4. Principle of ferrography
The test method is based on visual microscopic evaluation of particles extracted and deposited on a microscopic preparation called a ferrogram. It consists in assessing the wear mechanism by observing the shape, color and contours of these particles, and the effects of a magnetic field. Combined with other analytical tests, analytical ferrography helps determine the cause of a failure, and can thus contribute to failure prevention (and thus to preventive maintenance). It can be used to diagnose the type and severity of wear.
Ferrography, a technique successfully used to analyze lubricants or hydraulic fluids, was developed forty-three years ago by Foxboro Analytical. It involves fixing, in a capillary tube (or on a glass plate) placed in an intense high-gradient magnetic field (of the order of 5.10 5 G. cm- ...
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Principle of ferrography
Examples of particle separation and identification using non-analytical ferrography
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