Further Developments in Internal Diameter HVOF Application of WC-CoCr for Hard Chrome Replacement in Critical Applications Such as Landing Gear

A dedicated Internal Diameter HVOF technique is described and results of coating characterization tests such as Fatigue Tests and Pin-on-Disk tests are presented and compared with Standard HVOF coatings.WC-CoCr 86 10 4 applied to an Internal Diameter of 150 mm was tested using an Internal Diameter Pin-on-Disk test developed by the Institute of Materials Science at the University of Applied Sciences in Gelsenkirchen. Wear results compared with Standard HVOF demonstrate initial similarities. Because of the lack of a standardized Inside Diameter Fatigue Test, coatings applied with the same dedicated Inside Diameter technique have been subjected to standard Axial Fatigue Tests. These results are presented and discussed as well as potential for further developments based on this Internal Diameter HVOF technique are discussed.