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首页> 外文期刊>Ceramic Engineering and Science Proceedings >FRACTURE PROPERTIES OF SiC LAYER IN TRISO-COATED FUEL PARTICLES
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FRACTURE PROPERTIES OF SiC LAYER IN TRISO-COATED FUEL PARTICLES

机译：等渗涂层燃料颗粒中SiC层的断裂性能

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摘要

The fracture properties of coated SiC layers and their relationship with microstructure and processing condition have been investigated. A crush testing method for hemispherical shell specimens was developed based on the results of finite element (FE) analysis on stress distribution and applied to the evaluation of fracture strength for the chemical vapor deposited (CVD) SiC layers of tri-isotropic (TRISO) fuel particles. A blanket material was used in the crush tests as the FE analysis confirmed that a relatively soft metal (brass foil) inserted between the specimen's convex surface and plunger tip produced a highly uniform stress under the contact area. Nine sets of hemispherical shell specimens were prepared from different versions of coated fuel particles, which include several relevant lots of coated fuel particles: AGR (advanced gas-cooled reactor) fuels, a German reference fuel, and other development fuels available at Oak Ridge National Laboratory. The coatings display variations in grain size and density, which originated from different conditions in coating processes. At least 30 specimens were tested at room temperature for each material and the fracture stress data were analyzed using Weibull statistics. The local fracture stress calculated was converted to the fracture stress for the whole inner surface area of each particle. Mean fracture stress varied with test material in the range of 330 - 650 MPa, however, could not be clearly connected to the microstructural characteristics.
机译：研究了涂层SiC层的断裂性能及其与显微组织和加工条件的关系。基于有限元分析应力分布的结果，开发了一种半球形壳试样的压溃测试方法，并将其用于评估三向同性（TRISO）燃料的化学气相沉积（CVD）SiC层的断裂强度粒子。在有限元分析中，橡皮布材料被用于压碎测试，因为有限元分析证实插入样品的凸面和柱塞头之间的相对较软的金属（黄铜箔）在接触区域产生了高度均匀的应力。从不同版本的涂层燃料颗粒制备了九套半球形壳标本，其中包括几种相关批次的涂层燃料颗粒：AGR（先进气冷堆）燃料，德国参考燃料以及Oak Ridge National可获得的其他开发燃料实验室。涂层显示出晶粒尺寸和密度的变化，这是由涂层工艺中的不同条件引起的。每种材料在室温下至少测试30个样品，并使用Weibull统计数据分析断裂应力数据。将计算出的局部断裂应力转换为每个颗粒的整个内表面积的断裂应力。在330-650 MPa范围内，平均断裂应力随测试材料的不同而变化，但是不能清楚地与显微组织特征联系起来。

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