توليد و مشخصه يابي كامپوزيت نانو ساختار ﴿FeNi(WC به روش رسوب دهي الكتريكي با جريان مستقيم و پالسي

چكيده انگليسي :

90 Synthesis and Characterization of Nanostructure Composite FeNi WC using Direct and Pulse Current Electrodepodition Amene Vahidian a vahidian@ma iut ac ir 2014 2 2 Department of Materials Engineering Isfahan University of TechnologyDegree M Sc Language PersianSupervisors Prof Ali Saidi a saeidi@cc iut ac ir Prof Mohamad Ali Golozar golozar@cc iut ac ir Abstract After the twentieth century some important soft magnetic materials such as Fe Ni Co Fe Ni andFe Si alloys were noted due to the continuous development of communication technology magnetic recording and magnetic sensors The iron nickel alloys are used in magnetic sensors Iron nickel alloys have unique features such as low thermal expansion coefficient and softmagnetic properties which are the main reasons for wide application in industry In the first stepof this research iron nickel alloys were produced using direct current electrodeposition Thennanostructure composite of iron nickel tungsten carbide was produced using direct and pulsecurrent electrodepodition in a simple chloride bath Effects of various parameters such as appliedpulse current temperature pH and current density on the composition and morphology of product as well as the current efficiency production rate and specific energy consumption were examined Morphology chemical composition and microstructure of samples were studied by scanningelectron microscopy SEM energy dispersive spectroscopy EDS and x ray diffraction XRD analysis The results obtained from the direct current electrodepodition showed that increasing thepH reduced the iron and increased the nickel in the product The morphology of nanostructurecomposite electrodeposited by pulse current was spherical but for direct current was polyhedral The current efficiency and production rate for nanostructure composite increased and specificenergy consumption decreased as pH increased By increasing temperature current efficiency andproduction rate were reduced and specific energy consumption was increased For the pulseelectrodeposition Ni slightly increased as pH was increased The increase of Ni in nanostructurecomposite obtained by pulse electrodeposition led to change the morphology from spherical to starlike By increasing the electrolyte temperature from 40 C to 70 C nickel content of productincreased from 18 to 61 wt iron content reduced from 74 to 21 wt and tungsten carbideincreased from 8 to 18 wt Also by increasing temprature anomalous electrodeposition wasdeclined Results obtained from applied pulse current showed that the ratio of Ni Fe in products isgreater than direct current The morphology obtained by direct current electrodeposition was moreuniform Lower current efficiency lower production rate and higher specific energy consumptionwere obtained in pulse electrodeposition compared with direct current This could be due to thehigher rate of hydrogen production in pulse current electrodeposition than the direct current one Keywords electrodeposition iron nickel tungsten carbide pulse composite

وحيديان، آمنه

توليد و مشخصه يابي كامپوزيت نانو ساختار ﴿FeNi(WC به روش رسوب دهي الكتريكي با جريان مستقيم و پالسي

آهن-نيكل , كاربيد تنگستن , پالس