WEAR BEHAVOR OF COBALT CONTENT GRADED NCO/SC NANO-COMPASTE COATINGS ON AL SUBSTRAE

سال انتشار: 1390
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 278

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شناسه ملی سند علمی:

UFGNSM03_127

تاریخ نمایه سازی: 10 تیر 1396

چکیده مقاله:

Functionally graded (FG) Ni-Co/SiC nano-composite coatings were electrodeposited on Al substrate using a Watts bath containing 15 g/L SiC nano particles with gradual increasing of cobalt ion concentration into electroplating bath. For comparison, uniform composite coatings were also prepared at various concentrations of cobalt ions. The crystallographic texture and surface morphology of the coatings was studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Microhardness and wear tests were used for investigation of hardness and wear resistance of coatings. The experimental results indicated that by increasing cobalt concentration in electrolyte from 0 to 60 g/L in FGC, the cobalt content in the deposit increased up to 45 wt.% whereas the grain size decreased. More uniform distribution of SiC particles in the deposit was also observed at higher cobalt concentrations. The microhardness of FG coatings increased from 250 to 450 HV from the interface to the outer surface. Functionally graded coating exhibited better wear resistance than uniform coatings.

نویسندگان

S.M. LARI BAGHAL

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.

A. AMADEH

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran

M. HEYDARZADEH SOH

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.