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Sintering and characterization of ZrN and (Dy,Zr)N as surrogate materials for fast reactor nitride fuel

高速炉用窒化物燃料を模擬したZrN及び(Dy,Zr)Nの焼結と性状分析

Pukari, M.*; 高野 公秀

Pukari, M.*; Takano, Masahide

不純物炭素及び酸素の起源と影響評価を目的として、不活性母材のZrNと窒化物燃料を模擬した(Dy,Zr)Nペレットを調製した。1.2wt%までの酸素を意図的に加え、焼結体密度を酸素濃度、焼結温度、粉末比表面積をパラメータとして調べた結果、ZrNに比べて(Dy,Zr)Nの方が酸素固溶による密度増大効果が大きいことを明らかにした。ZrNの組織には酸化物相析出が見られ、窒素雰囲気下では酸素固溶量が少ないことが示唆された。ペレット調製の各工程で酸素,窒素,炭素の分析を詳細に行うことで、工程毎の不純物濃度増大の程度を定量的に評価した。

Pellets of inert matrix material ZrN, and surrogate nitride fuel material (Dy$$_{0.4}$$Zr$$_{0.6}$$)N, are fabricated for the purpose of investigating the origin and the effect of carbon and oxygen impurity concentrations. Oxygen concentrations of up to 1.2 wt% are deliberately introduced into the materials with two separate methods. The achievable pellet densities of these materials, as a function of O content, sintering temperature and dimensional powder properties are determined. O dissolved into (Dy,Zr)N increases the achievable densities to a larger extent than if dissolved into ZrN. The segregation of O-rich phases in ZrN indicates a low O solubility in the material. Oxygen pick-up during the fabrication of the product as well as its exposure to air is demonstrated. The quality of the materials is monitored by the systematic analysis of O, N and C contents throughout the fabrication and sintering processes, supported by XRD and SEM analyses.

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パーセンタイル:30.92

分野:Materials Science, Multidisciplinary

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