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A New 3D Shaped, Monolith PZT Beam Actuator Produced by Ceramic Injection Molding
Keywords: lead-zirconate-titanate (PZT), ceramic injection molding (CIM), beam actuator
A monolith piezoelectric beam actuator has been produced by ceramic injection molding (CIM). Usually piezoelectric beams actuators are realized by gluing two thin piezo ceramics with different expansion coefficients. This technology is quite complex and cost intensive and the actuators are not shock-resistant. The goal of this study was to manufacture a real 3D beam actuator made of one solid element, in only one forming process. There for a non constant cross section in thickness direction was used to transform the material strain into an actuator motion. Different actuator thickness ratios have been simulated to optimize the degree of efficiency. How ever the final monolith PZT beam actuator is robust against shock witch was reached by having a high geometrical moment of inertia excited to the thickness ratios. Big advantages of the ceramic injection molding process are more freedom of design lead-zirconate-titanate (PZT) actuators and sensors with new functional structures and the possibility for low budget mass production. Only with this technology real 3D PZT elements can be formed with a constant density. To achieve these goals, many researches into material behaviour, especially shrinking caused by debinding and sintering of the ceramic feedstock, have been done. These technical expertises were used for the final design of the injection molding tool and forming process. Another focus was put on deriving the piezoelectric properties of the final product. Because of using a mixed compound piezoelectric ceramic powder with addition of a thermoplastic binder system as injection molding aid, the properties of the finally polarized PZT are equivalent to other processing technologies like dry pressing, thick film etc. The CIM principle is used to form special structures (e.g. beams, membranes) with a 3D shape surface. Therefore the main focus is on deriving precision and optimisation for low cost mass production.
Matthias Hartmann, Dipl.-Ing.
University of Magdeburg (IMOS)
Magdeburg, Sachsen-Anhalt 39016,
Germany


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