（Al2O3—SiO2）sf／Al—Si复合材料的界面反应

本文对液体浸渗法制备的（Ａｌ２Ｏ３－ＳｉＯ２）ｓｆ／Ａｌ－Ｓｉ复合材料界面反应进行了研究，采用化学反应涂层处理的方法，在Ａｌ２Ｏ３－Ｓｉｏ２短纤维表面涂覆一层非晶态的ＳｉＯ２，从而改变纤维与基体的结合方式，使界面由溶解结合转变为反应结合，并产生了ＭｇＡｌ２Ｏ４界面反应相，ＭｇＡｌ２Ｏ３相的大小和分布对复合材料的力学性能产生重要影响，ＭｇＡｌ２Ｏ４在界面呈非连续的块状分布时，复合材料强度最高，当界在

INTERFACIAL REACTION OF (Al_2O_3-SiO_2)_(sf)/Al-Si COMPOSITE

The interfacial reaction of (Al2O3-SiO2)sf/Al-Si composite fabricated by liquid infiltrationprocess was studied. Using chemical reaction coating technology, amorphous SiO2 coating formed on thesurface of the reinforced short fibers. This coating can change the bonding way between the fibers andmatrix alloy, from metallic to chemical bonding. MgAl2O4 phase as chemical reaction forms along theinterface. The size and distribution of MgAl2O4 will make an important effect on the mechanical propertiesof the composite. When the interfacial reaction is proper to make the block-like MgAl2O4 distributingalong the interface discolitinuously, the composite has high strength; when the illterfacial reaction is strong,MgAl2O4 will continuously distribute along the interface, the strength of the will be reduced largely. Theinterfacial structure can be adjusted efficiently by controlling the reaction time and temperature, whichmakes the composite have better mechanical properties.