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4866 |
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Wednesday, May 11, 2016, Yellow River Hall 2:40 PM Aviation Industry II |
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Effect of chemical surface treatment of polymer composites on the formation of erosion-resistant coatings |
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Axelle Elrikh / University of Limoges - SPCTS UMR CNRS 7315, France Simon Goutier*/ Université de Limoges, France Armelle Vardelle/ Université de Limoges, France Gordon Armstrong/ University of Limerick, Ireland |
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Carbon fiber reinforced composites (CFRP) exhibit light weight coupled with high stiffness and strength along the direction of reinforcement. They also have a good corrosion resistance and low thermal expansion coefficient compared to metals. However, they are more sensitive to the impact of solid particles (e.g. sand particles) and droplets (e.g. rain droplet) which have a critical impact on their reliability in service. Various solutions are already used (metallic caps, organic paints, tapes), but did not demonstrate sufficient durability; they also noticeably increase the weight of the components. Solutions under development involve sol-gel coatings, cold sprayed and thermal sprayed coatings. However, the low surface energy of the polymer matrix and its low chemical reactivity proved to be an issue when bonding the metallic or ceramic coating to the polymer surface. Previous works carried out in this laboratory have shown that a way to increase the coating adhesion was to remove the superficial layer of polymer, to favor the coating formation on the carbon fibers. This can be done by using a chemical etching that dissolves the superficial resin. This study aims to understand the effect of this chemical etching i) on the composite surface and its properties (integrity, wettability, &) and ii) on the formation of plasma-sprayed ceramic coating on the composite surface. The approach consisted in using different chemical solutions and observing the modification of the CFRP by scanning electron microscopy, infrared and X-ray photoelectron spectroscopy, surface roughness and wettability measurement. The chemically attacked substrates were then coated with a plasma-sprayed ceramic layer (about 100 µm thick) and the interface compositecoating was observed. |