Fabrication of Al/Al<sub>2</sub>O<sub>3</sub> composite by powder metallurgy method from aluminum and rice husk ash

Authors

  • Chinawad Dhadsanadhep Faculty of Engineering Chulalongkorn University
  • Tachai Luangvaranunt Faculty of Engineering Chulalongkorn University
  • Junko Umeda Joining and Welding Research Institute, Osaka University
  • Katsuyoshi Kondoh Joining and Welding Research Institute, Osaka University

Abstract

Fabrication of Al-4wt.%Cu /Alumina composite was reported. The method of fabrication was powder metallurgy by in-situ reaction to form alumina during fabrication. Starting materials were mixture of aluminum, copper, and silica powders. Silica is in form of rice husk ash. The mixture was cold compacted, and sintered at 650°C for 1 h. Hot forging was carried out to further consolidate the sintered billet, followed by 10-h heat treatment at temperatures between 590 to 650°C. Phase analysis by XRD confirmed that in-situ reaction between silica and aluminum powders occurred during heat treatment at temperatures above 590°C. The products of reaction were silicon and gamma-alumina. Microstructure investigation showed that the reacted areas were the previous locations of silica powder. In some areas, remaining silica was found amid reaction products. Hardness of the fabricated composite made of Al-4wt.%Cu and 5, 10 and 15vol% silica are 16, 23, and 30 HRA, respectively.

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References

Liu, W. and Koster, U. 1996. Microstructure and properties of interpenetrating alumina/ aluminium composites made by reaction of SiO2 glass preforms with molten aluminum. Mater. Sci. Eng. 210 : 1-7.

Yoshikawa, N., Hattori, A. and Taniguchi, S. 2003. Growth rates and microstructures of reacted layers between molten Al-Fe alloy and SiO2. Mater. Sci. Eng. 342 : 51-57.

Li, J.Q. and Xiao, P. 2002. Joining alumina using an alumina/metal composite. J. Eur. Ceram. Society, 22 : 1225-1233.

Luangvaranunt, T., Jearwun, S. and Kondoh, K. 2007. Removal of adsorbed moisture on iron powders by rice husk ash. J. Met. Mater. Miner. 17(1) : 47-52.

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Published

2017-04-23

How to Cite

[1]
C. Dhadsanadhep, T. Luangvaranunt, J. Umeda, and K. Kondoh, “Fabrication of Al/Al<sub>2</sub>O<sub>3</sub> composite by powder metallurgy method from aluminum and rice husk ash”, J Met Mater Miner, vol. 18, no. 2, Apr. 2017.

Issue

Vol. 18 No. 2 (2008)

Section

Original Research Articles

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