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The turbine barring gear operates under typical low-speed and heavy-load conditions. During unit start-up, shutdown, coast-down, and zero-speed barring operations, the contact surface between the journal and bushing is subjected to extremely high load. A stable lubricating oil film can hardly be formed, which readily causes failures such as journal adhesive wear, scoring, and even shaft seizure. These issues not only raise maintenance costs but also pose a direct threat to the safety of unit start-up and shutdown.
Root Causes of Journal Adhesive Wear
Under low-speed and heavy-load conditions, dry friction or boundary friction tends to occur at the instant of start-up and shutdown. Local high temperature generated by friction softens the metal surface layers and results in metallic adhesion. Upon relative rotation, the adhered metal is torn and peeled off, producing adhesive wear. Long-term operation will lead to reduced journal accuracy, barring jamming, abnormal current fluctuation, and may even cause bearing damage and excessive rotor eccentricity.
Core Anti-wear Principle of Copper Alloy Material
Copper alloys feature excellent self-lubricating property, wear resistance, and thermal conductivity. With moderate hardness, they can accommodate hard impurities on the friction interface and prevent scoring of the high-precision journal. Outstanding thermal conductivity quickly dissipates frictional heat to avoid adhesion induced by local high temperature. Combined with the solid-lubricant structure, lubricating medium can be released during operation to form a stable protective film, so as to reduce adhesive wear fundamentally.
Service-condition Adaptation Advantages
The copper alloy formula and structural technology are optimized for complex barring-gear operating conditions. Adopting a high-strength copper-alloy matrix and precision embedded self-lubricating structure, the product can rapidly form a uniform lubricating transfer film without relying on hydrodynamic oil film under harsh conditions including zero-speed and intermittent barring, completely avoiding metallic adhesion.
With excellent vibration resistance and high-low temperature resistance, it effectively lowers the risks of barring jamming and journal wear, reduces the frequency of shutdown maintenance, and provides solid support for the long-term safe operation of the unit.
