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Viscoelastic toughening of refractory ceramics
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http://hdl.handle.net/1860/284
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| Title: | Viscoelastic toughening of refractory ceramics |
| Authors: | Akpan, Edem T. |
| Keywords: | Materials engineering
Refractory materials -- Testing
Aluminum silicates |
| Issue Date: | 24-May-2004 |
| Abstract: | This dissertation represents the results of an experimental study of the effects of Na2O and CaO on the microstructure, flexural strength, fracture toughness and thermal shock resistance of aluminosilicate refractory ceramics. The addition of 4-6 wt% of Na2O is shown to alter the microstructure and also improve the thermal shock resistance, which is characterized by the number of cold shock cycles to failure. The photomicrographs obtained using the scanning electron microscope, SEM, and the elemental maps obtained using the energy dispersive X-ray spectroscopy, EDS, show that the addition of Na2O decreases the formation of mullite as the level of Na2O is increased. Also, the formation of tiny needles/laths is seen as the level of Na2O is raised. The volume of the needle-like crystals is much more pronounced in the batch of materials doped with 5wt.%Na2O and 6wt.%Na2O … |
| URI: | http://dspace.library.drexel.edu/handle/1860/284 |
| Appears in Collections: | Drexel Theses and Dissertations
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