Microstructures of In-situ TiB₂/Al₂O₃ Composite Ceramic

TiB₂/Al₂O₃ composite was produced by self-propagating high temperature combustion synthesis.XRD and SEM examination indicated that most particles of TiB₂ in the Al₂O₃ matrix are fine and regular rectanglar crystals,while some of them are dendritic and rodlike crystals.The grain size of Al₂O₃ is bigger than that of TiB₂ and the shape of Al₂O₃ grains is irregular.The fracture of Al₂O₃ is lamellar and both Al₂O₃ and TiB₂ present some coagulation.