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Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials VII Ceramic Engineering and Science Proceedings, Volume 34 Issue 8 von Ohji, Tatsuki (eBook)

  • Erscheinungsdatum: 02.12.2013
  • Verlag: Wiley-American Ceramic Society
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Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials VII

Ceramic Engineering and Science Proceedings Volume 34, Issue 8 - Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials VII A collection of 20 papers from The American Ceramic Society's 37th International Conference on Advanced Ceramics and Composites, held in Daytona Beach, Florida, January 27-February 1, 2013. This issue includes papers presented in the 7 th International Symposium on Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials and Systems (Symposium 8).

Produktinformationen

    Format: ePUB
    Kopierschutz: AdobeDRM
    Seitenzahl: 192
    Erscheinungsdatum: 02.12.2013
    Sprache: Englisch
    ISBN: 9781118807897
    Verlag: Wiley-American Ceramic Society
    Größe: 7403 kBytes
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Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials VII

CREATION OF SURFACE GEOMETRIC STRUCTURES BY THERMAL MICRO-LINES PATTERNING TECHNIQUES

Soshu Kirihara, Satoko Tasaki

Joining and Welding Research Institute
Osaka University
11-1 Mihogaoka Ibaraki, Osaka 567-0047, Japan

Yusuke Itakura

Graduate School of Engineering
Osaka University
2-1 Yamadaoka Suita, Osaka 565-0871, Japan
ABSTRACT

Thermal micro lines patterning techniques were newly developed as novel technologies to create geometrical intermetallics patterns for mechanical properties modulations of metal substrates. Pure copper particles were dispersed into the photo solidified liquid resins, and these slurries were spread on aluminum substrates. Micro patterns with fractal structures of Hilbert curves and dendritic lines were drawn and fixed by an ultra violet laser scanning. The formed patterns on the substrates were heated in an argon atmosphere, and the intermetallic or alloy phases with high hardness were created through reaction diffusions. The mechanical properties and surface stress distributions were measured and simulated by a tensile stress test and finite element method.
INTRODUCTION

Fractal geometries with self-similarity can be applied to modulate various flows in engineering fields [1,2]. Geometric networks with the fractal structure of intermetallic compounds patterned on light metals can strengthen whole materials efficiently by controlling surface stress distributions intentionally. In our research group, three dimensional metal and ceramics lattices with dendritic structures have been created and inserted into various matrices successfully to control stress and heat distributions [3,4]. Considering the next generation, mechanical properties enhancements by novel surface treatments will be expected to contribute novel materials processing of rare metals free. In this investigation, micro patterns composed of copper aluminide had been created on pure aluminum substrates by using a laser scanning stereolithography and a reaction diffusion joining. Microstructures and composite distributions in the vicinity of formed alloy and metal interfaces were observed and analyzed by using an electron microscope. Load dispersion abilities of the network were evaluated by using conventional mechanical tests and compared with simulated and visualized profiles by using a numerical analysis simulation.
EXPERIMENTAL PROCEDURE

Self-similar patterns of Hilbert curve with stage numbers 1, 2, 3 and 4 of the fractal line structures were designed by using a computer graphic application, and these graphic images were converted into the numerical data sets by computer software. These patterns of 25×25 mm in whole size were composed of arranged lines of 400 μm in width. These graphic models were transferred into the processing apparatus as operating data sets. Metal particles were patterned on a metal substrate by using a stereolithographic system. The pure copper particles of 50 μm in average diameter dispersed into a photo sensitive urethane resin at 60 volume percent. The mixed resin paste was spread with 100 μm in layer thickness on an aluminum substrate of 30×30×2 mm in size by using a mechanically moved knife edge as shown in Fig. 1 . An ultraviolet laser beam of 355 nm in wavelength and 100 μm in beam spot was scanned on the resin surface according to the computer operation. A two dimensional solid pattern was obtained by a light induced photo polymerization. Figure 2 shows the appearance of the stereolithographic system. Subsequently, the dendiritic fractal patterns with the self-similarity of stage number 3 were adopted as the geometrical patterns. The patterns of 20×80 mm in whole size were composed of arranged lines of 400 and 8000 μm in width and length. The mixed resin paste with the pure copper particles was patterned on the aluminum specimen o

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