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Effect of ball-milling time on structural characteristics and densification behavior of W-Cu composite powder produced from WO3-CuO powder mixtures

Title
Effect of ball-milling time on structural characteristics and densification behavior of W-Cu composite powder produced from WO3-CuO powder mixtures
Author
김영도
Keywords
Mechano-chemical process; W-Cu; Raw materials; Solid phase sintering; Liquid phase sintering
Issue Date
2017-06
Publisher
ELSEVIER SCI LTD
Citation
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, v. 65, page. 39-44
Abstract
Understanding the microstructure of W-Cu nanocomposite powder is essential for elucidating its sintering mechanism. In this study, the effect of milling time on the structural characteristics and densification behavior of W-Cu composite powders synthesized from WO3-CuO powder mixtures was investigated. The mixture of WO3 and CuO powders was ball-milled in a bead mill for 1 h and 10 h followed by reduction by heat-treating the mixture at 800 degrees C in H-2 atmosphere with a heating rate of 2 degrees C/min to produce W-Cu composite powder. The microstructure analysis of the reduced powder obtained by milling for 1 h revealed the formation of W-Cu powder consisting of W nanoparticle-attached Cu microparticles. However, Cu-coated W nanocomposite powder consisting of W nanoparticles coated with a Cu layer was formed when the Mixture was milled for 10 h. Cu-coated W nanopowder exhibited an excellent sinterability not only in the solid-phase sintering stage (SPS) but also in the liquid-phase sintering stage (LPS). A high relative sintered density of 96.0% was obtained at 1050 degrees C with a full densification occurring on sintering the sample at 1100 degrees C. The 1 h-milled W-Cu powder exhibited a high sinterability only in the LPS stage to achieve a nearly full densification at 1200 degrees C. (C) 2016 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/abs/pii/S0263436816304280?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/114545
ISSN
0263-4368
DOI
10.1016/j.ijrmhm.2016.11.012
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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