Title: VOLUMETRIC, HIGH RESOLUTION X-RAY COMPUTED TOMOGRAPHY

Abstract:
Volumetric, high resolution Gray computed tomography provides a unique window for observing processes and Arterial evolution in the interior of optically opaque objects. This noninvasive technique allows one image features with spatial resolution approaching that of optical microscopy, and, since its development a little over one decade ago, high resolution x-ray computed tomography has been applied to a number of inbreeding studies of changing microstnucture. After a brief discussion of computed tomography, result of studies will be highlighted here: chemical vapor Infiltration (CVI) of woven preform ceramic matrix composites (CMCs) and crack closure processes in. a compact tension sample. Differences in gas: flow pathways in deferent preform Spas are discussed a is the change in pathways during CVI of a SiC cloth preform. In the second example, crack closure as a function of position Is summarized for different points on the unloading displacement curve for an AJ sample.
(Ref. SXVIII-010-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
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