Manufacture of a Micro 2D Pillar Array of Carbon Fibers for the Cilia Based Piezoelectric Actuator
A. Carrasco, P.P. Pott, H.F. Schlaak
Technische Universität Darmstadt, Darmstadt, Germany
Piezoelectric actuators accumulate microscopic vibrations from piezoelectric elements to achieve high-precision macroscopic movements . To do so, usually a friction contact is involved. In such cases, abrasion is a negative resulting effect, which directly influences the performance of the actuator.
The cilia based piezoelectric actuator  uses a high resilient friction layer of cilia to avoid abrasion and to achieve anisotropic friction. The cilia are carbon fibers arranged with a defined inclination (45°) for anisotropic friction and a defined fiber length (1.5 mm) into a 2D pillar array. To avoid fracturing of the fibers by interfiber-friction, the fibers are arranged with inter-fiber-space. This is achieved by embedding nickel coated fibers, straight and piled up, in a polymer matrix. The nickel coating serves as spacer between fibers. After milling off small matrices with the desired shape, one of their sides is activated with plasma and later glued to a stainless steel substrate. Then, the matrix and the nickel coating are sequentially and selectively removed by wet chemical procedures.
The resulting 2D array of carbon fibers leads to long fiber lifetime and free bending resulting from the interfiber-spaces. Thus, this array reaches the potential to be integrated into macroscopic actuation systems and can be scaled to different surfaces.
ACTUATOR 2014 Manuskript Poster 55
Publication date: 26/05/2015
Manuscript Poster 55 published in Conference Proceedings ACTUATOR 2014
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