Abrasive wear in hard thin films coated dies in hot extrusion aluminum

Herrera, J. y Martínez, D. y González, R. y Rodríguez, J. (2012) Abrasive wear in hard thin films coated dies in hot extrusion aluminum. Química Hoy, 2 (2).

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Resumen

Abrasive wear resistance ofbat extrusionAISI H13 coated dies used to produce extruded aluminum micro multivoid tubes was studied. In this process, aluminum and dies are constantIy under high friction conditions producing prematuTe die wear; aluminum or lubricant adherence on die surface layer, is caused by this phenomenon with product rejection as a consequence. The hot ex1rusion dies most important properties are hot hardness, wear resistant and surface finishing. Extrusion dies coated witb. hard thin film coatings by physical vapor deposition. PVD and chemical vapor deposition, CVD, were utilized and thermal diffusion treatment as 3D alternative. The thin film coatings mechanical propemes, nano indentation, and SEM surface anaIysis were performed to characterize coatings and dies. Thc wear mcchanism was dctcrmined and it is affected by the die contact surface layer finished by electropolishing and the dies coated with thermal diffusion treatment was the most resistant condition to the wear process due to the presence of V andNb carbonitrures

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