Abstract
This chapter discusses the high pressure and vacuum, and provides the effects of pressure on lubricants. This chapter further describes the loss of surface films in high vacuum. Surface contaminant films of soaps, oils and water, and surface layers of oxides enable components to rub together without seizure under normal atmospheric conditions. Increasing vacuum causes the films to be lost, and reduces the rate at which oxide layers reform after rubbing. The chance of seizure is therefore increased. Seizure can be minimized by using pairs of metals, which are not mutually soluble.
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