1. Ceramic Bearings Ben Stratton Jake Allen

2. Overview Materials used in bearings What are ceramics? Why ceramic bearings over steel? Applications References Summary

3. Materials Used Steel Bronze Plutonium Nylon Aluminum Wood Teflon Ceramic

4. What are Ceramics? Definition: any inorganic nonmetallic solids processed at high temperatures. Properties: hard, stiff, high heat and corrosion resistance, low density Advanced: Silicon Nitride (Si 3 N 4 )

5. Ceramic Bearings What is a hybrid bearing? Ceramic balls Steel rings

6. Ceramic vs. Steel Friction/Vibration Ceramic High surface finish Smaller contact ellipse with race Lubrication Ceramic requires less lubrication

7. Ceramic vs. Steel

8. Wear

9. Ceramic vs. Steel Temperature Rise

10. Ceramic vs. Steel Properties

11. Ceramic vs. Steel Speed Ceramics can run at higher rpm Cost Ceramics cost 5% more than steel

12. Applications Medical Machine tools Turbines RC vehicles High speed electric motors Pumps Aerospace

13. References www.bocabearings.com www.evolution.skf.com www.bearings.com www.bardenbearings.com www.ceramicbearings.com

14. Summary Lower friction Less wear Smaller temperature rise Higher speeds Slightly higher cost