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Abstract

The maximum temperature at which a mechanical system can operate is often determined by the need for lubrication. The paper considers the various heat sources, ambient temperature, mechanical or chemical inputs, and flash temperatures, and discusses their influence on different types of lubrication.

The actual temperature limitations are imposed by physical or chemical changes in the lubricant itself, or by changes in a specific lubrication mechanism such as adsorption. The nature of these types of change is described, together with the dominant importance of residence time on the extent of deterioration.

Some actual temperature limits for particular lubricants are listed, and the paper suggests some possible design techniques for extending the upper temperature limits for lubrication.

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High-Temperature Lubrication

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