1. YSZ Pellets for Solid Oxide Fuel Cells Final Presentation Presented by: Lazo Trkulja Advisor: Professor Elliott Slamovich Graduate Student Advisor: Jeff Reding

2. Outline Overview of SOFC’s Showing how research fits into big picture YSZ pellet processes Ball milling, pressing, bisquing Obtaining Data for comparisons Profilometer and peak edge removal measurements Results and Conclusions

3. Solid Oxide Fuel Cells How do SOFC’s work? Anode ReactionCathode Reaction Picture obtained from http://www.iit.edu/~smart/garrear/fuelcells.htm.

4. Goal Electrolyte Anode rather than

5. YSZ Pellet Processing Combining components to form a slurry YSZ powder, binder (Duramax HA-8), dispersant (Duramax D-3005), DI water Ball Milling Followed by drying of slurry in oven Pellet Pressing Application of stearic acid to die Approx. 68 MPa for approx. 1 min. Bisquing Early stage of sintering.

6. YSZ Pellet Processing

7. Profilometer Tencor Surface Profilometer stylus

8. Profilometer Average Surface Roughness ( ) Used to compare pellets

9. Roughness Data

10. Data

11. Histogram

12. Data

14. Edge Removal Data Measuring Edge Removals

15. Edge Removal Data

17. Conclusions Definitive pellet set cannot be reached Trade-off between 2% and 4% sets User determines pellet priorities Pellet pressing is key in pellet quality Uniform application of stearic acid on die Careful handling of pellet after ejection

18. Acknowledgements Professor Elliot Slamovich Jeff Reding MSE faculty, staff, and students

19. Questions?

20. Trade-off Factor2% Binder Set4% Binder Set StrengthX Lower Roughness XX Avg. Edge Removal Length X Lower Number of Edge Removals X