Metallographic and Performance Analysis of Tungsten Copper Electrode

The tungsten copper powder sintered material is distributed in the form of tungsten as the skeleton evenly on the copper matrix. Due to the high melting point and high hardness of tungsten W, tungsten at 1000 ℃, its ultimate tensile strength is still 50kgf / mm2, higher than the strength of low-carbon steel at room temperature, which makes the tungsten copper material in the copper melting point Below the temperature (about 1000 ℃ or so), still has a high anti-wear and thermal hard. The tungsten skeleton is made of copper as a matrix, and constitutes a good conductor of sintered material and heat dissipation path, so that the tungsten skeleton in the course of the use of the phenomenon will not produce local overheating.

The room temperature strength of commonly used metals is mainly determined by two basic factors, namely, the adhesion of metal atoms and the resistance to dislocation. In the tungsten copper material as a resistance electrode often used to increase the resistance to dislocation movement method to improve the strength, including cold hardening and hardening and other methods. However, the enhanced effect of these methods will be significantly reduced with the temperature of the tungsten copper alloy, and eventually disappear. For example, cold hardened copper electrode, room temperature hardness can reach HB100-110, but when the temperature rises to 200-250 ℃, this cold hardening effect will all disappear. In addition, most of the precipitated phase precipitates a strengthened copper alloy, and when the temperature reaches 500 to 650 ° C, the strength is rapidly reduced due to the re-incorporation of the precipitated phase into the substrate. In contrast, copper tungsten powder sintered material does not undergo phase change, recrystallization or recrystallization at high temperatures. Some of the tungsten copper material research data show that tungsten copper W-30Cu hardness and conductivity than beryllium copper, softening temperature is more than twice the beryllium copper. Therefore, the tungsten copper material as the flash butt welding or arc welding electrode, especially in the case of continuous operation at high temperatures, the conductivity and wear resistance of the higher occasions, more prominent tungsten copper electrode material Superiority.