| Authors: |
Dimitris. K. Christoulis* / Ecole des Mines de Paris, C2P-Competence Center for spray Processing,
C.N.R.S.-U.M.R 7633
, France
Francois 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
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| Abstract: |
Despite cold spray is a relatively recent coating spray process, it has already found various industrial applications. Using the appropriate spraying conditions, cold spray offers the capability in achieving either dense or porous thick coatings. An attractive field for the application of cold spray coatings seems to be coatings with a controlled porosity. Current coatings with a controlled porosity are obtained using other thermal spray technologies (mainly plasma spray and HVOF), with mixed feedstock powders such as metal/polymer powder (Al-Alloy/Polymer, MCrAlY/Polymer) or metal/graphite powder (Al-Alloy/Graphite, Ni-Alloy/Graphite). In these cases material addition (polymer or graphite) generates the expected porosity or plays the role of the pores. However, using cold spray, innovative coatings of controlled porosity and with improved properties could be produced by using cold spray technology by using metal powders without any addition. In the present powder of Al-12Si with was sprayed onto steel substrates by cold gas dynamic spraying. The influence of the spraying conditions (pressure and temperature of cold spray gas, i.e. nitrogen) on microstructure was studied. Coating, porosity and the microhardness were also determined.
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