🔍 Key Concepts

• Properties and common uses of Babbitt metal in rotating machinery • Why bearing materials must be softer than the shaft and have good embedability and conformability • Typical lining materials used in high‑speed, high‑load turbine bearings

💭 Think About

• Which material from the list is known specifically as a traditional bearing metal rather than a structural or corrosion product? • For a high‑speed steam turbine, would you want the bearing surface to be very hard like steel or somewhat soft and sacrificial? Why? • Which option is commonly poured or bonded as a thin lining onto a stronger backing shell rather than used as the whole bearing?

✅ Before You Answer

• Eliminate any materials that are mainly structural metals (used for strength, not bearing surfaces) • Eliminate any materials that are brittle or corrosion products, not engineered alloys for sliding contact • Confirm which material is well‑known in marine engineering texts as a white metal used to line journal bearings