Sintering Behavior, Thermal Expansion, and Environmental Impacts Accompanying Materials of the Al2O3/ZrO2 System Fabricated via Slip Casting

Abstract

This work focuses on research on obtaining and characterizing Al2O3/ZrO2 materials formed via slip casting method. The main emphasis in the research was placed on environmental aspects and those related to the practical use of ceramic materials. The goal was to analyze the environmental loads associated with the manufacturing of Al2O3/ZrO2 composites, as well as to determine the coefficient of thermal expansion of the obtained materials, classified as technical ceramics. This parameter is crucial in terms of their practical applications in high-temperature working conditions, e.g., as parts of industrial machines. The study reports on the four series of Al2O3/ZrO2 materials differing in the volume content of ZrO2. The sintering process was preceded by thermogravimetric measurements. The fabricated and sintered materials were characterized by dilatometric study, scanning electron microscopy, X-ray diffraction, and stereological analysis. Further, life cycle assessment was supplied. Based on dilatometric tests, it was observed that Al2O3/ZrO2 composites show a higher coefficient of thermal expansion than that resulting from the content of individual phases. The results of the life cycle analysis showed that the environmental loads (carbon footprint) resulting from the acquisition and processing of raw materials necessary for the production of sinters from Al2O3 and ZrO2 are comparable to those associated with the production of plastic products such as polypropylene or polyvinyl chloride.

Low-Cost Antibacterial Ceramic Water Filters for Decentralized Water Treatment: Advances and Practical Applications

“…However, slip casting is the most commonly used method due to its simplicity and ability to produce filters with consistent porosity and particle retention properties . Extrusion and hand-molding methods are typically used for small-scale production or when specific filter geometries are required …”

“… 25 Extrusion and hand-molding methods are typically used for small-scale production or when specific filter geometries are required. 26 …”

“…25 Extrusion and hand-molding methods are typically used for small-scale production or when specific filter geometries are required. 26 The process of slip casting begins with the deposition of the ceramic slip into a specifically tailored mold, where it is allowed to solidify over a designated time frame. The mold's walls absorb the surplus moisture, thereby expediting the solidification of the slip.…”