Avaliação teórica de rota alternativa para obtenção de suspensões aquosas de alumina-zircônia

Abstract

The development of ceramic composites with high mechanical strength and chemical stability has gained increasing attention, particularly in the alumina–zirconia system, due to the combination of properties such as high hardness, fracture toughness, and biocompatibility. The present study provides a detailed literature review on the stability and rheological behavior of aqueous alumina–zirconia composite suspensions intended for tape casting processing. This review aimed to present a comparative discussion between the traditional route for obtaining such suspensions—based on mixing all components in a single step—and an alternative route, which involves the individual preparation of stabilized alumina (Al₂O₃) and zirconia (ZrO₂) suspensions, followed by a controlled mixing stage. Through an in-depth analysis of reported micrographs, zeta potential data, and rheological properties, it was observed that the alternative route proves to be more efficient for obtaining stable aqueous suspensions, despite being scarcely explored in the literature.