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为探讨 Si CP/ Al基复合材料无压浸渗反应机理 ,利用 XPS鉴定了 Si C预制体浸渗前沿界面上的反应产物结构 ,采用 HRTEM研究了 Si CP/ Al基复合材料的界面结构。结果表明 ,浸渗与未浸渗部分之间的界面上存在 Mg O,Al2 O3和 Zn O诸化合物 ,没有发现氮的化合物。在 Si C相与铝相的界面上仅存在 Mg Al2 O4相 ,Mg Al2 O4相几乎连续地包敷在 Si C颗粒上。这表明 ,高温下 Si C与熔 Al合金接触后 ,Si C颗粒表面上的 Si O2 与 Al,Mg,Zn诸元素发生了放热反应 ,从而降低了表面张力 ,提高了湿润性 ,促进了自发浸渗
In order to investigate the pressureless infiltration reaction mechanism of Si CP / Al matrix composites, the structure of reaction products at the interface of Si C preform infiltration was identified by XPS. The interface structure of Si CP / Al matrix composites was investigated by HRTEM. The results show that MgO, Al 2 O 3 and ZnO compounds exist at the interface between the infiltrated and non-infiltrated portions, and no nitrogen compound is found. There is only the MgAl2O4 phase at the interface of the SiC phase and the aluminum phase, and the MgAl2O4 phase is almost continuously coated on the SiC particles. This indicates that the Si O2 on the surface of Si C particles reacted exothermically with elements such as Al, Mg and Zn after contact of the Si C with the molten Al alloy at high temperature, thereby lowering the surface tension, improving the wettability, and promoting spontaneous Infiltration