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Definition. AW agents are effective only up
to a maximum temperature of about 250°C (480°F). Unusually
heavy loading will cause the oil temperature to increase
beyond the effective range of the antiwear protection. When
the load limit is exceeded, the pressure becomes too great
and asperities make contact with greater force. Instead of
sliding, asperities along the wear surfaces experience
shearing, removing the lubricant and the oxide coating.
Under these conditions the coefficient of friction is
greatly increased and the temperature rises to a damaging
level.
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