The Friction and Wear of Glass

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Abstract
A combination if electron photo micrographs and sensitive friction measurements indicate that the dry friction if glass may be due to surface melting under frictional heat. Stick slip phenomena are examined and the characteristic “tear drop” scratch is seen to be composed if a widening track if fused cracks ending in a “circular spot” if fused glass. Low temperatures or lubrication prevent this. For short durations at low loads, temperatures, and sliding speeds, most lubricants gave the same friction and wear results. When conditions become more severe or time more extended, various classes if lubricant excellence can be found. Wear measurements following “run in” indicate that with proper lubricants and operating conditions glass bearing surfaces can be operated at high loads and high temperatures.

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