Temperature Calculation In Plasma Electrolysis Saturation

In order to study the relationship between the temperature of workpiece and the electrical parameters in plasma electrolysis saturation, surface temperature calculation model and the internal temperature field calculation model were established. In the surface temperature calculation model, with the workpiece-envelope-electrolyte triphase system as the research objective, it is proposed that the surface of workpiece were surrounded by a continuous and stable envelope, and the heat conduction equation of envelope were built. The temperature distribution in the envelope was calculated by using appropriate boundary conditions. And the calculation results were compared with the theoretical results. The internal temperature field was simulated by ANSYS with the surface temperature as the boundary conditions. The results show that the temperature on the surface of workpiece increases with the voltage increases. The theoretical results are consistent with the experimental data on the promise of that the thermal conductivity of envelope is the function of temperature and the electrical conductivity of envelope is constant. In the electrolyte, as the content of HCONH2 increases, surface temperature decreases. The larger the treatment area, the lower the surface temperature can achieved at the same voltage. With the increase of the radius of the workpiece and the surface temperature, the temperature gradient increase within the workpiece. The depth of immersion had little affect on the radial direction temperature distribution.Based on the temperature calculation models, a system of temperature calculation in plasma electrolysis saturation was developed. The system had good human-computer interaction interface. When users input parameters, the system can quickly get the surface temperature and the internal temperature field. This system provides a theoretical basis for the optimal selection of process parameters in the plasma electrolysis saturation.In addition, the temperature field of single discharge channel was simulated by ANSYS. The results show that the temperature of the center of discharge channel exceeds 104℃, such high temperature causes melting and vaporization of the channel, then porous were formed, which is consistent with the surface morphology of diffusion layer by SEM. The formation of diffusion layer is composed of a series of melting and solidification process. Each discharge process existed transient melting behavior and transient solidification behavior of the substances in the channel.