000 02839cam a2200349 a 4500
003 EG-GiCUC
005 20250223032000.0
008 180426s2017 ua ho f m 000 0 eng d
040 _aEG-GiCUC
_beng
_cEG-GiCUC
041 0 _aeng
049 _aDeposite
097 _aPh.D
099 _aCai01.13.12.Ph.D.2017.La.O
100 0 _aLamiaa Zaky Mohamed Mostafa
245 1 0 _aOxidation properties of inhomogeneous pure Ni and its inhomogeneous binary alloys with Cr containing up to 12 wt%Cr in hot air at 1273K /
_cLamiaa Zaky Mohamed Mostafa ; Supervised Fawzi A. Elrefaie , Hafiz A. Ahmed , Omayma A. Elkady
246 1 5 _aخصائص تأكسد النيكل غير المتجانس وسبائكه الثنائية مع الكروم غير المتجانسة المحتوية على نسبة وزنية من الكروم تصل الى12%فى الهواء الساخن عند درجة حرارة 1273 كل{u٠٦ء٤}ن
260 _aCairo :
_bLamiaa Zaky Mohamed Mostafa ,
_c2017
300 _a121 P. :
_bfacsimiles , photographs ;
_c30cm
502 _aThesis (Ph.D.) - Cairo University - Faculty of Engineering - Department of Metallurgical Engineering
520 _aOxidation properties of inhomogeneous pure Ni and its inhomogeneous binary alloys with Cr containing up to 12 wt% Cr in hot air at 1273K are determined through this research. Seven pellets of inhomogeneous pure Ni and binary Ni-Cr alloys with chromium content which ranges from 0.25 to 12 wt%Cr are prepared using conventional powder metallurgy technique. The oxidation kinetics of inhomogeneous pellets of Ni and Ni-Cr alloys, and of inhomogeneous cast-Ni for a total oxidation time of 100 h has been investigated by gravimetric method. The growth rate of the oxide layers has not been found parabolic but starts with high rate and then it gradually decreases till reaching a constant growth rate (linear growth rate). Porous and duplex oxide layers are formed, which are not adherent with the metal substrate due to the cavities formed at the metal/oxide interface. In order to investigate the oxidation behavior in depth, X-ray diffractometry, optical microscopy, scanning electron microscopy and X-ray energy dispersive analysis are conducted. The main result of this research is that the linear growth rate of homogeneous nickel is estimated to be lower than that of inhomogeneous one by about one order of magnitude
530 _aIssued also as CD
653 4 _aHigh temperature oxidation
653 4 _aNi-Cr porous alloys
653 4 _aOxidation kinetics
700 0 _aFawzi Abdelkader Elrefaie ,
_eSupervisor
700 0 _aHafiz Abdelazim Ahmed ,
_eSupervisor
700 0 _aOmayma Abdelgawad Elkady ,
_eSupervisor
856 _uhttp://172.23.153.220/th.pdf
905 _aNazla
_eRevisor
905 _aSamia
_eCataloger
942 _2ddc
_cTH
999 _c65993
_d65993