Tungsten Copper Electrode Liquid-phase Sintering Theory (1/2)

Tungsten copper electrode has both advantages of tungsten (W) and copper (Cu), such as high melting point, high density and high hardness of tungsten, excellent thermal and electrical conductivity of copper. Due to the big difference between tungsten and copper (the melting point of tungsten is 3387℃, the melting point of copper only 1083℃), it makes tungsten copper sintering become a typical liquid-phase sintering.

During the liquid-phase sintering process, Solid solubility in the liquid phase, the solid and liquid phases of liquid interfacial energy and the ability to penetrate the solid phase along the grain boundaries greatly affected the speed of change in the sintering and microstructure. In addition, the parameters, such as the granularity of particle distribution, powder purity, sintering temperature, sintering time, sintering atmosphere and the compact density are all the significant influencing factors of tungsten copper electrode. Liquid-phase sintering must meet wettability, solubility, phase number three conditions, the wettability of the solid, liquid surface tension (specific surface energy) interfacial tension γ_S, γ_L and two-phase (interfacial energy) γ are decided. 

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