Morphological characteristics of wear particles under normal conditions

During the running in period and normal operation period, the size of the abrasive particles generated by the bearing is generally 0.01-0.015mm, mixed with some metal powder. The number of abrasive particles generated by the new bearing during the running in period is higher than that during the normal operating period. After entering the normal operating period, the number of abrasive particles and metal powder will significantly decrease. The abrasive fragments appear in a thin and short shape under a microscope, with irregular cross-sections.

2. Morphological characteristics of faulty wear particles

The main failure mode of self-aligning roller bearings is fatigue pitting. The size of abrasive fragments formed by rolling fatigue and peeling is generally 0.025-0.05mm. Sometimes there are larger fragments mixed with some metal powder. The steel ball abrasive fragments of ball bearings usually appear in the form of roughly circular, radially separated rose petals; The abrasive debris in the raceway presents a roughly circular surface fragmentation form; The roller abrasive debris of roller bearings usually presents in a curled rectangular shape with a length equal to 2-3 times the width; The abrasive debris on the raceway generally presents an irregular rectangular shape.