Abstract
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.
Highlights
The composite materials which are used in electrical industries are made of an excellent thermal and electrical conductive matrix phase like silver or copper and a wear resistant hard reinforcement such as tungsten or tungsten carbide
The sintering temperature of the cold compacts depends on the volume fraction and melting temperature of the constituent with lower melting point
WC, WC-10%wtCu and WC-30%wtCu powder batches were milled in a planetary ball mill at the milling speed of 400rpm for 20h in argon atmosphere
Summary
The composite materials which are used in electrical industries are made of an excellent thermal and electrical conductive matrix phase like silver or copper and a wear resistant hard reinforcement such as tungsten or tungsten carbide. Infiltration does not result in a homogeneous microstructure and is not a net shape process [3,4] Another technique which is applied as the production process is included mixing, cold compaction and sintering the starting powders. It was shown that the sinterability of the powders was enhanced significantly by using composite powders instead of the mixture ones [6] Several methods like such as ball milling [7,8], thermochemical [9]
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