Wear Part Repairing of Aircraft Refueling Probe Guide Rail by High-Velocity Oxygen Fuel Sprayed WC-17Co Alloy Coating

A certain type aircraft refueling probe was subjected to wear and spalling in the chrome-plated layer of the extenal guide rail. WC-17Co alloy coating by high-velocity oxygen fuel (HVOF) spraying was used to repair the guide rail. The micromorphology, mechanical properties and wear resistance of the HVOF coating was studied. The refueling probe with the repaired guide rail was subjected to 20 full-stroke extending and retracting simulation tests, 30 ground running tests and 50 air flight running tests. The results show that the hardness of the HVOF coating was up to 1 041 HV and the bonding strength with the guide rail substrate was greater than 85.4 MPa. The toughness of the coating was good, the wear resistance was higher than that of electroplated chrome layer, and the wear degree of the grinding surface was small when paired with the electroless nickel plated wheel. After extending and retracting simulation tests and running tests of the probe assembled with the repaired guide rail, the HVOF coating on the guide rail showed no wear features and the repaired guide rail was in good condition.