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- Characteristics of WO3-CuO Powder Mixture Prepared by High-Energy Ball Milling in a Bead Mill for the Synthesis of W-Cu Nanocomposite Powder
- Hae-Ryong Park, Sung-Soo Ryu
- J Korean Powder Metall Inst. 2017;24(5):406-413. Published online October 1, 2017
- DOI: https://doi.org/10.4150/KPMI.2017.24.5.406
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Abstract
PDF A Nanosized WO3 and CuO powder mixture is prepared using novel high-energy ball milling in a bead mill to obtain a W-Cu nanocomposite powder, and the effect of milling time on the structural characteristics of WO3-CuO powder mixtures is investigated. The results show that the ball-milled WO3-CuO powder mixture reaches at steady state after 10 h milling, characterized by the uniform and narrow particle size distribution with primary crystalline sizes below 50 nm, a specific surface area of 37 m2/g, and powder mean particle size (D50) of 0.57 μm. The WO3-CuO powder mixtures milled for 10 h are heat-treated at different temperatures in H2 atmosphere to produce W-Cu powder. The XRD results shows that both the WO3 and CuO phases can be reduced to W and Cu phases at temperatures over 700°C. The reduced W-Cu nanocomposite powder exhibits excellent sinterability, and the ultrafine W-Cu composite can be obtained by the Cu liquid phase sintering process.
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Citations
Citations to this article as recorded by
- Morphological Characteristics of W/Cu Composite Nanoparticles with Complex Phase Structure Synthesized via Reactive Radio Frequency (RF) Thermal Plasma
Chulwoong Han, Song-Yi Kim, Soobin Kim, Ji-Woon Lee
Metals.2024; 14(9): 1070. CrossRef
- Morphological Characteristics of W/Cu Composite Nanoparticles with Complex Phase Structure Synthesized via Reactive Radio Frequency (RF) Thermal Plasma
- Densification and Microstructure of Ultrafine-sized AlN Powder Prepared by a High Energy Ball Milling Process
- Hae-Ryong Park, Young-Do Kim, Sung-Soo Ryu
- J Korean Powder Metall Inst. 2012;19(1):25-31.
- DOI: https://doi.org/10.4150/KPMI.2012.19.1.025
- 91 View
- 2 Download
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Abstract
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- In this study, a high energy ball milling process was employed in order to improve the densification of direct nitrided AlN powder. The densification behavior and the sintered microstructure of the milled AlN powder were investigated. Mixture of AlN powder doped with 5 wt.% Y_2O_3 as a sintering additive was pulverized and dispersed up to 50 min in a bead mill with very small ZrO_2 beads. Ultrafine AlN powder with a particle size of 600 nm and a specific surface area of 9.54 m2/g was prepared after milling for 50 min. The milled powders were pressureless-sintered at 1700°C-1800°C for 4 h under N_2 atmosphere. This powder showed excellent sinterability leading to full densification after sintering at 1700°C for 4 h. However, the sintered microstructure revealed that the fraction of yitttium aluminate increased with milling time and sintering temperature and the newly-secondary phase of ZrN was observed due to the reaction of AlN with the ZrO_2 impurity.
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