The Effect Of The Amount Of Process Control
Agent On The Properties Of Cu25W Composite
Powder
Author(s)
S. Biyik & M. Aydin
Abstract
This study is based upon the optimization of production parameters of Cu25W
electrical contact material. Commercial elemental copper (Cu) and tungsten (W)
powders were synthesized to produce Cu25W composite powder by mechanical
alloying technique at various amounts of stearic acid via using a planetary type
ball mill. The effect of amount of stearic acid on production of Cu25W
composite powder was evaluated. In order to achieve true alloying among
powder particles, it is necessary to establish a balance between cold welding and
fracturing. Hence, different types of process control agents (PCA) were used to
reduce excessive cold welding. Here, the effect of various amounts of stearic
acid, namely 0, 0.5, 1, 2 and 3 wt.% on morphology and some properties of
Cu25W composite powder were studied. The microstructural evolution of the
milled powders was characterized by using scanning electron microscopy.
The test results showed that the morphology and particle size distribution of the
milled powders were changed considerably depending upon the variable amount
of PCA. In addition, holding the same milling duration, different microhardness
values were obtained for various amounts of PCA.
Keywords: composite powders, copper matrix composites, electrical contact
materials, mechanical alloying, process control agent, tungsten.
Keywords
composite powders, copper matrix composites, electrical contact
materials, mechanical alloying, process control agent, tungsten.
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