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5436 |
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Multi-layer ceramic coatings applied by thermal spraying process on refractory bricks for high temperature applications |
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David Franco* / University of Limoges, France Fabio Vargas Galvis / University of Antioquia / Gimacyr - Gipimme, Colombia María Esperanza Lopez Gomez/ University of Antioquia / Gimacyr - Gipimme, Colombia Helen Ageorges/ University of Limoges / SPCTS Laboratories, France E. Restrepo/ University of Antiquia, Colombia R. Cardona/ University of Antiquia, Colombia S. Ursula/ University of Antiquia, Colombia |
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Multi-layer ceramic coatings applied by thermal spraying process modify the surface of conventional ceramic refractory substrates and therefore Al2O3-TiO2 and Al2O3 feedstock powders were used in order to manufacture by flame spraying process and onto conventional Alumina-Silica substrates, the base and the top coats respectively. Subsequently, the wear performance of coated and uncoated refractories was evaluated under the same abrasive sliding contact conditions from room temperature (25°C) to high temperatures (250, 500, 700 and 1000°C) using a pin-on-disc test. The results of wear performance obtained were compared with those from electromelted Alumina-Zirconia-Silica (AZS) and ±/²-Alumina refractories currently used in metallurgical, glass and cement industries, which were evaluated under the same wear conditions. The results obtained indicate that the deposited coatings protect the substrates improving the tribological performance of uncoated refractories making the wear behavior closer to the electromelted AZS used as reference materials. Keywords: Multi-layer, Plasma Spraying, Electro-melted refractory, Conventional refractory and Tribology at high Temperatures. |