Bearings are commonly manufactured from materials such as__________________?
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Answer: B. Babbitt metal
Explanation
Babbitt metal has a soft microstructure that embeds abrasive wear particles to protect shafts. Its low friction coefficient prevents excessive heat generation during high-speed rotational sliding contact. The alloy's soft matrix yields locally under high loads to distribute contact stresses evenly. Babbitt metal is typically composed of tin, lead, antimony, and copper alloy constituents. The material features hard microscopic crystals embedded in a softer, pliable supporting matrix. Invented by Isaac Babbitt in eighteen thirty-nine, it revolutionized industrial rotating machinery design.
Journal bearings in large steam turbines and industrial motors frequently utilize babbitt metal linings. Using a softer bearing lining protects expensive rotating steel shafts from catastrophic wear damage. Proper lubrication combined with babbitt linings ensures reliable long-term operation of heavy machinery. Cast iron is too hard and brittle to serve effectively as a conformal bearing lining material. Pig iron is a crude, high-carbon intermediate furnace product completely unsuitable for precision machinery. Steel provides high structural strength but exhibits poor antifriction properties when sliding against steel shafts.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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