The study of aluminothermic reduction in manganese compounds is a complex challenge in preparing Al-Mn alloys. The primary objective of this study was to ascertain the activation energy values for the aluminothermic reduction of MnO and Mn₃O₄ oxides derived from alkaline batteries. The study melted aluminum found in beverage cans and utilized the technique of powder addition with mechanical agitation. The kinetics of the reaction were studied under the effects of temperature (750, 800, and 850 °C), degree of agitation (200, 250, and 300 rpm), and the initial concentration of magnesium in molten aluminum (1, 2, 3, and 4% by weight). Kinetic measurements for Mn₃O₄ particles suggest a reaction mechanism that occurs in stages, where manganese undergoes oxidation states [Mn⁺³] to [Mn⁺²] until it reaches the oxidation state Mn⁰, which allows it to dissolve in the molten aluminum, forming alloys with up to 1.5 wt.% of Mn. Therefore, the kinetic of the aluminothermic reduction of MnO is described by the geometric contraction model, while the mechanism of Mn₃O₄ reduction occurs in two stages: geometric contraction, followed by an additional stage involving the diffusion of chemical species to the boundary layer. In addition, this stage can be considered a competition between the formation of MnO and the chemical reaction itself.

In this work, the Zn22Al4Ag alloy was synthesized by melting in a muffle furnace.The alloy obtained was characterized by Scanning Electron Microscopy Energy Dispersive Spectroscopy and was analyzed by the X-Ray Diffraction technique, where the crystallinity of the material was verified before and after being processed. Likewise, the Differential Scanning Calorimetry technique was used to obtain the temperatures where phase transformations occurin the alloy. These results were fed to the Termocalc®, software to numerically obtain the phase diagram of the alloy. Subsequently, a section of the ingot was taken to the rapid solidification process by rotating drum. The process variables were manipulated: jet stability, nozzle diameter, distance from the nozzle surface to the cooling medium, the delay time of the molten material in the crucible, speed of the rotating drum and jet angle, until obtaining a microwire with a diameter of ~ 160µm. Finally, it was determined that inadequate control of these parameters can result in powders, flakes or blockage of the crucible outlet. Potentially uses within the micro and nanoworld as an analogy to structural elements and electrical conductors, in addition to its current use as a coating anti-corrosive. Key Words: ZnAlAg alloy, Melt spinning process, Microwire, DSC analysis, Thermodynamic simulation En este trabajo se sintetizó la aleación Zn22Al4Ag mediante fusión en horno de mufla. La aleación obtenida se caracterizó mediante Espectroscopia de Dispersión de Energía por Microscopía Electrónica de Barrido y se analizó mediante la técnica de Difracción de Rayos-X, donde se verificó la cristalinidad del material antes y después de ser procesado. Asimismo, se utilizó la técnica de Calorimetría Diferencial de Barrido para obtener las temperaturas donde se producen las transformaciones de fase en la aleación. Estos resultados se introdujeron en el software Termocalc®, para obtener numéricamente el diagrama de fases de la aleación. Posteriormente, se llevó una sección del lingote al proceso de solidificación rápida mediante tambor rotativo. Se manipularon las variables del proceso: la estabilidad del chorro, el diámetro de la boquilla, la distancia de la superficie de la boquilla al medio de enfriamiento, el tiempo de residencia del material fundido en el crisol, la velocidad del tambor giratorio y el ángulo del chorro, hasta obtener un microalambre con un diámetro de 160µm. Por último, se determinó que un control inadecuado de estos parámetros puede dar lugar a polvos, escamas o al bloqueo de la salida del crisol. Su uso potencial dentro de la escala micro-nano como analogía a elementos estructurales y conductores eléctricos, además de su uso actual como recubrimiento anticorrosivo. Palabras Clave: ZnAlAg alloy, Melt spinning process, Microwire, DSC analysis, Thermodynamic simulation