Effect of Tungsten Powder Granularity on Hardness and Conductivity (1/2)

Different granularity of tungsten powder has different influences on the comprehensive properties of tungsten copper electrode, such as the hardness, the density, the electrical conductivity and micro-structure and so on. Here we highlight the impact of tungsten powder particle size on copper tungsten alloy electrode hardness and conductivity.

Take W-30Cu tungsten copper electrode as an example, the impact of tungsten powder (W) on the hardness and the electrical conductivity of W-30Cu tungsten copper electrode as follow:

From the figure we change the law, we can see a line of two, one of which is W-30Cu tungsten copper alloy electrode Brinell hardness (HB) changes with tungsten powder particle size curve, and the other is the conductance W-30Cu tungsten copper alloy electrode the rate of change with the tungsten powder particle granularity curve. With the tungsten powder particle size is increased by a 2.9μm to 11-13μm, the conductivity upward trend, while the hardness decreased gradually. Effect of tungsten copper alloy electrode hardness factor not only density, but also the grain granularity.

Due to tungsten (W) is the solid phase in tungsten copper electrode, the finer tungsten granularity, the harder materials. In addition, in the completely compacted conditions, the finer tungsten powder, the smaller size of W grains in alloy and the binding strength of solid phase (W) and binder phase (Cu) with net structure is higher. On the contrary, Tungsten powder particle size is too large, soft phase copper is more susceptible to aggregation, thus tungsten copper alloy electrodes W-30Cu lower hardness. As can be seen from the figure tungsten powder particle granularity is increased from 2.9μm to 11-13μm, hardness decreased from about 190HB to 178HB.

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