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7328 |
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Thursday, May 05, 2022, Hall -2.32/33 4:00 PM General Plant Engineering |
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High velocity suspension flame sprayed (HVSFS) and atmospheric plasma sprayed (APS) Al2O3-TiO2 coatings on porous aluminium substrates |
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Marvin Sauter* / University of Stuttgart, Germany Venancio Martínez García / IMTCCC, Germany Olga Schwabe/ Putzier Oberflächentechnik GmbH, Germany Kerstin Ernst/ Putzier Oberflächentechnik GmbH, Germany Andreas Killinger/ IMTCCC, Germany |
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In a novel approach for guiding elements of sawing machines wear resistant coatings were applied on open-porous AlMg3 substrates by means of high velocity suspension flame spraying (HVSFS) and atmospheric plasma spraying (APS).The challenge is to establish a wear resistant coating but simultaneously maintain the open-porous structure that is necessary to serve as a permeable structure for liquid cooling or lubricant media under operation. In a first approach, a water based suspension containing a mixed Al2O3-TiO2 powder for HVSFS and a commercial Al2O3-TiO2 powder for APS were used to deposit dense and well adherent mixed-oxide coatings. As the substrates exhibit an open-porous structure and a well defined pore size distribution, a transpirative cooling during the spraying process is possible. Whilst transpirative cooling is not needed in the case of APS, it is necessary for HVSFS in order to ensure a low thermal impact on the fragile pore structure and preserve the open-porosity of the substrate. The HVSFS and APS coatings are characterized and compared by the means of microscopy, hardness indentation and tribological testing. |