.257-258
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    • 2002
  • The surface morphology of oil-lubricated surface for hydraulic piston motor is believed to be extremely effective in contact mechanics. adhesion. friction and wear. In order to describe morphology of various rubbed surface on driving condition, the wear test was carried out under different experimental conditions in oil-lubricated system. And fractal descriptors was applied to rubbed surface of hydraulic members with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Morphology of rubbed surface can be effectively obtained by fractal dimension.

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A Study on the Functional Electroless Ni Plating for Controled Morphology on the CBN Powder (CBN분말상에 석출형상 제어를 위한 무전해 기능성 니켈합금도금에 관한 연구)

  • Chu, H.S.;Kim, D.K.
    • Journal of the Korean institute of surface engineering
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    • v.41 no.6
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    • pp.312-324
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    • 2008
  • In this study, the functional property as a super abrasive material was secured for CBN powder by the electroless Ni-P plating on the surface of the particle. The plating solution has been prepared to control the surface morphology by regulating surfactants and process conditions. The effects of processing parameters on the surface morphology of CBN powder was discussed. The results are summarized as follows; A stable plating tendency was achieved from 1 hour after quantitatively dropping reducing agent. It was observed that more than 50% of the weight gain was obtained by Ni-P coating on the surface of CBN super abrasive powder. The morphology of the Ni-P coating layer is consisted of botryoidal and spiky type and it could be controlled by regulating processing parameters. Superior characteristic in terms of surface morphology was found in the nonionic surfactant XL-80N. It was found that XL-80N considerably decreased surface tension of CBN powder and Ni-P alloy surface then enhance wettability as well as plating rate. Metal coated CBN powder as a raw material of resin bond wheel has been developed through this investigation.

Fractal Dimension for Morphology Analysis of Rubbed Surface with Hydraulic Members

  • Cho, Yon-Sang;Seo, Young-Baek;Park, Heung-Sik
    • KSTLE International Journal
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    • v.3 no.2
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    • pp.75-78
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    • 2002
  • The surface morphology of oil-lubricated surfaces fer hydraulic piston motors is believed to be extremely effective in contact mechanics, adhesion, friction and weak In order to describe morphology of various rubbed surfaces on driving conditions, the wear test was carried out under different experimental conditions in an oil-lubricated system. And fractal descriptors were applied to rubbed surfaces of hydraulic members and analyzed through an image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimensions can be determined by sum of intensity difference of surface pixel. The morphology of rubbed surfaces can be effectively obtained by fractal dimension.

Morphological Analysis of Oil-Lubricated Surface for Hydraulic Piston Motor (유압 피스톤 모터의 윤활 마찰면 상태 해석)

  • 배효준;강인혁;박정록;박흥식;전태옥
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.290-295
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    • 2001
  • The surface morphology of oil-lubricated surface for hydraulic piston motor is believed to be extremely effective in contact mechanics. adhesion, friction and wear. In order to describe morphology of various rubbed surface on driving condition, the wear test was carried out under different experimental conditions in oil-lubricated system. And fractal descriptors was applied to rubbed surface of hydraulic driving material with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Morphology of rubbed surface can be effectively obtained by fractal dimensions.

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Morphological Analysis of the Rubbed Surface for Hydraulic Driving Material (유압구동 부재의 마찰면 형상해석)

  • 원두원;배효준;조연상;박흥식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.404-409
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    • 2000
  • The determination of surface morphology is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe morphology of various rubbed surface, the wear test was carried out under different experimental conditions in lubricating wear. And fractal descriptors was applied to rubbed surface of hydraulic driving material with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Morphology of rubbed surface can be effectively obtained by fractal dimensions.

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Morphological Analysis of Hydraulic Driving Surface using Fractal Dimension (프랙탈 차원을 이용한 유압구동 습동면의 형상해석)

  • 전성재;배효준;김동호;서영백;박흥식
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.23-28
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    • 2000
  • The determination of surface morphology is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe morphology of various rubbed surface, the wear test was carried out under different experimental conditions in lubricating wear. And fractal descriptors was applied to rubbed surface of hydraulic driving material with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Morphology of rubbed surface can be effectively obtained by fractal dimensions.

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Effect of Improved Surface Wetability and Adhesion of Undulated Diamond-like Carbon Structure with r.f. PE-CVD

  • Jang, Young-Jun;Kim, Seock-Sam
    • KSTLE International Journal
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    • v.9 no.1_2
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    • pp.22-25
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    • 2008
  • This paper investigated the wetting and adhesion property of undulated DLC film with surface morphology controlled for a reduced real area of contact. The undulated DLC Films were prepared by 13.56 MHZ radio frequency plasma enhanced chemical vapor deposition (r.f. PECVD) by using nanoscale Cu dots surface on a Si (100) substrate. FE-SEM, AFM analysis showed that the after repeated deposition and plasma induced damage with Ar ions, the surface was nanoscale undulated. This phenomenon changed the surface morphology of DLC surface. Raman spectra of film with changed morphology revealed that the plasma induced damage with Ar ions significantly suppressed the graphitization of DLC structure. Also, it was observed that while the untreated flat DLC surfaces had wetting angle starting ranged from $72^{\circ}$ and adhesion force of 333ni. Had wetting angle the undulated DLC surfaces, which resemble the surface morphology of a cylindrical shape, increased up to $104^{\circ}$ and adhesion force decreased down to 11 nN. The measurements agree with Hertz and JKR models. The surface undulation was affected mainly by several factors: the surface morphology affinity to cylindrical shape, reduction of the real area of contact and air pockets trapped in cylindrical asperities of the surface.

Optical Property and Surface Morphology Control by Randomly Patterned Etching (불규칙 패턴 에칭에 의한 표면 형상 제어와 광학적 특성)

  • Kim, Sung Soo;Lee, Jeong Woo;Jeon, Bup Ju
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.12
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    • pp.800-805
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    • 2017
  • Randomly patterned and wet chemical etching processes were used to treat anti-glare of display cover glasses. The surface and optical properties of grain size and surface morphology controlled by randomly patterned etching and wet chemical solution etching were investigated. The surface morphology and roughness of the etched samples were examined using a spectrophotometer and a portable surface roughness (Ra) measuring instrument, respectively. The gloss caused by reflection from the glass surface was measured at $60^{\circ}$ using a gloss meter. The surface of the sample etched by the doctor-blade process was more uniform than that obtained from a screen pattern etching process at gel state etching process of the first step. The surface roughness obtained from the randomly patterned etching process depended greatly on the mesh size, which in turn affected the grain size and pattern formation. The surface morphology and gloss obtained by the etching process in the second step depended primarily on the mesh size of the gel state etching process of the first step. In our experimental range, the gloss increased on decreasing the grain size at a lower mesh size for the first step process and for longer reaction times for the second step process.

Effect of Surface Treatment on the Morphology and Mechanical Behavior of Torayca T300 Carbon Fiber (표면처리가 Torayca T300 탄소섬유의 Morphology 및 역학적 거동에 미치는 영향)

  • Park, Jong-Rae;Im, Sun-Ho
    • Textile Science and Engineering
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    • v.33 no.11
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    • pp.997-1003
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    • 1996
  • The effect of surface treatment at high temperatures on the morphology and mechanical behavior of Torayca T300 carbon fiber is studied. It is found that the surface treatment results in a considerable change in the surface and cross-sectional morphology of the carbon fiber. Accordingly, there are sizable change in mechanical properties of the fiber: in particular, compressional failure mechanism changes from buckling to simple shear mode as the surface treatment temperature increases. There is not an apparent relationship between the surface structural parameters such as surface area, pore volume, etc. and the mechanical properties such as tensile and compressive strengths.

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Surface morphology, Glossiness and Hardness of Zn-Cr and Zn-Cr-X ternary alloy Electrodeposits (고속도금된 Zn-Cr 및 Zn-Cr-X 3원합금 도금층의 표면조직, 광택도 및 경도)

  • 예길촌;김대영;서경훈
    • Journal of the Korean institute of surface engineering
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    • v.36 no.5
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    • pp.379-385
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    • 2003
  • The surface morphology, the glossiness and the hardness of Zn-Cr and Zn-Cr-X(X:Co, Mn) alloy electrodeposits were investigated by using chloride bath with EDTA additive and flow cell system. The surface morphology of Zn-Cr alloy and Zn-Cr-Mn alloy changed from fine needle shape crystalline structure to colony structure of fine granular crystallites with increasing current density in the range of 20-100 $A/dm^2$. The surface morphology of Zn-Cr-Co alloy deposited from low Co concentration bath(2.5-10 g/$\ell$) was similar to that of Zn-Cr alloy, while that of Zn-Cr-Co alloy deposited from high cobalt concentration bath was fine granular crystalline structure in the same range of current density. The glossiness of Zn-Cr and Zn-Cr-Mn alloy increased noticeably with increasing current density, while that of Zn-Cr-Mn alloy decreased with increasing Mn concentration of bath in high current density region. The glossiness of Zn-Cr-Co alloy deposited from low Co concentration bath increased with current density while that of the alloy from high Co concentration bath decreased with increasing current density. The hardness of Zn-Cr and Zn-Cr-X alloy increased noticeably with current density.