Some Aspects of the Heat of Adsorption in the Function of a Boundary Lubricant

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Abstract
The empirical relationship between the rate of adhesive wear and the ratio of load to hardness has been extended to consider the presence of a lubricant film on the surface. The expression contains two parameters, one of which is specific to characteristics of the lubricant and the other specific to characteristics of the sliding metal couple. A model is developed which considers the heat of adsorption as the controlling factor in the effectiveness of the boundary lubricant. The wear rate of a copper pin sliding against a steel disk with n-hexadecane as lubricant was determined as a function of load, sliding velocity, and temperature. Confirmation of the model is observed and the calculated heat of adsorption is 11.5 kcal per mole. The estimated wear coefficient for that portion of the real area of contact which is metal-metal is about 0.2. This suggests that the probability will be near unity that a wear partiole will be formed.

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