Dielectric properties and 3d printing of uv-cured acrylic composite with alumina microfiller

3D printing has potential to provide various solid insulating material such as a functionally graded material. It has not been clarified if the polymer-ceramic composite, the basic structure for the solid insulating material, can be 3D-printed even when the large amount of insulating ceramics fillers are introduced. This paper investigated the feasibility of the stereolithographic 3D printing of an insulating component using a UV-cured acrylic composite with a micorometric alumina fillers (alumina/UV-cured acrylic composite). Since scattering and absorption of UV light by alumina fillers were potential obstacle to UV curing, the UV light transmission characteristics of the alumina/UV-cured acrylic composite were obtained. The result provides the evidence that UV light reaches the back side of the layer of the composite and the resin is cured. As basic dielectric properties, permittivity and loss tangent of the alumina/UV-cured acrylic composites were obtained. It was confirmed that the permittivity of the composites was in accordance with the formulas for permittivity of two-component composite. By using the composite material, a 3D model of the conical insulating spacer was designed with physics simulation software and the data was printed out.

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