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The effect of La2O3 addition on in-suit reaction of Al–CuO system

La2O3 was added into Al–CuO system to form Al–CuO–La2O3 system. The reactants were mixed and pressed into a precast block in a certain proportion, and pressed it into pure copper melt to complete in situ reaction. When the temperature of melt drops to the near melting point of pure copper, casting is performed to obtain sample material in which the in situ reaction products distributed in copper matrix. The morphology, size and distribution of in situ reaction products were observed by differential thermal analyzer, x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and transmission electron microscopy. The mechanism of influence of La2O3 addition on in-suit reaction of Al–CuO system was studied. The results show that the in situ reaction products of Al–CuO–La2O3 system are mainly Al2O3 particles and a small amount of LaAl11O18 particles. Compared with in situ reaction products of the Al–CuO system, the size and morphology of the Al2O3 particles changed obviously. The size of Al2O3 particles decreased from 30 to 150 nm, and the morphology changed from spherical to irregular.In addition,the Al2O3 particles dispersed evenly in copper matrix.