Conference proceeding
Microstructure and properties of thermally sprayed functionally graded coatings for polymeric substrates
ITSC 2003: International Thermal Spray Conference 2003: Advancing the Science and Applying the Technology; Orlando, FL; USA; 5-8 May 2003, pp.1667-1673
05 May 2003
Abstract
The use of polymer matrix composites (PMC's) in the gas flow path of advanced turbine engines offers significant benefits for aircraft engine performance but their useful lifetime is limited by their poor erosion resistance. High velocity oxy-fuel (HVOF) sprayed polymer/cermet functionally graded (FGM) coatings are being investigated as a method to address this technology gap by providing erosion and oxidation protection to polymer matrix composites. The FGM coating structures are based on a polyimide matrix filled with varying volume fractions of WC-Co. The graded coating architecture was produced using a combination of internal and external feedstock injection, via two computer-controlled powder feeders and controlled substrate preheating. Porosity, coating thickness and volume fraction of the WC-Co filler retained in the coatings were determined using standard metallographic techniques and computer image analysis. The pull-off strength (often referred to as the adhesive strength) of the coatings was evaluated according to the ASTM D 4541 standard test method, which measured the greatest normal tensile force that the coating could withstand. Adhesive/cohesive strengths were determined for three different types of coating structures and compared based on the maximum indicated load and the surface area loaded. The nature and locus of the fractures were characterized according to the percent of adhesive and/or cohesive failure, and the tested interfaces and layers involved were analyzed by Scanning Electron Microscopy.
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Details
- Title
- Microstructure and properties of thermally sprayed functionally graded coatings for polymeric substrates
- Creators
- M IvosevicR KnightS KalidindiG PalmeseJ Sutter
- Publication Details
- ITSC 2003: International Thermal Spray Conference 2003: Advancing the Science and Applying the Technology; Orlando, FL; USA; 5-8 May 2003, pp.1667-1673
- Conference
- ITSC 2003: International Thermal Spray Conference 2003: Advancing the Science and Applying the Technology (Orlando, Florida, United States, 05 May 2003–08 May 2003)
- Publisher
- National Aeronautics and Space Administration
- Number of pages
- 1
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Chemical and Biological Engineering; Materials Science and Engineering
- Identifiers
- 991019201494604721