Laser melting of uranium carbides
Laser melting of uranium carbides
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DOI：
10.1016/j.jnucmat.2008.12.031
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发表时间：
2009-03-31
影响因子：
3.1
通讯作者：
Manara, D.
中科院分区：
文献类型：
--
作者：
Utton, C. A.;De Bruycker, F.;Manara, D.
在旨在支持第四代核电厂发展的材料研究背景下，最近对碳化物燃料产生了新的兴趣。深入了解核材料在极端条件下的行为，对于分析核燃料的运行极限和预测可能发生的核反应堆事故至关重要。在这种情况下，本文的主要目标是证明激光诱导熔化实验的化学计量的碳化铀的可行性; UC，UC1.5和UC 2。在大约3000 K的温度下，在几巴惰性气体下进行测量，以使在这些温度下可能发生的蒸发和氧化效应最小化。此外，最近开发的调查方法已被采用，在熔融过程中的样品表面反射率的演变的原位分析的基础上。目前的结果，2781 K的熔点的UC，2665 K的固相线和2681 K的液相线的U2 C3，2754 K的固相线和2770 K的液相线的UC 2，是在公平的协议与早期出版物，其中的熔化行为的碳化铀的研究，通过传统的炉熔化方法。在当前的研究中已经获得了关于某些碳化物的非全等（固-液相线）熔化的进一步信息，这表明固-液相线方案之后是更高比例的碳化物，甚至可能是UC 2。(c)2009爱思唯尔有限公司版权所有。
In the context of the material research aimed at supporting the development of nuclear plants of the fourth Generation, renewed interest has recently arisen in carbide fuels. A profound understanding of the behaviour of nuclear materials in extreme conditions is of prime importance for the analysis of the operation limits of nuclear fuels, and prediction of possible nuclear reactor accidents. In this context, the main goal of the present paper is to demonstrate the feasibility of laser induced melting experiments on stoichiometric uranium carbides; UC, UC1.5 and UC2. Measurements were performed, at temperatures around 3000 K, under a few bars of inert gas in order to minimise vaporisation and oxidation effects, which may occur at these temperatures. Moreover, a recently developed investigation method has been employed, based on in situ analysis of the sample surface reflectivity evolution during melting. Current results, 2781 K for the melting point of UC, 2665 K for the solidus and 2681 K for the liquidus of U2C3, 2754 K for the solidus and 2770 K for the liquidus of UC2, are in fair agreement with early publications where the melting behaviour of uranium carbides was investigated by traditional furnace melting methods. Further information has been obtained in the current research about the non-congruent (solidus-liquidus) melting of certain carbides, which suggest that a solidus-liquidus scheme is followed by higher ratio carbides, possibly even for UC2. (c) 2009 Elsevier B.V. All rights reserved.