اثر افزودنی تف‌جوشی بر رشد دانه در قرص سوخت هسته‌ای UO2

نوع مقاله: مقاله پژوهشی

نویسندگان

1 پژوهشکده‌ی مواد و سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران

2 پژوهشکده‌ی مواد، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران

چکیده

در این کار اثر افزودنی‎های مختلف روی رشد دانه و چگالش قرص UO2 با شروع از پودر با مشخصات شیمیایی و فیزیکی معین مورد مطالعه و بررسی قرار گرفت. مخلوط پودر و افزودنی‎ها متراکم پرس و تحت اتمسفر هیدروژن در مدت 6 ساعت و در دمای 1700 ˚C‌ تف‌جوشی شد. افزودنی Cr2O3 نه تنها میزان چگالش قرص را افزایش ‎داد بلکه اندازه‌ی دانه را نیز به ‌شدت افزایش ‎داد. در صورتی‌که افزودنی‎های دیگر تأثیر خیلی کمی در افزایش اندازه دانه‌ی قرص سوخت هسته‎ای داشتند. رفتار تف‌جوشی و تشکیل ریزساختار درشت- دانه برحسب کاهش کروم اکسید به کروم فلزی، انحلال Cr2O3 در UO2 و تف‌جوشی توصیف شده است.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Sintering Additive on Grain Growth in UO2 Nuclear Fuel Pellet

نویسندگان [English]

  • R. A Rahimi 1
  • M Iravani 2
  • M Mohammadifar 2
1 Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI
2 Materials Research School, Nuclear Science and Technology Research Institute, AEOI
چکیده [English]

In this work, a powder with specific chemical and physical characteristics was used and the effect of different additives on grain growth and densification of UO2 pellets were studied. The mixture of powder and additives was pressed and then sintered under hydrogen atmosphere for 6 hours at 1700֩C. The Cr2O3 additive not only increased densification but also severely increased the grain size. Other additives had little effect on grain growth of the nuclear fuel pellets. Sintering behavior and Coarse-grained microstructure formation are discussed in terms of the reduction of Cr2O3 to Cr, the dissolution of Cr2O3 in UO2 and sintering.
 

کلیدواژه‌ها [English]

  • UO2 Nuclear Fuel Pellets
  • Grain Growth
  • Additives
  • Sintering

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