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首页> 美国政府科技报告 >Comparison of X-Ray Computed Tomography, Through-Transmission Ultrasound, and Low-KV X-Ray Imaging for Characterizing Green-State Ceramics
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Comparison of X-Ray Computed Tomography, Through-Transmission Ultrasound, and Low-KV X-Ray Imaging for Characterizing Green-State Ceramics

机译：用于表征绿态陶瓷的X射线计算机断层扫描，透射超声和低KV X射线成像的比较

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Green-state MgAl sub 2 O sub 4 compact disk specimens have been studied by x-ray computed tomography (CT), through-transmission pulsed ultrasound, and low-kV x-ray imaging to compare the abilities of these nondestructive evaluation (NDE) methods to detect flaws and density variations. X-ray computed tomographic images were obtained from a 125-kV (peak) imaging system with a 512 x 512 matrix and a pixel size of 100 mu m. A 3- to 10- MHz focused-beam ultrasonic transducer was used, together with special immersion techniques, to obtain topographical maps of acoustic attenuation and phase velocity; a 30 x 30 matrix was used in the ultrasonic scans. A 35-kV x-ray system with high-resolution type RR film was used to obtain conventional radiographs. Large-scale nonuniform density gradients were detected with CT and ultrasonics in supposedly uniform ceramic disks. In addition, inclusions in the green-state samples were detected by all three methods, with each method providing certain advantages. The influence of grain structure and other ceramic powder characteristics will be examined in the future. 5 refs., 9 figs. (ERA citation 10:051902)

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