X-CT无损测试技术用于陶瓷涂层三维重构和孔隙率计算  

Three-dimensional Reconstruction and Porosity Calculation of Ceramic Coating:Nondestructive X-ray Computed Tomography

作　　者：张志锋 王凤娟[1] 武胜萍[1] 蒋金洋[1] ZHANG Zhifeng;WANG Fengjuan;WU Shengping;JIANG Jinyang(Jiangsu Key Laboratory for Construction Materials,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学江苏省建筑材料重点实验室,南京211189

出　　处：《无机材料学报》2020年第9期1059-1063,共5页Journal of Inorganic Materials

基　　金：National Basic Research Program of China(973 Program,2015CB65510)。

摘　　要：陶瓷涂层对海工环境中的钢筋有着较好的保护作用。在碳钢表面喷涂磷酸盐陶瓷涂层,采用XRD和XRF对陶瓷涂层的物相组成进行分析。结果表明:实验用陶瓷的主要晶相成分为P2O5与SiO2。采用SEM对陶瓷的表面和截面形貌进行观察,发现陶瓷涂层内存在微裂纹,涂层的厚度约为349μm。采用X-CT测试可以得到陶瓷内部结构的高清图像,并利用Matlab和Mimics软件对高清图像进行三维重构。此外通过阈值分割技术,将CT图像内的孔与基体灰度值区分开来,并计算得到陶瓷涂层的孔隙率为14%,并采用压汞测试技术对测试结果进行验证。研究认为X-CT无损测试是一种建立陶瓷涂层内可视化孔结构分析的有效工具。Ceramic coatings can effectively prevent the corrosion of steel bars in marine environments.In this study,we prepared phosphate ceramic coatings on the surface of carbon steel.X-ray diffraction and X-ray fluorescence were used to analyze the phase structure and composition of the ceramic and the results show that the main crystal composition of ceramic is P2O5 and SiO2.Scanning electron microscopy was used to characterize the morphology of the surface and the section and results showed that the surface was cracked,and the thickness of ceramic was 349μm.Meanwhile,a number of high-resolution images of internal structure of solids were obtained by non-destructive X-ray computed tomography(X-CT).Matlab and Mimics software were used to conduct the three-dimensional reconstruction of the CT images.Matrix and holes are distinguished by threshold segmentation in grayscale images,and the porosity of the ceramic coatings was calculated to be 14.0%.In addition,mercury intrusion porosimetry was used to verify the calculation results.Therefore,X-CT can be a useful and reliable tool for the visualization of the internal structure of ceramic coatings.

关 键 词：陶瓷 孔隙率 X-CT技术 三维重构 

分 类 号：TQ174[化学工程—陶瓷工业]