There are many reasons for the wear of high-temperature fan bearings, which can be summarized as follows:

1. Normal fatigue wear of metals is an inherent characteristic of the metal itself;

2. Matching relationship issue: No matter how high the machining accuracy is during the machining process, parts can never achieve 100% matching of the component's mating surface. From a microscopic perspective, the metal's mating surface can only achieve 30-50%, so the small stress surface of the mating part is also one of the fundamental reasons for metal fatigue wear;

3. Installation problem: During the installation process, the installation position of the bearing cannot be well controlled or the clearance of the bearing cannot be effectively controlled, resulting in the bearing not being in an optimal state during operation. As a result, the running resistance increases, the temperature increases, and more torque is applied to the mating surface, causing relative movement between the bearing inner race and the shaft surface, causing wear and tear on the shaft.

4. Operation and maintenance issues: including poor lubrication of bearings, blockage of cooling system causing high operating temperature, loosening of fastening devices, etc.

For a long time, the solutions to the wear of high-temperature fan bearings have been the following: repair welding and processing, brush plating, thermal spraying, repair welding machine processing, and thermal spraying repair processes cannot be implemented online. Although brush plating can achieve online repair, the requirements for wear depth are relatively strict. Is there a better solution besides this?

Sorey carbon nano polymer material technology can achieve high-temperature fan bearing wear, which utilizes the unique mechanical properties of the material and targeted repair processes to repair the wear of large shafts such as fans online. The advantages of this technology in repairing high-temperature fan shaft wear are as follows: (1) Good adhesion, compressive strength, wear resistance, and comprehensive mechanical properties such as metal elastic deformation can be achieved online for repair, with high repair efficiency and no need for extensive disassembly of equipment. Generally, repair can be completed within 8 hours; (2) This technology is similar to a cold welding technology, which does not generate high temperatures during the online repair process, effectively protecting the equipment body from damage, and is not limited by unilateral wear of the shaft during the repair process; (3) After repair, there will be no metal fatigue wear during use. Under the premise of normal maintenance and upkeep of the equipment, its repaired service life is even longer than the service life of new components.

Case study: High temperature fan: The main shaft diameter is 160mm, the speed is 1500r/min, and the bearing position on the transmission side is worn. The wear width is 80mm, and the wear depth is about 0.2-0.5mm.