Characterization of eutectic reaction of Cr and Cr/CrN coated zircaloy accident tolerant fuel cladding
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Eutectic reactions of five kinds of Cr-coated Zr alloy cladding with different base materials (ZreNbeSn alloy or ZreNb alloy), different coating thicknesses (6~22.5 mm), and different coating materials (Cr single layer or Cr/CrN bilayer) were studied using Differential Scanning Calorimetry (DSC). The DSC experiments demonstrated that the onset temperatures of the Cr single layer coated specimens were almost identical to ~1308 C, regardless of base materials or coating thicknesses. This study demonstrated that the Cr/CrN bilayer coated ZreNbeSn alloy has a slightly (~10 C) higher eutectic onset temperature compared to the single Cr-coated specimen. The eutectic region characterized by post-eutectic microstructure proportionally increases with coating thickness. The post-eutectic characterization with different holding times at high temperature (1310e1330 C) reveals that progression of ZreCr eutectic requires time, and it dramatically changed with exposure time and temperature. The practical value of the time gain in non-instantaneous eutectic formation in terms of safety margin, however, seems to be limited.
Abstract
Eutectic reactions of five kinds of Cr-coated Zr alloy cladding with different base materials (ZreNbeSn alloy or ZreNb alloy), different coating thicknesses (6~22.5 mm), and different coating materials (Cr single layer or Cr/CrN bilayer) were studied using Differential Scanning Calorimetry (DSC). The DSC experiments demonstrated that the onset temperatures of the Cr single layer coated specimens were almost identical to ~1308 C, regardless of base materials or coating thicknesses. This study demonstrated that the Cr/CrN bilayer coated ZreNbeSn alloy has a slightly (~10 C) higher eutectic onset temperature compared to the single Cr-coated specimen. The eutectic region characterized by post-eutectic microstructure proportionally increases with coating thickness. The post-eutectic characterization with different holding times at high temperature (1310e1330 C) reveals that progression of ZreCr eutectic requires time, and it dramatically changed with exposure time and temperature. The practical value of the time gain in non-instantaneous eutectic formation in terms of safety margin, however, seems to be limited.
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