Ceramic Bearings Ben Stratton Jake Allen. Overview Materials used in bearings What are ceramics? Why ceramic bearings over steel? Applications References.

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Presentation transcript:

Ceramic Bearings Ben Stratton Jake Allen

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

Materials Used Steel Bronze Plutonium Nylon Aluminum Wood Teflon Ceramic

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 )

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

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

Ceramic vs. Steel

Wear

Ceramic vs. Steel Temperature Rise

Ceramic vs. Steel Properties

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

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

References

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