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Effect of Melting Temperature and Injection Speed on Microstructure of ABS + 20 wt%PC/Al Flake M talized Plastics

Department of Mechanical & Electro-mechanical Engineering Tamkang University, Tamsui, Taipei County, R.O.C, cblin{at}mail.tku.edu.tw

Chi-Yuan Feng

Department of Mechanical & Electro-mechanical Engineering Tamkang University, Tamsui, Taipei County, R.O.C

Hung-Chou Lee

Department of Mechanical & Electro-mechanical Engineering Tamkang University, Tamsui, Taipei County, R.O.C

Z.C. Chang

Department of Mechanical Engineering National, Chin-Yi Institute of Technology, Taiping City, Taichung County, R.O.C

This research discusses the effect of melt temperature (200, 240, and 270°C) and injection speed (18, 25, and 35%) on orientation distribution and weight fraction of aluminum flakes in ABS+20wt%PC plates. Aluminum flake's aspect ratio increases with melt temperature but is not influenced by injection speed. The weight fraction of aluminum flakes is higher in the core layer than in the surface layer but is not influenced by injection speed. Conversely, the weight fraction of aluminum flakes in the surface layer is inversely proportional to both injection speed and melt temperature. For molds with long flow path from a single-point sprue, aluminum flakes tend to congregate into piles in the surface layer, and the weight fraction of aluminum flakes decreases with increasing injection distance. Aluminum flakes are oriented randomly on the outer side of the bolt hole, but along the direction of flow on the inner side of the bolt hole.

Key Words: aluminum flakes • melt temperature • microstructure • injection speed • aspect ratio.

Journal of Thermoplastic Composite Materials, Vol. 21, No. 5, 375-392 (2008)
DOI: 10.1177/0892705708089482


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