Characterization of sintering of gelled UO3 microspheres |
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Authors: | A F Bishay A S Abdel-Halim F H Hammad M F Abadir A M Elaslaby |
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Institution: | (1) Metallurgy Department, Atomic Energy Authority, Egypt;(2) Faculty of Engineering, Cairo University, Cairo, Egypt |
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Abstract: | UO3 microspheres, prepared using an internal gelation process, were reduced and sintered. Hydrogen and argon atmospheres were used at temperatures ranging from 1100 °C to 1400 °C for different durations.It was found that the sintered density is higher for spheres réduced at 700 °C than at any other reduction temperature. Lower densities were achieved in argon atmosphere than in hydrogen for the same sintering and reduction temperature. More than 98% Th.D. could be obtained by calcining the UO3 spheres at 400 °C for 1 hr, reducing at 700 °C and then sintering at 1400 °C for 2 hrs in hydrogen atmosphere.
Zusammenfassung Über interne Gebildungsprozesse hergestellte UO3 Mikrokugeln wurden reduziert und gesintert. Dafür wurden Wasserstoff- und Argonatmösphären verschiedene Zeit lang bei Temperaturen zwischen 1100 °C und 1400 °C verwendet. Es wurde festgestellt, daß die Dichte des gesinterten Materials bei einer Reduktionstemperatur von 700 °C am größten ist. Bei gleichen Sinter- und Reduktionstemperaturen erreicht man in Argon eine geringere Dichte als in Wasserstoff. Mehr als 98% Th.D. kann man erreichen, indem man die UO3 Kugeln bei 400 °C eine Stunde lang kalziniert, bei 700 °C reduziert und dann zwei Stunden lang bei 1400 °C in Wasserstoffatmosphäre sintert.
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![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![mcy](/content/hw06824t22157v42/xxlarge1084.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![fcy](/content/hw06824t22157v42/xxlarge1092.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![gcy](/content/hw06824t22157v42/xxlarge1075.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![bcy](/content/hw06824t22157v42/xxlarge1073.gif) ![ycy](/content/hw06824t22157v42/xxlarge1099.gif) ![dcy](/content/hw06824t22157v42/xxlarge1076.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![gcy](/content/hw06824t22157v42/xxlarge1075.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![bcy](/content/hw06824t22157v42/xxlarge1073.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![zcy](/content/hw06824t22157v42/xxlarge1079.gif) ![kcy](/content/hw06824t22157v42/xxlarge1082.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![vcy](/content/hw06824t22157v42/xxlarge1074.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![kcy](/content/hw06824t22157v42/xxlarge1082.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![vcy](/content/hw06824t22157v42/xxlarge1074.gif) ![ycy](/content/hw06824t22157v42/xxlarge1099.gif) ![mcy](/content/hw06824t22157v42/xxlarge1084.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![mcy](/content/hw06824t22157v42/xxlarge1084.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![fcy](/content/hw06824t22157v42/xxlarge1092.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![vcy](/content/hw06824t22157v42/xxlarge1074.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![dcy](/content/hw06824t22157v42/xxlarge1076.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![dcy](/content/hw06824t22157v42/xxlarge1076.gif) . ![Bcy](/content/hw06824t22157v42/xxlarge1041.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![chcy](/content/hw06824t22157v42/xxlarge1095.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) 98% ![bcy](/content/hw06824t22157v42/xxlarge1073.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![yucy](/content/hw06824t22157v42/xxlarge1102.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![khcy](/content/hw06824t22157v42/xxlarge1093.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![khcy](/content/hw06824t22157v42/xxlarge1093.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![kcy](/content/hw06824t22157v42/xxlarge1082.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![bcy](/content/hw06824t22157v42/xxlarge1073.gif) ![ycy](/content/hw06824t22157v42/xxlarge1099.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![chcy](/content/hw06824t22157v42/xxlarge1095.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![bcy](/content/hw06824t22157v42/xxlarge1073.gif) ![zhcy](/content/hw06824t22157v42/xxlarge1078.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![gcy](/content/hw06824t22157v42/xxlarge1075.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![fcy](/content/hw06824t22157v42/xxlarge1092.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![chcy](/content/hw06824t22157v42/xxlarge1095.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![kcy](/content/hw06824t22157v42/xxlarge1082.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![khcy](/content/hw06824t22157v42/xxlarge1093.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![kcy](/content/hw06824t22157v42/xxlarge1082.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![mcy](/content/hw06824t22157v42/xxlarge1084.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) 400° ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![chcy](/content/hw06824t22157v42/xxlarge1095.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) 1 ![chcy](/content/hw06824t22157v42/xxlarge1095.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) , ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![dcy](/content/hw06824t22157v42/xxlarge1076.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![yucy](/content/hw06824t22157v42/xxlarge1102.gif) ![shchcy](/content/hw06824t22157v42/xxlarge1097.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![vcy](/content/hw06824t22157v42/xxlarge1074.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![vcy](/content/hw06824t22157v42/xxlarge1074.gif) ![lcy](/content/hw06824t22157v42/xxlarge1083.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) 700°, ![zcy](/content/hw06824t22157v42/xxlarge1079.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![kcy](/content/hw06824t22157v42/xxlarge1082.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) ![icy](/content/hw06824t22157v42/xxlarge1080.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![mcy](/content/hw06824t22157v42/xxlarge1084.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![vcy](/content/hw06824t22157v42/xxlarge1074.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![dcy](/content/hw06824t22157v42/xxlarge1076.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![dcy](/content/hw06824t22157v42/xxlarge1076.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![chcy](/content/hw06824t22157v42/xxlarge1095.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![ncy](/content/hw06824t22157v42/xxlarge1085.gif) 2 ![chcy](/content/hw06824t22157v42/xxlarge1095.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![scy](/content/hw06824t22157v42/xxlarge1089.gif) ![ocy](/content/hw06824t22157v42/xxlarge1086.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![mcy](/content/hw06824t22157v42/xxlarge1084.gif) ![pcy](/content/hw06824t22157v42/xxlarge1087.gif) ![iecy](/content/hw06824t22157v42/xxlarge1077.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) ![acy](/content/hw06824t22157v42/xxlarge1072.gif) ![tcy](/content/hw06824t22157v42/xxlarge1090.gif) ![ucy](/content/hw06824t22157v42/xxlarge1091.gif) ![rcy](/content/hw06824t22157v42/xxlarge1088.gif) 1400°.
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