16368

14595

كارشناسي ارشد

نساجي - الياف

اصفهان : دانشگاه صنعتي اصفهان

1399

هشت، 103ص. : مصور، جدول، نمودار

كميل نصوري

مصطفي يوسفي، محسن شنبه

1399/12/23

كتابنامه

مهندسي نساجي

مهندسي نساجي

1399/12/23

2681263

Designing modeling and manufacturing of nickel coated carbon fabric for radar absorbing application Ayoub Darvishzadeh ayoobdvz@yahoo com Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language PersianSupervisor Dr Komeil Nasouri k nasouri@iut ac ir AbstractComposites of carbon fibers CFs and magnetic metals have concerned attention fortunable microwave absorption materials MAMs In this work magnetic nickel Ni particles were coated on the CFs surface by an electroplating technique Some importantparameters for nickel deposition of the CFs surface were analyzed and optimized Theinfluence of current density temperature and time on the weight gain and electricalconductivity of nickel coated CFs has been investigated The temperature of theelectroplating bath has no significant effects on the weight gain and the applied currentdensity and time only control the weight of the samples The special effects of the currentdensity and time are higher than that of temperature on the electrical conductivity As forsurface morphology results the smooth and micro cone shapes were formed with lowerand higher values of electroplating parameters respectively The optimization resultsshowed that the most optimal weight gain and electrical conductivity were to be 38 wt and 585 S cm respectively and achieved at the electrical current density of 2 5 A dm2 theelectroplating temperature of 25 C and time of 20 min The shielding efficiency SE ofoptimized nickel coated CFs increased up to 63 71 dB Moreover different morphologyof Ni coated CFs was established by setting the plating time The microstructure electricand magnetic properties complex permittivity and permeability and reflection loss RL of the Ni coated CFs were specified as a function of the surface morphology ofcomposites The creation of a magnetic Ni layer onto CFs improved composite properties not only raising the saturation magnetization 17 46 emu g but also enhancing electricalconductivity 361 594 S cm The minimum RL could reach up to 64 8 dB at 14 9 GHzwith 2 0 mm matching thickness and high effective bandwidth of 2 2 18 0 GHz It has beendisplayed that the properties of Ni coated CFs can be effectively controlled by changingthe morphology of the Ni layer which provides a novel route to fabricate Ni coated CFswith tunable and broadband microwave absorption properties Key words Carbon fibers Nickel Electroplating Modeling Impedance matching Microwave absorption

كميل نصوري

مصطفي يوسفي، محسن شنبه