Type of sliding bearing damage (2)

Source: China Bearing Network Time: 2014-08-30

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5. When peeling the bearing bush; if the lining and the backing are lacking or poorly connected; during the working process of the bearing; under the effect of the load; the information of the partial lining will be peeled off from the bearing. The peeling is similar to the fatigue falling. But the fatigue is falling around the pit and irregular; the poorly formed peeling pit is relatively lubricated.
6. Corrosive lubricating oil is continuously oxidized during use; oxidation often attacks weak organic acids; it is corrosive to bearing materials, especially lead in cast copper-lead alloy; it is characterized by lead falling in dots; roughening the appearance.
Strong inorganic acids are more likely to corrode steel shafts.
The tin in the tin-based bearing alloy is oxidized; the outer surface of the bearing bush forms a black hard covering layer composed of SnO ₂ and SnO; the hardness is in the range of 200-600HS. This covering layer is extremely harmful to the bearing; it is very hard; Can scratch the outer surface of the journal; and make the bearing clearance smaller.
7. Corrosion (1) Cavitation cavitation is the appearance of external damage when the solid surface and the liquid touch and move relative to each other.
When the lubricating oil is in the low pressure zone of the oil film; the oil will form bubbles; after the bubble moves to the high pressure zone; the bubble collapses under the pressure effect; the impact force and the high temperature occur in the collapsed sputum; the solid appearance is here Under the repeated effect of impact; the data is exhausted and dropped; the appearance of the conflict is small pits; and then a spongy wound is developed.
Heavy-duty, high-speed; and the sliding bearing with large changes in load and speed; often cavitation.
(2) The fluid corrosive fluid violently impacts the solid appearance to form a fluid corrosion; the solid appearance presents a point-like flaw; the appearance of such damage is more lubricated.
(3) Electro-corrosion due to electrical leakage of motor or electrical equipment; sparks appearing between conflicting appearances; forming point-like scars on the appearance of conflicts; characterized by the fact that the damage reciprocates on the outer surface of the harder journal.
8. Fretting wear on the lining and backing; the interface between the bearing bush and the bearing housing; due to the combined effect of micro-oscillation (slip) and oxidation between the metal surfaces; constitutes adhesive wear, oxidation (corrosion) wear and abrasive wear 3 Compound wear in a variety of ways; called fretting wear; it will form a point-like scar on the interface.

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