Effects of some Parameters on Properties of Cu-Al₂O₃ Composite Materials Synthesized by Internal Oxidation Process

Abstract:

The Cu-Al₂O₃ composite materials applying for electrode materials were successfully synthesized by internal oxidation process. The process included steps: producing solid solution α-Cu[Al] and oxidizing completely solid solution α-Cu[Al] as powders, then adding pure Cu powders and mixing in planetary ball milling, the mixtures were compressed into cylindrical samples, reduced at 750°C in 3h and sintered at 950°C in 2h in reduction atmosphere. The XRD patterns showed that total Al in Cu-matrix were completely oxidized in range of 20¸25h. After reducing and sintering process, the final products were Cu-Al₂O₃ composite materials. The results showed that micro-hardness, porosity and compress strength of Cu-Al₂O₃ materials increased with increasing of Al₂O₃ content, which was the result of dispersion of the fined Al₂O₃ grains in Cu-matrix. When Al₂O₃ content was unchanged, the porosity of received materials decreased with increasing of compress pressure. Whereas, the electrical conductivity of Cu-Al₂O₃ composite materials decreased comparing with pure Cu and it decreased with increasing of Al₂O₃ content.

• Periodical: Applied Mechanics and Materials (Volume 889)
• Pages: 38-42
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.889.38
• Online since: March 2019
• Authors: Ho Ky Thanh*, Duc Duy Nguyen
• Keywords: Composite Materials, Dispersion, Electrical Conductivity, Internal Oxidation

References

[1] Ziyuan Shi, Maofang Yan; The preparation of Al2O3–Cu composite by internal oxidation; 1998, vol. 134, Issues 1–4, pp.103-106.

DOI: 10.1016/s0169-4332(98)00223-2

[2] Li Guobin, Sun Jibing, Guo Quanmei, Wang Ru; Fabrication of the nanometer Al2O3/Cu composite by internal oxidation; Journal of Materials Processing Technology, 2005, vol.170, p.336–340.

DOI: 10.1016/j.jmatprotec.2005.05.011

[3] Viseslava Rajkovic, Dusan Bozic, Milan T. Jovanovic; Effects of copper and Al2O3 particles on characteristics of Cu–Al2O3 composites; Materials and Design, 2010, vol.31, p.1962–(1970).

DOI: 10.1016/j.matdes.2009.10.037

[4] J.H. Kim, J.H. Yun, Y.H. Park, K.M. Cho, I.D. Choi, I.M. Park; Manufacturing of Cu-TiB2 composites by turbulent in situ mixing process; Materials Science and Engineering A 449–451, 2007, p.1018–1021.

DOI: 10.1016/j.msea.2006.02.302

[5] S. Islak, D. Kir, S. Buytoz; Effect of Sintering Temperature on Electrical and Microstructure Properties of Hot Pressed Cu-TiC Composites; Science of Sintering 46, 2014, p.15–21.

DOI: 10.2298/sos1401015i

[6] Seung J. Hwang, Jin-hyung Lee; Mechanochemical synthesis of Cu–Al2O3 nanocomposites; Materials Science and Engineering A 405, 2005, p.140–146.

DOI: 10.1016/j.msea.2005.05.077