Preparation of Cu-Al2O3 Composite Material by Mechanical Alloying
| Autor: | Jin-Zhong Chen, 陳進忠 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Pure Cu powder and alumina powder are used for preparing Cu-3wt.%Al2O3 oxide dispersion strengthen（ODS）composite powders through mechanical alloying（MA）method. Fixed rotation speed of ball mill, BPR and temperature, milling time as the variety unit. The evolution of microstructure change and composite powder morphology are analyzed by XRD, SEM, EDS and Laser light scattering particle size analyzer. Cu oxides are formed during Cu powder preparation where open environment. The microstructure of powder changes the milling time with decreases. Uniformly mixed Cu-3wt.%Al2O3 oxide dispersion strengthened composite powder is obtained with BPR 80 at 30℃and rotating speed 600rpm for attrition milling 10hr, then undergoing reduced heat treatment can improve the oxidation and reducing the Cu oxide effectively. 10 hr milled composite powder is then hot pressed of uniaxial to form bulk, and observe how the parameters of hot pressing influence on material. The result shows that the hot pressing time influence on material is relatively small, but the hot pressing pressure and temperature are relatively high, as the hot pressing pressure and temperature increase, the density、hardness and electrical conductivity also increase, but the hardness will decrease when temperature is too high. The composite powder after proceeding hydrogen reduction is more advantageous for sintering and has much better mechanical properties than using unreduced powders and pure copper. The content of oxide also affects the electrical and mechanical properties of Cu base composite material. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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