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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 1405-1412 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 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.
    Abstract: Резюме Микросферическая тр ехокись урана, получе нная методом внутреннего желатирования, была подвергнута вос становлению и спекан ию. Процессы проводились с различ ной продолжительностью в интервале температ ур 1100–1400° в атмосфере водорода и аргона. Найдено, чти плотност ь спекания была более высокой для сферических частиц т рехокиси урана, подвергнутых восста новлению при 700°, чем пр и других температурах восста новления. При той же самой температуре спекания и восстанов ления в атмосфере аргона был и достигнуты более низкие плотности по с равнению с таковыми в атмосфере водорода. Более чем 98% а бсолютно сухой трехокиси уран а было получено путем обжига сферической трехоки си урана при температуре 400° в течен ии 1 часа, с последующим восстановлением ее п ри 700°, а затем спеканием ее в атмосф ере водорода в течени и 2 часов при температуре 1400°.
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 587-594 
    ISSN: 1572-8943
    Keywords: catalytic activity ; Cr-Mo-O system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The phase diagram of the ternary system Cr-Mo-O in air was established from the results of thermal analysis of mixtures with different initial CrO3 to MoO3 ratios. It was found that MoO3 did not take any chromium oxide into solid solution. The presence of Cr2O3 destabilized MoO3 causing it to decompose to MoO2 in the temperature range 723-958 K depending on the initial Cr/Mo ratio. The decomposition of pure MoO3 MoO2 did not occur in air at any temperature. However, this decomposition took place through the formation of the compound Cr2O3·3MoO3(ss) and its decomposition to Cr2O3·3MoO2(ss). The latter compound has never been reported before and the X-ray data for this compound are given. The previously reported catalytic activity of Cr2O3·3MoO3(ss), at high temperatures, is presumably due to its reduction to Cr2O3·3MoO2(ss).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 32 (1987), S. 1877-1881 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kinetik der Zersetzung von Gel UO3 Mikrokügelchen wurde mittels Thermoanalyse (DTA und TG) und Röntgenstrukturanalyse untersucht. Die in dieser Abhandlung benutzten UO3 Mikrokügelchen wurden unter Zuhilfenahme von Hydrolyseprozessen hergestellt. Die DTA- und TG-Kurven wurden in verschiedenen Atmosphären und bei verschiedenen Aufheizgeschwindikeiten aufgenommen. Mit der Methode von Carrol und Manche wurden die Aktivierungsenergien für die einzelnen Schritte der Zersetzung berechnet.
    Abstract: Резюме Методом ДТА, ТГ и рентг еноструктурного анализа изучена кине тика разложения микросферического г елеобразного UO3, получ енного путем гидролиза. Крив ые ДТА и ТГ были измерены в различной атмосфере и при разли чных скоростях нагрева. Эн ергии активации различных стадий раз ложения были вычисле ны по методу Кэррола и Мэнча.
    Notes: Abstract The kinetics of decomposition of gelled UO3 microspheres has been studied by thermal analysis (DTA and TG) and by X-ray examination. UO3 microspheres prepared via a hydrolysis process were used in the study. The DTA and TG curves were obtained in various atmospheres at different heating rates. The activation energies for the various stages of decomposition were calculated using the Carrol and Manche method.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 50-55 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Intermediate phases and reactions occurring on decomposing diammonium hydrogen phosphate, ammonium para molybdate, sodium tungstate dihydrate and ammonium meta vanadate were established by thermal analysis and X-ray examination.These salts promote fabric degradation at low temperatures but are effective at high temperatures. Diammonium hydrogen phosphate produced maximum amount of gases, absorbed the highest amount of heat and gave the highest fire retardation above 350°C.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 1984-01-01
    Print ISSN: 0001-1541
    Electronic ISSN: 1547-5905
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley on behalf of American Institute of Chemical Engineers.
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