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   Kinetic Study of Niobium Carbide Coating Formation on Aisi L2 Steel Using Thermo-Reactive Deposition Technique  
   
نویسنده Azizi M. ,Soltanieh M.
منبع International Journal Of Engineering - 2010 - دوره : 23 - شماره : 1 - صفحه:77 -85
چکیده    In the present study, thermo-reactive deposition method (trd) in a molten bath was used to form niobium carbide coating on aisi l2 steel. the coating was formed in five different composition of borax (na2b4o7), boric acid (b2o3), and ferro-niobium. for all of the five compositions of molten bath, niobium carbide coating treatment was carried out at 1173 k, 1273 k, and 1373 k for 2, 4 and 8 hours. the thickness of coating ranged between 3.6 ± 0.1 µm to 33.6 ± 0.5 µm depending on the bath composition, treatment time, and temperature. kinetic study of the formation of nbc coating demonstrated that for the molten baths containing 10 wt.% ferro-niobium or more, growth of the coating is under the controled of by diffusion. for such molten baths, the activation energy of the process was estimated to be 122.5 kj/mol. a practical formula to estimate the coating thickness in these molten baths has been suggested.
کلیدواژه Surfaces ,Niobium Carbide ,Thermo-Reactive Diffusion ,Kinetic
آدرس Iran University Of Science And Technology, Department Of Materials And Metallurgy Engineering, ایران, Iran University Of Science And Technology, Department Of Materials And Metallurgy Engineering, ایران
پست الکترونیکی mansour_soltanieh@iust.ac.ir
 
     
   
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