Effects of Sintering and Compress on Porosity, Mechanical Properties and Conductivity of Cu-Al₂O₃ Composite Materials Fabricated by Mechano-Chemical Method

Abstract:

Nano Al₂O₃ dispersion - strengthened Cu-matrix composite materials were fabricated by mechano-chemical method. The method carries out at room temperature by mechanical milling in the attritor in 16h hours using the mixtures of CuO, Al and Cu powder ingredients, and then the mixtures were cold pressed into cylindrical samples and sintered at various temperatures (from 700°C to 900°C) and time (from 1 to 3 hours) in argon atmosphere. The XRD pattern and EDS results revealed that Al₂O₃ phases were formed and dispersed into Cu-matrix during mechano-chemical process. The Al peak disapeared at the end of mechano-chemical process and the final obtained products were Cu-Al₂O₃ composite materials with Al₂O₃ content of 3-10% volume. The SEM and EDS results also showed that the particle sizes of Al₂O₃ were in about (50÷100)nm and uniformly dispersed within the C-matrix. The porosity of materials strongly depends on pressure compress, sintering time and temperature. It decreases with increasing of these parameters and reaches about 5%. The porosity and Al₂O₃ content affected on mechanical properties of materials, such as micro-hardness and compress strength, due to the dispersion of nano-Al₂O₃ into Cu-matrix. The conductivity of materials decreases with increasing porosity and Al₂O₃ content.

• Periodical: Applied Mechanics and Materials (Volume 889)
• Pages: 33-37
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.889.33
• Online since: March 2019
• Authors: Ho Ky Thanh*, Duc Duy Nguyen, Tran Van Dung
• Keywords: Conductivity, Cu-Matrix Composite, Dispersion, Mechano-Chemical Process, Porosity

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