F-14 Wing Lug Coating Investigation
Abstract
F-14 wing lugs have been painted with a special coating which prevents wear of the bearing and lug, and subsequent failure of the wing. The coating originally designated for this application contained talcs (extender pigments) which contain small concentrations of asbestos, causing discontinued manufacturing of the talcs and the coating. Since the performance of this coating is considered critical to flight, a replacement was needed to prevent grounding of the F-14 fleet. One requirement for the application of this coating was that it be processed by allowing the filler particles to settle, and subsequently decanting and applying the resin-rich upper layer of the mixed coating. The original coating was reformulated by replacing the talcs with non- asbestos pigments with nearly equivalent chemical composition. This resulted in a pigment systems which doom not settle an much as that in the original coating, and the applied film is far less wear resistant. Alternative highperformance coatings also displayed relatively poor abrasion resistance compared to the original coating. A mechanism for these results has been proposed. It is suspected that pigment-rich coatings with particles protruding through the surface allow the concentration of shear stresses Abrasion Coatings Bearing Wing lug.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1992
- Accession Number
- ADA257384
Entities
People
- Charles R. Hegedus
- Donald J. Hirst
Organizations
- Rutgers University–Newark