2 results
Search Results
Now showing 1 - 2 of 2
Conference Object Citation - WoS: 95Citation - Scopus: 101Characterization of Az31 Mg Alloy Coated by Plasma Electrolytic Oxidation(Pergamon-elsevier Science Ltd, 2013) Durdu, Salih; Bayramoglu, Selin; Demirtas, Aysun; Usta, Metin; Ucisik, A. HikmetIn this study, AZ31 Mg alloy produced by twin roll casting was coated by a plasma electrolytic oxidation (PEO) in the solution, consisting of Na2SiO3 center dot 5H(2)O + KOH electrolyte at 0.085 A/cm(2) current density for 15, 30, 45 and 60 min. Thickness of the coated layer, surface morphology, phase structure, hardness, adhesion strength of the layer and wear resistance were analyzed by an eddy current, SEM, XRD, Vickers hardness, micro scratch tester and tribometer, respectively. The average coating thickness ranged from 17 to 56 mu m. A number of pores were formed on the coated layer. XRD revealed that Mg2SiO4 (Forsterite) and MgO (Periclase) phases were formed on the surface of the magnesium alloy. Average coating hardness was measured as 660 HV, while the hardness of the magnesium alloy was 72 HV. Adhesion strength of coatings was increased by increasing duration time. Wear resistances of coatings were higher than AZ31 Mg alloy. (C) 2012 Elsevier Ltd. All rights reserved.Article Citation - Scopus: 2An Environmentally Friendly Method of Cutting and Forming of Materials by Boron Nitride Coated Tools(Inderscience Publishers, 2014) Kaftanoǧlu,B.; Dökmetaş,N.To decrease the undesirable effects on global warming and environmental pollution, manufacturing techniques should aim to use less energy, generate less pollution to the environment and aim at higher performance in shaping and cutting materials. In this paper, a new coating technique is presented for cutting and forming tools so that they can withstand higher temperatures, preserve their surface quality and cutting edge longer and require minimum quantity of lubrication (MQL) and achieve a longer life. It is known that coolants used in manufacturing cause environmental problems and their processing raises the manufacturing cost. Therefore, MQL or dry cutting is preferred if the tool material can withstand the high temperatures. A new technology of boron nitride (BN) coating using a physical vapour deposition (PVD) system is developed. BN coatings are applied on cutting tools and forming dies. Experiments and industrial applications show an increase in tool life. MQL and manufacturing at higher temperatures can be used due to the stability of BN. Copyright © 2014 Inderscience Enterprises Ltd.
