NMR imaging of slipcast SiC whisker-reinforced alumina
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Application of nuclear magnetic resonance (NMR) imaging, with analysis of grey levels in the images, provides a semi-quantitative non-destructive estimation of the extent of whisker distribution in the green state composites. Regions with large physical flaws caused by hard particles or open pores may be identified. Examination of the composite after sintering, by scanning electron microscopy (SEM) and energy dispersive analysis of X-rays, confirmed that the areas of high grey levels in the NMR images were mainly caused by whisker bundles. However, individual flaws smaller than the detection limit (100 μm) of the NMR imaging technique were also observed during the SEM analysis of the sintered sample.
KeywordsScanning Electron Microscopy Nuclear Magnetic Resonance Detection Limit Imaging Technique Grey Level
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