FORMATION MECHANISM OF INTERFACIAL REACTION LAYER IN SiCP/ZA22 COMPOSITES

Some MgAl₂O₄ reaction layers were discovered on the interface of SiC_P/α-Al in SiCP/ZA22 composites with STEM analyses and TEM observations, and the formation conditions were discussed. The results showed that the chemical reaction could take place spontaneously in thermodynamics within the range of temperature in which the composites was fabricated, the thickness of the reaction layer grew according to S=A t and the amount mainly depended on Mg content in the matrix as well as the thickness of SiO₂ on the surface of SiC_Particles.