Synthesis and characterization of in situ A1-A1N composite by nitrogen gas bubbling method

摘要

In situ A1-A1N composite with and without Mg addition was synthesized by nitrogen gas bubbling method. The morphology of the particles was found to be hexagonal by SEM and TEM. The size of the AIN particles was found to be in the range from nano, submicron to a few microns. XRD analysis of the extracted particles confirmed the formation of AIN in the melt. Mg addition enhanced the nitridation rate and formed network of interconnected AIN particles. Hardness of the composite is significantly increased by the hard AIN particles. Further, the mechanism of formation of AIN particles inside the molten aluminium by gas bubbling is discussed.