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1514 |
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Tuesday, June 03, 2008, Auditorium 2 5:00 PM Junior Session This session will deal with different topics, most promising young talents, both from industry and universities will report shortly about their work. This session is accompanied by a special poster exposition. All visitors of this session are allowed to elect their favorite contribution, the winner will be anounced on the awards banquet |
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Three-dimensional analysis of cold sprayed coatings using microtomography |
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Gilles Rolland* / Ecole des Mines de Paris - ParisTech, Centre des Matériaux (CNRS 7633), C2P-Centre de Compétence en Procédés de Projection (C2P), France François Borit / Ecole des Mines de Paris - ParisTech, Centre des Matériaux (CNRS 7633), C2P-Centre de Compétence en Procédés de Projection (C2P), France Vincent Guipont/ Ecole des Mines de Paris - ParisTech, Centre des Matériaux (CNRS 7633), C2P-Centre de Compétence en Procédés de Projection (C2P), France Michel Jeandin/ Ecole des Mines de Paris - ParisTech, Centre des Matériaux (CNRS 7633), C2P-Centre de Compétence en Procédés de Projection (C2P), France Dominique Jeulin/ Ecole des Mines de Paris - ParisTech, Centre des Matériaux (CNRS 7633), C2P-Centre de Compétence en Procédés de Projection (C2P), France Ludovic Bara/ Centre de Ressources Techniques, France Christine Bourda/ Metalor, France |
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In this work, the microstructure of silver coatings obtained by cold spraying with a fine and a rather coarse powder were investigated. Cold-sprayed microstructures strongly depend on the deposition process parameters. These parameters have an influence on porosity, plastic strain, particle-to-particle bonding mechanisms. The originality of this study rests on the use of X-ray microtomography, which is shown to be a very powerful technique to investigate into cold-sprayed coatings. Several samples were machined from coatings by electro-discharge machining (EDM) then scanned using microtomography. Porosity fraction was determined by three-dimensional image analysis and compared to classical two-dimensional analysis of micrographs. A difference between the two methods was exhibited, which showed sample preparation effects. Consequently, X-ray microtomography seems to be well adapted to study cold-sprayed coatings thoroughly. Another result from this work was the characterization of the morphology of pores and deformed particles. Bonding mechanisms in cold spray could therefore be discussed. In addition, the knowledge on deformed particles allowed to simulate cold-sprayed coatings with build-up models. |