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

Nitani, Noriko; Yamashita, Toshiyuki; Matsuda, Tsuneo; Kobayashi, Shozo; Ohmichi, Toshihiko

doi:10.1016/s0022-3115(99)00077-x

Cited by 46 publications

(24 citation statements)

References 7 publications

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“…Generally, thermal conductivity is determined by lattice vibration in insulators. Debye [20] proposed that the thermal conductivity of insulator l can be described as the following equation using the kinetic theory of gases: [11,13] l 5 1 3 C n nl [3] where C v is the heat capacity at constant volume in J/Km 3 , v the velocity of sound, and l the phonon mean free path. Equation [3] can be combined with Eq.…”

Section: Discussionmentioning

confidence: 99%

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Thermal diffusivity/conductivity of MgAlON-BN composites

Zhang

Seetharaman

2006

Metall Mater Trans B

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Thermal diffusivity and heat capacity of MgAlON and MgAlON-BN composites were measured in the temperature range of 25°C to 1300°C using a laser flash technique and a differential scanning calorimeter (DSC) technique, respectively. Based on these measurements, effective thermal conductivity of the composites was calculated using the values measured earlier in the same substance. The experimental effective thermal conductivity results of the composites containing different BN contents were found to show the similar trend, which decreased rapidly with increasing temperature below 900°C followed by a slow decrease with further increasing temperature. This can be explained by the fact that thermal conduction in both components, MgAlON and BN, was dominated by phonons. The phonon mean free path decreased with increasing temperature, limited by the characteristic length between two neighboring atoms. The BN addition has significant influence on the effective thermal conductivity. The effective thermal conductivity of the composites containing BN exhibited a small degree of anisotropy with respect to preferred orientation of the BN phase. The degree of anisotropy of the composites increased with increasing BN content, which is particularly pronounced at the higher BN additions. An equation suitable for the present composites has been derived based on Luo's model. The model was slightly modified in the present article. The predicted values calculated by the model were in good agreement with experimental results.

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Section: Discussionmentioning

confidence: 99%

“…[17][18][19][20][21][22] In most of these investigations, the inclusions in particulate composites were generally considered as being spherical. [22] Eucken [18,29] gave one equation to describe how a minor amount of a discontinuous second phase disperses uniformly in a continuous major phase.…”

Section: B Effect Of Bn On the Effective Thermal Conductivitymentioning

confidence: 99%

Thermal diffusivity/conductivity of MgAlON-BN composites

Zhang

Seetharaman

2006

Metall Mater Trans B

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“…Various oxides, carbides, and nitrides have been studied as candidates to form either a homogeneous solid solution or a heterogeneous two-phase microstructure with the fuel [3][4][5][6][7]. The utilization of plutonium as mixed oxide fuel (MOX: PuO 2 + UO 2 ) is the current most practical solution for this issue since the technology for the commercial utilization of the UO 2 fuel has already been established.…”

Section: Introductionmentioning

confidence: 99%

Phase relation assessment for O–Pu–U ternary system

Yamanaka

Kinoshita

Kurosaki

2004

Journal of Nuclear Materials

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“…Knowledge in the phase equilibrium of these oxides with the ZrO 2 is of great importance for the nuclear fuels [2] and plutonium disposition [1,3], which involve such solid solutions as ZrO 2 -UO 2 [2], ZrO 2 -PuO 2 [3][4][5][6], ZrO 2 -ThO 2 -PuO 2 [1] and ZrO 2 -ThO 2 -CeO 2 [1].…”

Section: Introductionmentioning

confidence: 99%