Abstract

In our study, we investigated the additive manufacturing (AM) of ceramic-based functionally graded materials (FGM) by the direct AM technology thermoplastic 3D printing (T3DP). Zirconia components with varying microstructures were additively manufactured by using thermoplastic suspensions with different contents of pore-forming agents (PFA), which were co-sintered defect-free. Different materials were investigated concerning their suitability as PFA for the T3DP process. Diverse zirconia-based suspensions were prepared and used for the AM of single- and multi-material test components. All of the samples were sintered defect-free, and in the end, we could realize a brick wall-like component consisting of dense (<1% porosity) and porous (approx. 5% porosity) zirconia areas to combine different properties in one component. T3DP opens the door to the AM of further ceramic-based 4D components, such as multi-color, multi-material, or especially, multi-functional components.

Highlights

  • The term “4D printing” was initially used by Tibbits and Sheil [1] and describes a technology that was developed through a collaboration between The Self-Assembly Lab, Stratasys, and Autodesk to manufacture customizable smart materials

  • We investigated the additive manufacturing (AM) of ceramic-based functionally graded materials (FGM) by thermoplastic 3D printing (T3DP), which is a direct AM technology

  • We showed that it is possible to combine AM and FGM to create zirconia-based

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Summary

Introduction

The term “4D printing” was initially used by Tibbits and Sheil [1] and describes a technology that was developed through a collaboration between The Self-Assembly Lab, Stratasys, and Autodesk to manufacture customizable smart materials. By using an additive manufacturing (AM) device, polymer multi-material components with the added capability of shape transformation from one state to another can be realized. This offers the possibility to include functionalities such as actuation, sensing, and material logic directly into the components [2]. Manufactured multi-material components can transform from any 1D strand or 2D surface into a 3D shape, or morph from one 3D shape into another.

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