The composition of Babbitt metal (utilized for bearing manufacture) includes__________________?
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Answer: A. Mainly tin (85%) and lead
Explanation
Babbitt metal formulation primarily consists of a high percentage of tin along with hardening elements. Tin concentrations around eighty-five percent provide the soft matrix necessary for anti-friction journal linings. Adding antimony and copper to the tin base creates hard load-bearing crystals within the soft matrix. Bearing manufacturing requires specialized alloys that balance softness with adequate compressive strength. Tin-based Babbitt alloys are renowned for their excellent embeddability and conformability properties. Precise alloy composition ensures consistent performance under demanding high-speed rotational loads.
Heavy industrial turbines utilize tin-based Babbitt bearings to support massive rotating shafts safely. Mechanics pour molten Babbitt alloy into bearing shells during equipment maintenance and repair procedures. Quality control standards mandate strict adherence to tin and lead percentages in bearing metals. Saw dust and iron dust mixtures are completely useless for manufacturing high-precision journal bearings. Zinc and aluminum form different alloy systems like die-casting metals rather than Babbitt bearings. Copper and aluminum form bronzes or specialized structural alloys rather than soft bearing Babbitt metal.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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