article · International Journal of Applied Ceramic Technology
This research investigated the influence of magnesium oxide (MgO) content on zirconia-toughened alumina (ZTA) ceramic slurries used in Vat photopolymerisation 3D printing. The study aimed to mitigate mechanical anisotropy in complex ceramic components. It found that adding 0.75 vol% MgO significantly improved the layered structure and surface precision of fabricated ceramic gears. This specific MgO content also optimised flexural strength, fracture toughness, microhardness, and density. The improvements were attributed to the formation of MgAl₂O₄ at grain boundaries, which enhanced strength and prevented abnormal grain growth. The findings provide foundational data for creating high-performance ZTA ceramic parts.
Improving the mechanical properties and precision of 3D printed ceramic components is crucial for developing advanced materials. This research offers a method to create stronger, more reliable ceramic parts, which are essential for applications requiring high performance and durability in challenging environments.
This early-stage research provides foundational data for fabricating high-performance zirconia-toughened alumina ceramic parts. The findings could enable the development of more precise and mechanically robust ceramic components, such as gears, for various industrial applications. Potential users include manufacturers of advanced machinery, aerospace components, or medical devices requiring durable, high-strength ceramic materials.
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Abstract Complex ceramic components fabricated using the Vat photopolymerization ceramic 3D printing technology (VPP) exhibit mechanical anisotropy both within and between the printed layers. To address this issue, the effects of different MgO vol% on the self‐leveling properties, green body forming characteristics, microstructure of the sintered bodies, and mechanical properties of ZTA ceramic slurries were investigated. The results indicate that the layered structure of the ceramic component significantly improved with the addition of 0.75 vol% MgO. The fabricated MgO–ZTA ceramic gear exhibited high surface precision, while MgO enhanced the diffusion coefficient of Al₂O₃. The results showed that the optimized matching of flexural strength (454 MPa), fracture toughness (6.97 Mpa·m 1/2 ), microhardness (2568 HV), and density (3.975 g·cm⁻ 3 ) was acquired by ZTA ceramic with a MgO content of 0.75 vol%.The reaction at the grain boundaries produced MgAl₂O₄, which improved boundary strength and prevented abnormal grain growth through a pinning effect, thereby enhancing the mechanical properties of the ceramic components. An appropriate amount of MgO not only reduced the uneven distribution of ceramic particles during 3D printing but also improved the surface precision and mechanical properties of the ceramic components. The research results provide foundational data for the fabrication of high‐performance ZTA ceramic parts.
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DOI: 10.1111/ijac.15034
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