Abstract
Hypoeutectic and hypereutectic Al2O3+ZrO2 multiphase ceramic-lined composite pipes were produced by using the gravitational separation self-propagate high-temperature (SHS) process. The microstructure of the ceramics was observed by means of SEM and EPMA. The multi-phase ceramics base consists of lamellar or rod-like eutecticum of ZrO2with Al2O3, and Al2O3dendrite is distributed between (Al2O3+ZrO2) eutecticum and the ZrO2is distributed on boundary area between (Al2O3+ZrO2) eutecticum in appearance of band and particle alone in the hypoeutectic multi-phase ceramics, and ZrO2is distributed between (Al2O3+ZrO2) eutecticum in appearance of snowflake-like or fishbone-like in hypereutectic multi-phase ceramics. On the basis of combustion synthesis, material thermodynamics, metallurgy dynamics and ceramics materials theory, the formation of microstructure mechanism have been systematically investigated.
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