Electrolyte and pyrotechnic pellets are two important components of
thermal batteries. Both electrolyte and pyrotechnic pellets are produced by cold
compaction of constituent powders. These compacts are integrated in the battery as
pellets with sufficient green density, green strength, calorific energy and burning
rate (for pyrotechnic only) to provide high performance batteries.
In this study, effects of physical properties of the used powders such as
particle size distribution, average particle size, particle shape and composition of
components and applied compression pressure and their interactions on green
density and green strength of electrolyte pellets and in addition, calorific energy
and burning rate of pyrotechnic pellets were examined.
Statistical experimental designs were constructed to investigate the main
and interaction effects of studied variables. 24 two factorial statistically designed
experiments&rsquo / results for pyrotechnic pellets exhibited that the compression pressure
and iron powder morphology were the most significant factors improving green density and break strength of pyrotechnic pellets. It was shown that the
compression pressure had a negative effect on burning rate. Both calorific output
and burning rate were increased significantly by increasing KClO4 fraction. In
addition, decreasing particle size of KClO4 had also a positive effect on burning
rate. The maximum calorific output was obtained at maximum KClO4 fraction. 23
two factorial statistically designed green strength and green density experiments&rsquo / results of electrolyte pellets revealed that, compression pressure was again the
dominating factor. Moreover, there was a tendency for higher green density with
lower MgO fraction and electrolyte powder average particle size. Besides, the
positive effect of decreasing average particle size on green strength was
investigated distinctly at low green density values.
From the thermal battery perspective, main and interaction effects of
variables on the characteristics of electrolyte and pyrotechnic pellets were
successfully examined.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12612959/index.pdf |
| Date | 01 February 2011 |
| Creators | Kalender, Volkan |
| Contributors | Ozbelge, Onder Hilmi |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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