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首页> 外文会议>International Conference on Advanced Ceramics and Composites >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：三型涂层燃料颗粒中SiC层的断裂性能

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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：研究了涂覆的SiC层的裂缝性能及其与微观结构和加工条件的关系。基于有限元（Fe）分析对应力分布的有限元（Fe）分析的结果进行了一种挤压试验方法，并应用于用于Tri-各向同性（Triso）燃料的化学气相沉积（CVD）SiC层的裂缝强度评估粒子。在压碎试验中使用橡皮布材料，因为Fe分析证实，在样本的凸起表面和柱塞尖端之间插入的相对柔软的金属（黄铜箔）在接触面积下产生高度均匀的应力。从不同版本的涂覆燃料颗粒制备九套半球壳样本，包括若干相关的涂层燃料颗粒：AGR（先进的气体冷却反应器）燃料，德国参考燃料和其他开发燃料在橡木岭国家提供实验室。涂层显示晶粒尺寸和密度的变化，该粒度源于涂覆过程中的不同条件。在室温下测试至少30个样本，并使用Weibull统计分析裂缝应力数据。计算的局部断裂应力转化为每个颗粒的整个内表面积的断裂应力。然而，在330-650MPa的范围内，用测试材料变化的平均断裂应力，但不能明确地连接到微观结构特征。

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