By Hua-Tay Lin, Andrew Gyekenyesi, Linan An, Sanjay Mathur, Tatsuki Ohji
Contributions from 3 symposia that have been a part of the thirty fourth overseas convention on complicated Ceramics and Composites (ICACC), in
the present quantity represents 15 contributions from the above indexed symposia that include the newest advancements in engineering ceramics for power applied sciences, thermal administration using both hugely conductive or insulating fabrics, in addition to advances in regards to the usage of ceramics for sensors.
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Extra info for Advanced Materials for Sustainable Developments: Ceramic Engineering and Science Proceedings, Volume 31
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The power factors of the Gd doped samples exhibited the slightly larger values than those of the ND samples. 8 x 10"5 W/mK2 at 897 K, which was almost ten times larger than those of the ND samples. DISCUSSION In accordance with the magnetic analysis, the ferromagnetic components were observed at 300 K for all the samples. These were observed even for the ND samples. Hence, this may be caused by the impurity elements in the graphite power. Since graphite powder was known to contain some impurities such as Fe, the carbonized SiC sample may also contain these magnetic impurities which resulted in exhibiting the ferromagnetic behavior.
H. Wang, Sintering Dense Nanocrystalline Oxide with-out Final Stage Grain Growth, Nature, 404, 168-71 (2000). 13 Z. Razavi Hesabi, M. K. Sadrnezhaad, Suppression of Grain Growth in Sub-micrometer Alumina via Two-step Sintering Method, J. Europ. Ceram. Soc, 29, 1371-1377 (2009). 14 K. -N. P. Kumar, K. Keizer, A. J. Burggraaf, T. Okubo, H. Nagamoto, and S. Morooka, Densification of Nanostructured Titania Assisted by a Phase Transformation, Nature, 358, 48-51 (1992). I. -H. -H. -Y. Kim, Preparation of Nanostructured T1O2 Ceramics by Spark Plasma Sintering, Materials Research Bulletin, 38, 925-930 (2003).
Figure 11. Temperature profile at 30, 50, and 60s after ignition. 28 W/ (m K)) results in a very narrow reaction front. Thermal conductivity was found to be the variable that affects the temperature profile of SHS reaction most. It governs the reaction propagation speed, reaction front thickness, and pellet cooling after reaction, among other factors. For example just a 15% increase of thermal conductivity of reactants resulted in reaction not propagating. This suggests that porosity of a pellet (thermal conductivity is strongly dependant on pellet porosity) affects SHS reactions.