5. Stripping

Manufacturing bearing lining and backing combined with the lack of power or a combination of poor in the process of bearing operation, the role of the load, partial lining materials from the bush is stripped down. Peel and fatigue spalling is somewhat similar, but fatigue spalling pits surrounding irregular, combined with bad peeling pits surrounding smooth.

6 Corrosion

Lubricant in the course of continuous oxidation, oxidation is often a weak organic acids, its bearing materials, especially lead corrosion of cast copper-lead alloy, its characteristics lead spotty off, so that the surface becomes rough.

Strong inorganic acids more corrosion of the steel journal surface.

Tin in the tin-based bearing alloy is oxidized in the bearing surface form a layer of SnO2 and SnO black hard cover layer, the hardness of 200 ~ 600HS range. This overlay is extremely harmful to the bearing, it is very hard and can scratch the surface of the journal and the bearing clearance becomes smaller.

7. Erosion

(1) cavitation

Cavitation is generated when the solid surface in contact with the liquid and for the relative motion in the form of surface damage.

When the lubricant in the film area of ??low pressure, the oil bubble, bubble movement to the high pressure area will form bubbles collapse under pressure, in the instant collapse of the great impact and high-temperature, solid surface in this repeated role of impact, material fatigue off, so that the friction surface of the small pit, and then developed into a sponge-like scars.

Overloading, sliding bearings of high-speed, load and speed changes, often cavitation.

(2) fluid erosion

Fluid heated to impact the solid surface will cause the fluid erosion appear point-like scars on the solid surface, this damage the smooth surface.

(3) electric erosion

Spark due to motor or electrical leakage between the friction surface, caused by the point-like scars on the friction surface, characterized by damage back and forth on the hard surface of the journal.

8 fretting wear


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