Thermophysical properties of rock-like oxide fuel with spinel-yttria stabilized zirconia system

被引：45

作者：

Nitani, N ^{[1
]}

Yamashita, T

Matsuda, T

Kobayashi, S

Ohmichi, T

机构：

[1] Japan Atom Energy Res Inst, Tokai, Ibaraki 3191195, Japan

[2] Nucl Fuel Ind Ltd, Osaka 5900451, Japan

[3] Res Org Informat Sci & Technol, Tokai, Ibaraki 3191195, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 1999年 / 274卷 / 1-2期

关键词：

D O I：

10.1016/S0022-3115(99)00077-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermal expansion, thermal diffusivity, melting temperature, Vickers hardness and creep rate of the rock-like oxide (ROX) fuel were measured with the MgAl(2)O(4)(spinel)-ZrO(2)(Y,Gd) (YSZ: stabilized zirconia) system and the MgAl(2)O(4)-YSZ-UO(2) system in the temperature range between room temperature and 1800 K in order to evaluate thermophysical properties. Thermal expansion coefficients of MgAl(2)O(4)-YSZ composites increased with increasing YSZ content and the values were well represented by the Turner's equation. Addition of UO(2) to MgAl(2)O(4)-YSZ composite resulted in an increase of thermal expansion. Thermal conductivity values of the MgAl(2)O(4)-YSZ composites decreased with increasing YSZ content and agreed with predictions of the Maxwell-Eucken equation. The eutectic temperature of MgAl(2)O(4)-YSZ and MgAl(2)O(4)-YSZ-UO(2) systems was found to be 2200 K. High temperature hardness of the composites was higher than that of YSZ or MgAl(2)O(4). The hardness of ROX fuel was considerably higher than that of UO(2). The creep rate of MgAl(2)O(4)-YSZ composite was controlled by the lattice diffusion of YSZ. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：15 / 22

页数：8

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