| Coiiputed tomography is able to display the structure，coiipositioii, texture anddefect condition inside the detected object clearly, accurately and intuitively in the ofrmof two-dimensional tomographic images or three-dimeiisbnal images, oil condition thatthere are110damages in the detected object. By using X-ray source of micro-ofcus or11a110-ofcus can achieve a resolution of micron-scale or sub-microu ofr imagingdetection of liigh-precisiorL and subtle defects. As the caiboii/carbon conposite materialhas unique lacunose structure clmacteristics, while the micro-CT can provide detailed3D details, it can be used ofr high-re solution three-dimensional structure analysis ofconposite mateirals，which is miinatched by other technologies.(1)High-resohitioii micro-CT images are obtained by doing micor-CTe^eriiiieiital research on tlii’ee-dmieiisioiial acupuncture carbon/carbon composites.Intent1micros tincture of the specimen were observed and analyzed in three directionsof x-axis-，y-axis and zaxis of CT images, to distinguish the micro-structure such aspores，layering, ifber bundle breaking, cracks and high-density inclusions of the interiorof the sample rfom the CT images. The results1b ve shown that: ifx)in the tomographicimages, cracks mainly extend along the fiber direction^volume porosity of sampleobtained by statistics is about5,7%. pores, cracks and inclusions of the interior of thematerial are extracted and done three-dimensional visualization by doingthree-dimensioiial reconstruction for the inicro-CT results of tlnee-diinensioiial needlecarboii/carbon conposite.(2)High-resolution micro-CT images are obtained by doing the e>periinentalmicro-CT research on textile carboii/carbon composites. Locally layering and poredistribution of the interior of the sample are observed by analyzing the arrange me nt andweave of the ifber if’om CT reconstructed images in different coordinate axis directionsThe results have shown tliat; from tomographic iinage in the three directions, it isobserved that textile composite material has a typical distribution of otrhogonal weave,volume porosity of the sample is about14%by statistics, the woven ifber structme ofthe saiiple is reflected directly rfom the three-dimensional reconstructed model bydoing tliiee-dimensional reconstruction oil the experimental results of micro-CT，thelack of beam on the surface of saiiple is observed, the pores of sanple are extracted anddone visualization on its three-dimensional distribution^extraction and separation methods of ifber of different directions of textile composites are discussed, itsuccessfully distinguishes the ifbers of z-axis rfom the fibers of y axis, and dotliree-dimensional visualization on the ifber bundle in both directions,(3) High-resolution CT images of nano-ofcus are obtained by doing nriio-focus CTexperimental research oil the three-dimensional acupuncture carboii/carbon conpositewith the size of1minxlmm. Based oil three-dimensional CT image data set.micro-struct ma1chaarcteristics: of three-dimensional of acupuncture carbon/carbonconposiet material such as internal deefcts and ifber arrangement are analyzed if’oni asmaller-scale, volume porosity of the sanple is about13%by statistics，because theiiano-CT can observe a pore of smaller size，its volume porosity and the analysis resultsof micro-CT is relatively larger. Doing three-dimensional reconstruct ion on the resultsof CT test of nano-ofcus，doing three-dimensional visualization on porosity andinclusions, analyzing anangement of the ifbers of the interior of the sample, single ifberthat distributes in composite materials is observed from the result of reconstruction it isin harmony with the distribution of ifber bundle wliicli is observed rfom the analysisresults of scanning election microscopy. |
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