Wear Resistance Improvement of Small Dimension Invar Massive Molds for CFRP Components |
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| Authors: | C Giolli M Turbil G Rizzi M Rosso A Scrivani |
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| Affiliation: | (1) Turbocoating S.p.A., Via Mistrali 7, 43040 Rubbiano di Solignano, Parma, Italy;(2) Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; |
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| Abstract: | Invar alloy (Fe-36%Ni) is used in industrial applications that require high dimensional stability because of its exceptionally
low thermal expansion coefficient. The purpose of this work is to improve the wear resistance of the molds in the production
of carbon-fiber reinforced plastic (CFRP) components applying thermal spray coatings. Four different kinds of commercial powders
were coated on an Invar substrate: ZrO2-8Y2O3, Al2O3-13TiO2, and Cr2O3 by air plasma spray (APS) and WC-CoCr by high-velocity oxygen fuel (HVOF). Metallographic microscopy observation and scanning
electron microscopic analysis were carried out, microhardness and fracture toughness were evaluated using the microindentation
method. Friction behavior and wear resistance were evaluated with pin-on-disk apparatus. Tungsten carbide coating had the
lowest average coefficient of friction. Cermet and alumina-titania coatings showed the lowest wear mass loss. Among the APS
ceramic coatings, alumina-titania exhibited the best wear behavior and the HVOF cermet coating exhibited the best behavior
among all the coatings. |
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