471. Dy₂O₃分散W, ZrO₂およびUO₂の高温挙動

抄録

Dispersions of Dy₂O₃ in W, ZrO₂ (CaO stabilized) and UO₂ were subjected to steep temperature gradient at near melting temperature of the respective matrixes, to determine the compatibility of Dy₂O₃ with W, ZrO₂ and UO₂.
The main results obtained are as follows:
(1) Dy₂O₃ is compatible with W up to 2, 300°C. Physically however the Dy₂O₃ was found to migrate and agglomerate in the central region, and become one sintered block.
(2) In the case of Dy₂O₃-ZrO₂, the Dy₂O₃ particles were no longer visible in the central region where the temperature was above 1, 900°C: they had formed a solid solution with ZrO₂.
(3) X-ray diffraction analysis applied ro the massive grain region of Dy₂O₃UO₂, where temperature was above 1, 900°C, revealed that Dy₂O₃ had formed a solid solution with UO₂.