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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.
하선호(Sung-Ho Ha),이동우(Dong-Woo Lee),압둘 와지 지아(Abdul Wasy Zia),송정일(Jung-Il Song) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
Ball Valves are being used as a key element in the process industries. The industrial development of valves has increased steadily and it requires high design reliability with long service life. Currently, the development of a high performance valves is not easy because of the lack of technology in Korea. Valves are being imported up to 58 percent of domestic market having worth of almost 7 million US dollars. Therefore, in this work, improvement of the design and performance of industrial valves gad studied to achieve longer service life and best output during operation. The structural stability was evaluated using ANSYS FSI(Fluid-Structural Interaction) module. Moreover, torque analysis simulation was performed to compare software and experimental results to obtain maximum product reliability. This simulation results were used to predict the change in torque by change in shape, thereby, reducing the time and cost of manufacturing number of protypes for experimental validation.
하선호(Sun-Ho Ha),이동우(Dong-Woo Lee),아따 울 레만(Atta Ur Rehman),압둘 와지(Abdul Wasy),송정일(Jung-Il Song) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.4
Zirconia is well known in industrial applications for its mechanical characteristics. DLC (diamond-like carbon) have high elastic modulus, high electric resistivity, high dielectric constant, high wear resistance, low friction coefficient, bio compatibility, chemically inert and thermally stable. Because of all these physical and chemical properties these types of coatings have become key procedure for thin coating. Friction coefficient of DLC films is already evaluated and the current work is a further advancement by calculating the fracture toughness and wear resistance of these coatings. In the present study DLC thin film coatings are developed on ZrO₂ alloy surface using Plasma Enhanced Chemical Vapor Deposition (PECVD) method. Vicker hardness test is employed and it was concluded that, DLC coatings increase the Vickers hardness of ceramics.