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在铸造法制金属基复合材料过程中,金属基体与增强相间相互润湿是一个非常重要的条件解决金属液/增强相间润湿性问题的途径主要有物理方法和化学方法两种,施加电流是一种物理方法,与化学涂层、添加合金元素等化学方法相比,它不会给金属液带来成分的变化,或在界面上产生严重的化学反应,使得界面的强度受到破坏;该法与其他物理方法如压力浸渗。搅拌铸造、超声振动相比,将避免气体或氧化膜的混入,而且所需设备简易.然而,电流对金属液/固相润湿的作用很少有报道.在金属基复合材料大家族中,金属基体多采用共晶系合金,如Al-Si,Al-Mg,Fe-C系等;增强相常用石墨、钨丝、碳纤维等导体材料.故本文选择典型二元共晶系Sn-Pb合金作为金属液,导体纯铜作为固相衬板,用座滴法来研究电流对液固两相润湿过程的影响,本文用Gouy-Chapman和Stern双电层理论来分析相关现象.
In the casting process of the metal matrix composites, the wetting between the metal matrix and the reinforcing phase is a very important condition. There are mainly two physical and chemical methods to solve the problem of the wettability between the liquid metal and the reinforcing phase. The applied current is one Compared with the chemical methods such as chemical coating and adding alloying elements, the physical method does not bring changes in the composition of the metal liquid or cause serious chemical reactions at the interface, so that the strength of the interface is damaged. This method and Other physical methods such as pressure impregnation. However, the effect of current on metal liquid / solid phase wetting is seldom reported.In the large family of metal matrix composites, Eutectic alloys such as Al-Si, Al-Mg and Fe-C are often used as the metal matrix, and conductor materials such as graphite, tungsten wire and carbon fiber are often used as reinforcing phases, so typical binary eutectic Sn-Pb alloys As the metal liquid, the conductor copper is used as the solid-phase liner, and the droplet method is used to study the influence of current on the wetting process of liquid-solid two phases. In this paper, Gouy-Chapman and Stern electric double layer theory are used to analyze the related phenomena.