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Examination of scanning electron microscope and computed tomography images of pica
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Shklover, Valery Lawson, John W. Stackpoole, Margaret M. |
| Copyright Year | 2010 |
| Description | Micrographs of PICA (Phenolic Impregnated Carbon Ablator) taken using a Scanning Electron Microscope (SEM) and 3D images taken with a Computed Tomography (CT) system are examined. PICA is a carbon fiber based composite (Fiberform ) with a phenolic polymer matrix. The micrographs are taken at different surface depths and at different magnifications in a sample after arc jet testing and show different levels of oxidative removal of the charred matrix (Figs 1 though 13). CT scans, courtesy of Xradia, Inc. of Concord CA, were captured for samples of virgin PICA, charred PICA and raw Fiberform (Fig. 14). We use these images to calculate the thermal conductivity (TC) of these materials using correlation function (CF) methods. CF methods give a mathematical description of how one material is embedded in another and is thus ideally suited for modeling composites like PICA. We will evaluate how the TC of the materials changes as a function of surface depth. This work is in collaboration with ETH-Zurich, which has expertise in high temperature materials and TC modeling (including CF methods). |
| File Size | 3543718 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110015931 |
| Archival Resource Key | ark:/13960/t8wb05b5g |
| Language | English |
| Publisher Date | 2010-10-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Scanning Electron Microscopy Images Carbon-phenolic Composites Fiber Composites Ablation Refractory Materials Carbon Fibers Thermal Protection Temperature Effects Tomography Ablative Materials Thermal Conductivity Photographs Charring Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
