Surface finish of HVOF coated surfaces defined for dynamic applications

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 429 KB
• Volume: 2004
• Category: Article
• ISSN: 1350-4789
• DOI: 10.1016/s1350-4789(04)00321-6

✦ Synopsis

The aerospace industry has been searching for a replacement to the traditional chrome coating process used in dynamic aircraft systems. Alternative coating processes such as HVOF can provide improved wear, fatigue and impact resistance compared with chrome, while reducing the environmental and health risks typically associated with hard chrome plating. The use of these coatings in dynamic applications has required an evaluation of the surfaces with respect to their interaction with seals and bearings. Traditional hard chrome surfaces tend to polish over time through the motion of seals and bearings. HVOF surfaces, however, do not polish and remain in their original condition for many years and dynamic cycles in service. Therefore, having an improper HVOF surface finish design can lead to reduced system performance throughout the life of the system. Extensive testing has been carried out by the partnership to identify the parameters involved.