Abstract
In order to improve the process of co-reduction of oxide powder, a new thermo-mechanical method was designed to produce high-dispersed W-Cu composite powder by high temperature oxidation, short time high-energy milling and reduction. The properties of W-Cu composite powder are analyzed in terms of oxygen contents, BET specific surface (BET-S), particle size distributions, morphology of final powder and their sintering behaviors. The results show that the oxygen content of W-Cu composite powder decreases with the increase of milling time, while the BET-S of final powder increases with the milling time. The distributions of final powder are more uniform after reduction at 630 °C than at 700 °C. After milling of the oxide powder for about 3-10 h, W-Cu composite powder with very low oxygen content can be achieved at the reduction temperature of 630 °C owning to the increasing of BET-S of W-Cu oxide powder. The particle size of W-Cu powder after reduction is lower than 0. 5 μm and smaller than that reduced at 700 °C. After sintering at 1200 °C for 60 min, the relative density and thermal conductivity of final products (W-20Cu) can attain 99.5% and 210 Wm-1K-1 respectively.
Original language | English |
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Pages (from-to) | 259-264 |
Number of pages | 6 |
Journal | International Journal of Refractory Metals and Hard Materials |
Volume | 21 |
Issue number | 5-6 |
DOIs | |
Publication status | Published - 2003 Sep |
Externally published | Yes |
Keywords
- Relative density
- Thermal conductivity
- Thermo-mechanical method
- W-Cu composite
ASJC Scopus subject areas
- Ceramics and Composites
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry