Classification and quantification of initial porosity in a CMC laminate
Classification and quantification of initial porosity in a CMC laminate
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DOI：
10.1016/j.compositesa.2003.09.026
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发表时间：
2004-02
影响因子：
8.7
通讯作者：
P. Puglia;M. Sheikh;D. Hayhurst
中科院分区：
文献类型：
--
作者：
P. Puglia;M. Sheikh;D. Hayhurst
本文研究了 10 层层压陶瓷基复合材料 DLR-XT 的初始或制造孔隙率的分类和量化。光学和扫描电子显微镜 (SEM) 技术都用于识别不同类别的孔隙度并测量和量化其范围。已确定四类孔隙率，即纤维间微孔隙率；跨丝束裂纹；基体裂纹；和裸露的基质区域。这些类型的孔隙率中的每一种的存在都已通过光学和扫描电镜检查得到证实。为了量化孔隙度，使用了两种方法。对于类空隙孔隙率的情况，使用面积分数；对于类裂纹孔隙度，测量了裂纹的周期性及其长度。本文最后列出了观察到的孔隙类型及其水平。没有对这些量级的重要性进行解释，因为这将在随后对它们对热性能和机械性能的影响的背景下进行。这将构成后续一系列论文的主题。
This paper examines the classification and quantification of initial or manufacturing porosity of a 10 layer laminate ceramic matrix composite DLR-XT. Both optical and scanning electron microscopy (SEM) techniques are used to identify different classes of porosity and to measure and quantify their extent. Four classes of porosity have been identified, namely inter-fibre micro-porosity; trans-tow cracks; matrix cracks; and denuded matrix regions. The presence of each of these types of porosity has been confirmed by both optical and SEM examination. In order to quantify the degree of porosity, two approaches have been used. For the case of void-like porosity, area fraction has been used; and, for crack-like porosity, the periodicity of the cracks and their lengths has been measured. The paper concludes by tabulating porosity types and their levels observed. No interpretation is made of the significance of these magnitudes since this will be subsequently carried out in the context of their influence on thermal and mechanical properties. This will form the subject of a series of subsequent papers.