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首页> 外文会议>The 3rd International Symposium on Material Chemistry in Nuclear Environment (Material Chemistry '02 MC'02) Mar 13-15, 2002 Tsukuba >OBSERVATION OF INNER SURFACE OF FLAME-TOWER TYPE REACTOR FOR URANIUM CONVERSION
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OBSERVATION OF INNER SURFACE OF FLAME-TOWER TYPE REACTOR FOR URANIUM CONVERSION

机译：铀转化用火焰塔式反应器内表面的观察

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摘要

A fluorination reactor, which has been used to convert uranium tetrafluoride (UF_4) into uranium hexafluoride (UF_6), was completed after approximately 6000 hours operation at the uranium conversion facility in Japan. The observation of its inner surface was carried out to understand its corrosive condition and mechanism. The main wall of the reactor is made of Monel Alloy and its operational temperature is approximately 450℃ at external surface under gaseous fluorine atmosphere. A sampling was undertaken from the most corrosive part of the reactor wall, and its analysis was carried out to obtain the data for the condition of appearance, thickness, macro and micro structure, etc. The results of observation are as follows: (1) The thickness decreased evenly (average 3.9 mm/year); (2)The chemical composition of corrosive products as coating was mainly nickel fluoride (NiF_2), which suggested that the corrosion mechanism could have been caused by the high temperature gas corrosion; (3)The total amount of coating was lower than that of a loss in thickness. For some reason, some of coating would seem to become extinct on the surface of the wall. The deterioration of coating, which formed a protector on the wall due to excess heating of the wall, the sand erosion effect by UF_4, etc. have contributed to this state of condition.
机译：在日本的铀转化工厂运行约6000小时后，已经完成了一个氟化反应器，该反应器已用于将四氟化铀（UF_4）转化为六氟化铀（UF_6）。对其内表面进行观察以了解其腐蚀状况和机理。反应器的主壁由蒙乃尔合金制成，在气态氟气氛下其外表面的工作温度约为450℃。从反应堆壁最腐蚀的部分取样，并进行分析以获得外观，厚度，宏观和微观结构等条件的数据。观察结果如下：（1）厚度均匀减少（平均3.9毫米/年）； （2）腐蚀产物的化学成分主要为氟化镍（NiF_2），表明其腐蚀机理可能是由高温气体腐蚀引起的。 （3）涂层的总量低于厚度损失。由于某些原因，某些涂层似乎在壁的表面上已经消失了。由于壁的过度加热，UF_4引起的沙蚀作用等，在壁上形成保护层的涂层的劣化促成了这种状态。

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