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7296 |
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Repairing blade-like shaped parts by the metal knitting CGS method |
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JAVIER Sanchez / University of Barcelona, Spain Rodolpho Vaz / Thermal Spray Center. Department of Materials Science and Physical Chemistry, University of Barcelona, Spain Vicente Albaladejo/ Thermal Spray Center. Department of Materials Science and Physical Chemistry, University of Barcelona, Spain Unai Ocaña/ Thermal Spray Center, Spain Irene Garcia Cano/ Thermal Spray Center. Department of Materials Science and Physical Chemistry, University of Barcelona, Spain |
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Cold Gas Spraying (CGS) is a thermal spray process capable to produce dense and thick coatings by the spraying of powders under high velocity and relative low temperature. The high efficiency of deposition, the thickness of each pass and the density of the material deposited enabled this technology to be used for repairing metal parts. When used for repairing, CGS typically is sprayed at an angle of 90º (or as close to 90º as possible) not every part geometry is suitable for CGS repairing. A blade or a blade-like shape is typically difficult to repair by CGS because of the geometrical constraints associated with this technique when building parts by additive manufacturing. In this work we present the repair of blades or blade-like shaped parts using the Metal Knitting method based on the performance of certain spraying movements that build near squared shapes step by step like in a knitting process. This method allows to grow thin and straight walls using cold gas spray and so it is well suited for the repair of blades or parts with blade-like geometries. This method has been tested for the repair of several materials, the parameters of the Metal Knitting process have been evaluated and optimized. The final parts have been characterized including structure, porosity and hardness. |