Pore Structure Analysis of Large Size Gasar Cu Ingot Prepared by Bridgman Method

Abstract:

Large size Gasar ingots have the advantage of cost saving and productivity improvement, while little attention has been paid to the preparation of large size ingots, especially those with high structural quality. Bridgman method was introduced to fabricate large size Gasar metal ingot. High quality Gasar Cu cylinder sample of 150 mm in diameter and about 200 mm in height (weighing about 20 kg) was obtained at a proper withdrawing velocity. Pore structure distribution at different heights and radii in the sample was measured and analyzed in detail using the image analyzing software. The results showed that the pore aspect ratio changed slightly along the sample height. All the other structure parameters including porosity, penetrative porosity, penetrative pore area and number ratio, pore diameter, pore length and the pore aspect ratio kept almost constant at heights of over 65 mm, while they all varied little along the sample radius. Most of the pores were straight and round. The results suggested that Bridgman method was feasible for the fabrication of large size high quality Gasar metal ingots. This would promote the commercial application of Gasar metals, such as Gasar Cu for micro-channel heat sinks.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 1266-1275
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.1266
• Online since: June 2017
• Authors: Yun He*, Yan Xiang Li, Hua Wei Zhang, Yuan Liu
• Keywords: Bridgman Method, Directional Solidification, Gasar, Porous Metal

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