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首页> 外文期刊>Materials Science Research International >Characterization of integrated data on inherent flaws in engineering ceramics
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Characterization of integrated data on inherent flaws in engineering ceramics

机译：工程陶瓷固有缺陷的综合数据表征

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Integrated data on inherent flaws in engineering ceramics were characterized for quantitative analyses of them. For this purpose, a ceramic strength database utilized on a personal computer was temporarily constructed so that collected data on flaws could be compiled as records in the database. It was clarified that distributions of the equivalent crack length l for several ceramics were nearly fitted to normal distribution functions. The distribution of l was investigated for every type of flaw, and it was found to shift toward a longer length region in the order of embedded, surface, and corner flaws. The flaw data were also correlated with strength and microstructural parameters. In the relation to the strength, the strength was reduced as a whole with the decrease in the crack length, while the lower bound of strength scatter was predicted by a modified relation of the fracture mechanics criterion for long cracks. It was revealed that the flaw size increased with the increase in the grain size or the porosity. The relation of a Petch-Hall type was observed between the grain size and the mean strength estimated by using the mean value of l. Some useful suggestions were offered for the improvement of ceramic strength.
机译：对工程陶瓷固有缺陷的综合数据进行了表征，以对其进行定量分析。为此，临时构建了在个人计算机上使用的陶瓷强度数据库，以便可以将收集的有关缺陷的数据编译为数据库中的记录。可以澄清的是，几种陶瓷的等效裂纹长度l的分布几乎符合正态分布函数。研究了每种缺陷类型的l分布，发现它朝着较长的长度区域移动，顺序是嵌入缺陷，表面缺陷和拐角缺陷。缺陷数据还与强度和微结构参数相关。关于强度，强度随着裂纹长度的减小而整体降低，而强度散布的下限则通过长裂纹的断裂力学准则的修正关系来预测。结果表明，缺陷尺寸随着晶粒尺寸或孔隙率的增加而增加。观察到Petch-Hall类型的关系，在晶粒尺寸和通过使用l的平均值估计的平均强度之间。为提高陶瓷强度提供了一些有用的建议。

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