电火花沉积电极材料过渡形态研究

Study on Transition Morphology of Electrospark Deposition Electrode Materials

电火花沉积层由电极材料过渡沉积构成,因此研究电极材料的过渡形态对研究电火花沉积效率和沉积层质量等具有重要意义。通过不同能量条件下电火花沉积试验,研究电极材料过渡物质形态及其对沉积效率和沉积层质量的影响。结果表明:电火花沉积效率受放电能量、电极端部基础温度、电极材料过渡形态等影响;电火花沉积的单次放电能量、放电时机,电极材料的单次熔化量、过渡时机、过渡物质形态等的不确定,影响沉积的稳定性和可控性;电极端部基础温度由电火花放电形成的热源和传导、对流、辐射等形成的冷源共同决定,对电火花沉积效率和沉积层质量有重要影响;电极基础温度低于熔点时以液态过渡为主、等于熔点时以半固态物质团过渡为主、高于熔点时以液态过渡为主。

The electro-spark deposits consist of transition deposits of electrode materials.It is of great significance to study the transition morphology of electrode materials for studying the deposition efficiency and quality of deposits.The transition material morphology of electrode materials and its effect on deposition efficiency and deposit layer quality were studied by electrospark deposition(ESD)experiments under different energy conditions.The results show that the efficiency of ESD is affected by discharge energy,base temperature at the end of the electrode and transition morphology of the electrode material.The stability and controllability of electro-spark deposition are affected by the single discharge energy and timing,the single melting amount of electrode material,the transition time and the uncertainty of the transition material shape.The base temperature at the end of the electrode is jointly determined by the heat source formed by the electric spark discharge and the cold source formed by conduction,convection,radiation,etc.,which has an important influence on the deposition efficiency and quality of the deposit layer.When the base temperature of the electrode is lower than the melting point,the liquid transition is dominant,when the base temperature is equal to the melting point,the semi-solid mass transition is dominant,and when the base temperature is higher than the melting point,the liquid transition is dominant.