SEM analysis of the microstructure of the layers in triple‐coated isotropic (TRISO) particles
SEM analysis of the microstructure of the layers in triple‐coated isotropic (TRISO) particles
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DOI：
10.1002/sia.3266
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发表时间：
2010-06
影响因子：
1.7
通讯作者：
N. G. van der Berg;J. Malherbe;A. Botha;E. Friedland
中科院分区：
文献类型：
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作者：
N. G. van der Berg;J. Malherbe;A. Botha;E. Friedland
球床模块化反应堆（PBMR）是核反应堆中一种新的固有安全设计。在这种高温反应堆中，燃料是多层小球的形式，称为三层各向同性（TRISO）颗粒。这些涂层粒子由四层围绕的UO2内核组成，这些层都是化学气相沉积（CVD）沉积的。这些层是紧挨着内核的缓冲石墨层，接着是内部热解碳层（IPyC）、SiC层，最后是外部热解碳层（OPyC）。本研究的重点是颗粒的微观结构，特别是与它们的功能。由于涂层颗粒在非常恶劣的环境中工作（例如，高温和重复快速冷却和加热时间，高通量中子照射，放射性裂变产物的容纳），因此层的微观结构和组成对于保持颗粒的完整性非常重要。在本研究中，通过高分辨率SEM研究了不同涂层的微观结构。版权所有© 2010约翰威利父子有限公司.
One of the new inherently safe designs in nuclear reactors is the pebble bed modular reactor (PBMR). In this high temperature reactor the fuel is in the form of small multilayered spheres called triple‐coated isotropic (TRISO) particles. These coated particles consist of a UO2 kernel surrounded by four layers, which are all chemical vapour deposition (CVD) deposited. The layers are a buffer graphite layer next to the kernel followed by an inner pyrolytic carbon layer (IPyC), a SiC layer and finally an outer pyrolytic carbon layer (OPyC). This investigation focuses on the microstructure of the particles specifically in relation to their functions. Because the coated particles operate in a very harsh environment (e.g. high temperatures with repeated rapid cooling and heating‐up times, high flux neutron irradiation, containment of the radioactive fission products) the microstructure and composition of the layers are extremely important to preserve the integrity of the particles. In this investigation the microstructures of the different coated layers are investigated by high‐resolution SEM. Copyright © 2010 John Wiley & Sons, Ltd.