Wear Resistance Improvement of Small Dimension Invar Massive Molds for CFRP Components
- PDF / 1,138,535 Bytes
- 13 Pages / 593.972 x 792 pts Page_size
- 77 Downloads / 155 Views
JTTEE5 18:652–664 DOI: 10.1007/s11666-009-9397-z 1059-9630/$19.00 ASM International
Wear Resistance Improvement of Small Dimension Invar Massive Molds for CFRP Components C. Giolli, M. Turbil, G. Rizzi, M. Rosso, and A. Scrivani (Submitted February 28, 2009; in revised form August 5, 2009) 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.
Keywords
APS coatings, cermet coatings, friction and wear, INVAR tooling, properties
1. Introduction One of the most important tasks of composite manufacturing is its capability to produce components that require a precise and specified shape within tight dimensional tolerances. The first step of this composite-forming procedure is the cut and layup of several prepreg layers on a mold surface with varying orientation in order to produce a laminate of the desired thickness. The assembly is then covered with a flexible vacuum bag and cured in autoclave, in which heat and pressure are simultaneously applied; the selection of a proper cure cycle is a key factor in producing a high-quality composite part and for ensuring high production rates. A typical autoclave cure cycle consists of a two-hold cycle in which the temperature of the autoclave is first raised from room temperature to 135 C at a ramp rate
This article is an invited paper selected from presentations at the 2008 International Thermal Spray Conference and has been expanded from the original presentation, which was published in Thermal Spray 2008: Thermal Spray Crossing Borders, on CD-ROM, E Lugscheider, Ed., June 2-4, 2008 (Maastricht, The Netherlands), DVS-German Welding Society, 2008. C. Giolli, G. Rizzi, and A. Scrivani, Turbocoating S.p.A., Via Mistrali 7, 43040 Rubbiano di Solignano, Parma, Italy; and M. Turbil and M. Rosso, Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy. Contact e-mail: michele.turbil@ gmail.com.
652—Volume 18(4) December 2009
of 5 C/min and held for 160 min, and then raised to
Data Loading...
