Browsing by Subject "graphite"
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Item Design, Fabrication and Testing of Graphite Bipolar Plates for Direct Methanol Fuel Cells(University of Texas at Austin, 2009-09-15) Alayavalli, Kaushik; Bourell, David L.Direct Methanol Fuel Cells (DMFCs) are clean energy devices that convert chemical energy into electrical energy. The bipolar plate component of the DMFC is required to be fluid impermeable to prevent fuel leakage and electrically conductive to collect the electrons produced within the cell. Graphite possesses the properties of high electrical conductivity, low weight and resistance to corrosion that make it an attractive material for bipolar plates. However, the poor mechanical properties of graphite lead to prohibitive machining costs. The indirect Selective Laser Sintering (SLS) process, involving the laser sintering of graphite powders mixed with a phenolic resin binder, offers the advantage of complex part production and testing of prototype bipolar plates in short times. The current research deals with the production of bipolar plates for DMFC's by utilizing indirect SLS followed by post processing steps.Item Experimental Testing of Thick Wall Graphite Composite Rings(0000-00-00) Headifen, R. N.;Test results are presented from pressurizing thick walled graphite hoop wound composite rings to very high internal radial pressure. Hydraulic pressures exceeding 40,000 psi were obtained. The testing was performed on rings wound whh two different resins, a cyanate ester and a Bismaleimide (BMI) resin. To prevent axial delaminations at these high pressures, a thin bidirectional cloth G 11 lining was used inside the rings. The rings were monitored with strain gages and acoustic probes as the pressure was applied. Flaw-free cyanate ester rings survived the testing, indicating that the nominal transverse (radial) compressive strength of hoop-wound rings is higher than 40,000 psi.Item Removal of Emulsified Oils in Graphite Ore Medium(University of Texas at Austin, 1974-11) Martinez-Pereda, P.; Gloyna, E.F.