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Effect of Diamond like Carbon Coating Thickness on Stainless Steel Substrate
Abdul Wasy(압둘와지),Balakrishnan G(발라크리쉬난),Y.Q. Wang(왕일기),J.I. Song(송정일),S.H. Lee(이승훈),J.K. Kim(김종국),D.G. Kim(김도근),T.G. Kim(김태규) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
Diamond like carbon coatings have excellent wear properties with high hardness. The hardness and adhesion properties vary with sp3/sp2 ratio and coating thickness. In this research, effect of coating thickness on stainless steel substrate has studied. Diamond like carbon coatings of 300nm, 500nm, and 650nm has deposited using Filter Cathodic Vacuum Arc System with Magnetron sputtered Chromium interlayer. The characterization includes, Field Emission Electron Microscopy, Raman spectroscopy, Tribology and Adhesion strength evaluation. It was concluded that, surface finish decreased with increase in coating thickness. Maximum ID/IG of 0.84 was obtained for 30nm diamond like carbon coated stainless steel. The minimum average friction coefficient of 0.115 was obtained for 500nm coating. Moreover, it was observed that, friction coefficient decrease with increase in coating thickness in initial phases, after certain time it increase directly proportional to thickness. For adhesion strength, LC1 was found good for 650nm and LC2 for 500nm respectively.
압둘와지지아(Abdul Wasy),발라크리쉬난(Balakrishnan G),김진우(Kim Jin-Woo),원천(Won Cheon),송정일(Jung-Il Song) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
In this study, finite element analysis of LPG cylinder is performed to enhance the service life. Maximum von mises, longitudinal, hoop stresses and deformation is analyzed to predict the structural failure at services, Test, minimum burst and expected burst pressures of 2, 3, 6 and 8 MPa respectively. The main components of LPG cylinder are inner high density polyethylene (HDPE) liner, upper cap assembly, winded composite layer and composite center hoop, which are designed in 3-D modeling software and then finite element analysis is performed on them. After number of analysis, the material properties are suggested as E-glass/Vinylester from 70° to 20° fiber angle from upper to lower side. The helical part of cylinder has a layer of E-glass/Vinylester 15° and an extra layer of hoop part with E-glass/Vinylester 90°. The von mises criteria predicts that the weakest point of structure lies in the compostie hoop, so it is recommended to make this part strengthen as much as possible.