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Design of a uranium-dioxide powder spheroidization system by plasma processing.

机译:通过等离子处理设计的二氧化铀粉末球化系统。

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摘要

The plasma spheroidization system (PSS) is the first process in the development of a tungsten-uranium dioxide (W-UO2) ceramic-metallic (cermet) fuel for nuclear thermal rocket (NTR) propulsion. For the purposes of fissile fuel retention, UO2 spheroids ranging in size from 50 - 100 micrometers (μm) in diameter will be encapsulated in a tungsten shell. The PSS produces spherical particles by melting angular stock particles in an argon-hydrogen plasma jet where they become spherical due to surface tension. Surrogate CeO 2 powder was used in place of UO2 for system and process parameter development. Stock and spheroidized powders were micrographed using optical and scanning electron microscopy and evaluated by statistical methods to characterize and compare the spherocity of pre and post process powders. Particle spherocity was determined by irregularity parameter. Processed powders showed a statistically significant improvement in spherocity, with greater that 60% of the examined particles having an irregularity parameter of equal to or lower than 1.2, compared to stock powder.
机译:等离子体球化系统(PSS)是开发用于核热火箭(NTR)推进的二氧化钨(W-UO2)陶瓷金属(金属陶瓷)燃料的第一个过程。为了保持裂变燃料,将直径范围为50-100微米(μm)的UO2椭球体封装在钨壳中。 PSS通过在氩气-氢等离子体射流中熔化角料颗粒而产生球形颗粒,这些颗粒由于表面张力而变成球形。用替代CeO 2粉末代替UO2进行系统和工艺参数开发。使用光学和扫描电子显微镜对原粉和球化粉进行显微照相,并通过统计方法进行评估,以表征和比较加工前和加工后粉末的球度。颗粒的球形度由不规则性参数确定。与原料粉末相比,加工后的粉末在球度上具有统计学上的显着改善,超过60%的被检查颗粒的不规则性参数等于或小于1.2。

著录项

  • 作者

    Cavender, Daniel.;

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Engineering Aerospace.;Engineering Materials Science.;Engineering Nuclear.
  • 学位 M.S.E.
  • 年度 2013
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TS97-4;
  • 关键词

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