Pressureless infiltration mechanism of high content Si_p/Al composite

High content Si_p/Al composites were fabricated by pressureless infiltration. The statics of infiltration process were analyzed. It is indicated that aluminum melting liquid can infiltrate silicon loose packing porous perform because it conforms to the requirements of statics. The dynamics process that aluminum melt liquid infiltrates silicon loose packing porous preform was analyzed by resistant measurement method at real time. The results show that an approximate parabola curve of infiltration depth versus infiltration time is proved. It is indicated that the main mechanisms of continuous netlike Si phase are dissolution-deposition and appendiculate deposition of Si. The form-mechanism of few fine pores in the microstructure was investigated. The interface of Si_p/Al phases is clean and no reactants exist.