Effect of Powder Characteristic on Al Internal Oxidation to Prepare Al2O3- Cu Composite

Abstract

Effects of powder characteristics on the internal oxidation of Cu-Al prealloyed powders were discussed. The results show that the internal oxidation of Al was occurred during sintering not in ball milling when the content of Al in Cu-Al prealloyed powders was 0.8wt.%, the mechanism of Al internal oxidation was different with the milling time, when the milling time was short, the internal oxidation of Al during sintering were mainly the unsolved Al and absolute Cu-Al solid solution resulted in coarse Al2O3 and fine Al2O3 particles respectively. When the mixed powders were milling for time long enough, the internal oxidation of Al during sintering was all the metastable Cu-Al prealloyed. A good quality Al2O3-Cu composite was prepared. The Al2O3 particles with an average size 2-5 mm in diameter and about 5-10 mm in particle spacing have been observed uniformly dispersed in the composite prepared by prealloyed powders after milling 96 h.

Keywords

high energy milling internal oxidation powders characteristic Al2O3-Cu composite

Get full access to this article

View all access options for this article.

References

1. Joanna Groza (1992). Heat-Resistant Dispersion-Strengthened Copper Alloys, Journal of Materials Engineering and Performance, 1(1): 113-121.

2. Ferro, A.C. , Caldas, M.P. and Correia J.B. (1995). Grain Boundary Alumina Precipitation During Internal Oxidation of Cu-Al Water Atomized Powders, Materials Science Forum, 2(6): 207-209.

3. Shuhua, Liang and Zhikang, Fan (1999). Al2O3 Particle Reinforced Copper Matrix Composite Using for Continuous Casting Mould, Acta Metallurgica Sinica, 12(5): 782-787.

4. Samal, P.K. (1984). Dispersion Strengthened Copper, Metal Powder Report, 39(10): 587-589.

5. Ying, D.Y. and Zhang, D.L. (2000). Processing of Cu-Al2O3 Metal Matrix Nanocomposite Materials by Using High Energy Ball Milling, Materials Science and Engineering A, 286:152-156.

6. Lee, D.W. , Ha, G.H. and Kim, B.K. (2001). Synthesis of Cu-Al2O3 Nano Composite Powder, Scripta Mater., 44: 2137-2140.

7. Lei, Xu (2002). A Study on the Microstructure and Property of Cu-Al2O3 Composite Prepared by a New Type Vacuum Internal Oxidation Technique, Masters Degree Paper of Xi’an University of Technology, 3: 13-65.