Self-propagating high-temperature reductive synthesis of TiB₂-Al₂O₃ composite powders

Abstract

TiB₂-Al₂O₃ composite powders were produced by self-propagating high-temperature synthesis(SHS) method with reductive process from B₂O₃-TiO₂-Al system. X-ray diffraction(XRD) and scanning electron microscopy(SEM) analyses show the presence of TiB₂ and Al₂O₃ only in the composite powders produced by SHS. The powders are uniform and free-agglomerate. Transmission electron microscopy (TEM) and high resolution electron microscopy (HREM) observation of microstructure of the composite powders indicate that the interfaces of the TiB₂-Al₂O₃ bond well, without any interfacial reaction products. It is proposed that the good interfacial bonding of the composite powders can be resulted from the TiB₂ particles crystallizing and growing on the Al₂O₃ particles surface with surface defects acting as nucleation centers.

Keywords

SHS with reductive process / TiB₂-Al₂O₃ composite powders / B₂O₃+TiO₂+Al system / microstructure

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