The design and fabrication of porous ceramic materials with anisotropic properties has, in recent years, gained popularity due to their potential application in various areas that include medical, energy, defense, space, and aerospace. Freeze-casting is an effective, low-cost, and safe method as a wet shaping technique to create these structures. To control the morphology of these materials, many critical factors were found to play an important role. In this dissertation, the processing parameters of the magnetic field-assisted freeze-casting method were optimized with a focus on comparing the structure obtained using vertical and horizontal magnetic fields and understanding the mechanisms that occur under different freezing modes. More specifically, this processing method was used to produce Al2O3 and B4C porous ceramics materials with unidirectionally-aligned pore channels. The effect of the vertical and horizontal magnetic field strength and direction, concentration of magnetic material (Fe3O4), cooling rate, and freezing time were examined. The resulting ceramics with highly aligned pore channels were infiltrated with molten metal to create metal matrix composites. The mechanical properties of these structures were measured and were subsequently correlated to their morphology and composition.
| Identifer | oai:union.ndltd.org:unt.edu/info:ark/67531/metadc1808395 |
| Date | 05 1900 |
| Creators | Bakkar, Said Adnan |
| Contributors | Aouadi, Samir, Berman, Diana, Young, Marcus L., Xia, Zhenhai, 1963-, Philipose, Usha |
| Publisher | University of North Texas |
| Source Sets | University of North Texas |
| Language | English |
| Detected Language | English |
| Type | Thesis or Dissertation |
| Format | xiv, 126 pages : illustrations (chiefly color), Text |
| Rights | Public, Bakkar, Said Adnan, Copyright, Copyright is held by the author, unless otherwise noted. All rights Reserved. |
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