Copper powder extrusion: A smart processing for energy and environment conservation
Conference proceedings article
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Publication Details
Author list: Wichianrak R., Thavarungkul N., Poolthong N., Tongsri R.
Publisher: Trans Tech Publications
Publication year: 2008
Volume number: 55-57
Start page: 361
End page: 364
Number of pages: 4
ISBN: 9780878493562
ISSN: 1022-6680
Languages: English-Great Britain (EN-GB)
Abstract
Cu powder extrusion developed in this work is aimed to be a pilot processing technique to plausibly replace conventional metal extrusion, which is higher in energy consumption and hence causes negative environment impact. In this study, both spherical- and irregular-shape Cu powders were used. 5 different binder formulae comprising low density polyethylene (LDPE); paraffin wax; and stearic acid of 25:70:5, 30:65:5, 35:60:5, 40:55:5 and 45:50:5 by weight were studied. Wettability between the binders and Cu powder of all formulae observed by naked eye appeared to be satisfactory. The binders were then mixed with 60% by volume of Cu powder. Rheological properties, observed using a capillary rheometer with 2 mm diameter orifice at 95ฐC, determined that the last 2 formulae gave sufficient green strength in the extrudate. However, only the latter binder formula gave extrudate with smooth surface. Downward extrusion with 45 cm distance from the die gave straight extrudates and no any distortion or warpage was found. Solvent debinding conditions using hexane at 40, 50 and 60ฐC were studied. The debinding at 50ฐC was the most effective in dissolving the binder and ensured that the Cu powder remained intact. The 15 cm-long Cu extrudates were sintered in H2 atmosphere at 1030ฐC for different times. Density and tensile strength of the sintered extrudates were determined. ฉ 2008 Trans Tech Publications, Switzerland.
Keywords
Copper powder extrusion, Debinding, Feedstock, Pseudo-plastic, Sintered properties
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