[Best of the Web] Source: Machine Design

Gears are a common component of modern machinery, found in gearheads, watches, motors, furnaces, and automation equipment. Due to the ease of manufacturing and the variety of alloys available, metal alloys are the most common material used for gears. However, alternatives are available: ceramic and metal injection molding offer higher strengths and other properties that make them desirable.

Read more about the advantages of various metal gears, ceramic gears, and the growing use of possible use of metallic glass as a future replacement material.