Science of Sintering 2016 Volume 48, Issue 1, Pages: 71-79
https://doi.org/10.2298/SOS1601071H
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Cold compaction behavior and pressureless sinterability of ball milled WC and WC/Cu powders
Hashemi Seyed R. (Islamic Azad University, Department of Materials Engineering, Science and Research Branch, Tehran, Iran)
Ardestani Mohammed (Islamic Azad University, Department of Materials Engineering, Science and Research Branch, Tehran, Iran)
Nemati Ali (Sharif University of Technology, Department of Materials Science and Engineering, Tehran, Iran)
In this research, cold compaction behavior and pressureless sinterability of
WC, WC-10%wtCu and WC-30%wtCu powders were investigated. WC and WC/Cu powders
were milled in a planetary ball mill for 20h. The milled powders were cold
compacted at 100, 200, 300 and 400 MPa pressures. The compressibility
behavior of the powders was evaluated using the Heckel, Panelli-Ambrosio and
Ge models. The results showed that the Panelli-Ambrosio was the preferred
equation for description the cold compaction behavior of the milled WC and
WC-30%wtCu powders. Also, the most accurate model for describing the
compressibility of WC-10%wtCu powders was the Heckel equation. The cold
compacts were sintered at 1400°C. It was found that by increasing the cold
compaction pressure of powder compacts before sintering, the sinterability of
WC-30%wtCu powder compacts was enhanced. However, the cold compaction
magnitude was not affected significantly on the sinterability of WC and
WC-10%wtCu powders. The microstructural investigations of the sintered
samples by Scanning Electron Microscopy (SEM) confirmed the presence of
porosities at the interface of copper-tungsten carbide phases.
Keywords: WC-Cu composites, compressibility behavior, sintering