Manufacturing of a Metal Matrix Composite Coating on a Polymer Matrix Composite Through Cold Gas Dynamic Spray Technique
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Manufacturing of a Metal Matrix Composite Coating on a Polymer Matrix Composite Through Cold Gas Dynamic Spray Technique Alessia Serena Perna, Antonio Viscusi, Antonello Astarita, Luca Boccarusso, Luigi Carrino, Massimo Durante, and Raffaele Sansone (Submitted September 11, 2018; in revised form November 22, 2018) In this work, the manufacturing through cold gas dynamic spray (cold spray or CS) of metallic composite coatings of Al-Al2O3 on organic composite substrates with thermoplastic PLA matrix and hemp fibers was studied. Alumina powders, with a mean diameter of 50 lm, were used blended with aluminum powders in three different weight concentration percentages (0, 15, 20, and 45%) as feedstock material in order to highlight and discuss the variations of the coating surface properties depending on the alumina percentage. The coatings were produced by using a low-pressure cold spray equipment. A detailed experimental campaign, including microstructural observations and confocal microscopy, was carried out to study the structure of the coatings. Moreover, the tribological behavior of the coatings was studied through both scratch test and pin-on-disk test. The experiments showed that a small addition of alumina improves the compactness of the coating and its resistance to scratch and wear behavior. Keywords
alumina, aluminum powder, ceramics, cold spray, hemp, metal matrix composite, natural fiber composite
1. Introduction In the recent years, more and more interest was directed to the tailoring of materials: aiming to save resources and optimize properties, the materials are engineered to better respond to the requests that arise during commissioning (Ref 1). In this context, the composite materials have emerged thanks to the possibility of totally varying their characteristics by suitably choosing fibers and matrices (Ref 2-4). A further opportunity is to give different properties to the substrate and bulk material: it may be important, for example, to provide scratch and wear resistance to the workpiece surface and to assign the mechanical properties to the innermost layer (Ref 5). A possibility that has not yet been thoroughly explored, having to face the difficulty of coating thermosensitive materials such as polymer matrix composites, is producing composite coatings on composite substrates (Ref 6).
This article is an invited submission to JMEP selected from presentations at the International Symposium on Dynamic Response and Failure of Composite Materials (Draf2018) held June 12-15, 2018, on the Island of Ischia, Italy, and has been expanded from the original presentation. Alessia Serena Perna, Antonio Viscusi, Antonello Astarita, Luca Boccarusso, Luigi Carrino, and Massimo Durante, Department of Chemical, Materials and Production Engineering, University of Naples ‘‘Federico II’’, P.le Tecchio 80, 80125 Naples, Italy; and Raffaele Sansone, Sophia High Tech s.r.l, Via Romani, 228, 80048 SantÕAnastasia, Naples, Italy. Contact e-mail: [email protected].
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