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- 저자 : Özkan Küçük (검색결과 2 건)
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Application of Taguchi method in the optimization of dissolution of ulexite in NH4Cl solutions
Özkan Küçük 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.1
Taguchi method was used to determine optimum conditions for the dissolution of ulexite in NH4Clsolutions. The ranges of experimental parameters were betwen 50-87oC for reaction temperature, 0.05-0.20 g·mL14Cl concentration, 5-25 min for reaction time, and (850+600)-(90) m forparticle size. The optimum conditions for these parameters were found to be 87oC, 0.05 g·mL1, 4 M, (30+212)m, and 18 minutes, respectively. Under these conditions, the dissolution percentage of ulexite in NH4Cl solution was98.37. Reaction products were found to be boric acid, ammonium tetraborates, sodium tetraborate decahydrate, calciumchloride, and sodium chloride.
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Ferhat Bülbül,Hikmet Altun,Özkan Küçük,Vefa Ezirmik 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
This study aims to evaluate the tribological and corrosion properties of the electroless Ni-B coating deposited on AISI 304 stainless steels. The microstructure of the coating was characterized using x-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS). XRD analysis revealed that the prepared coating possessed an amorphous character. SEM-EDS investigation also indicated that a non-stoichiometric Ni-B coating was deposited with a columnar growth mechanism on the stainless steel substrate and the morphology of the growth surface was blackberry-like. The hardness and tribological properties were characterized by microhardness and a pin-on-disc wear test. The electroless Ni-B coated sample had a higher degree of hardness, a lower friction coefficient and a lower wear rate than the uncoated substrate. The electrochemical potentiodynamic polarization method was used to evaluate the corrosion resistance of the coating. The electroless Ni-B coating offered cathodic protection on the substrate by acting as a sacrificial anode although it was electrochemically more reactive than the stainless steel substrate.
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