Preparation and properties of Al-Al2O3 metal ceramics via powder metallurgy methods

摘要

Metal ceramics are outstanding new engineering materials that offer the advantages of both ceramics and metals. In this study, Al-Al2O3 metal ceramics were prepared through powder metallurgy methods, and the densification and properties of the prepared metal ceramics were investigated to gain insights into the preparation of high-performance cermet materials. Results revealed that as the forming pressure was increased, the relative density of the ceramics increased, whereas their electrical resistivity decreased. The relative density increased with increasing sintering temperature up to 700 degrees C and decreased beyond 700 degrees C, whereas the electrical resistivity exhibited an opposite trend. The relative density increased with increasing Al content, whereas the electrical resistivity displayed an opposite trend. Under optimal technological parameters of 700 degrees C sintering temperature, 20 MPa forming pressure, and 75 wt% Al content, Al-Al2O3 metal ceramics with a high relative density (97.52%) and a low electrical resistivity (101.34 Omega center dot m) were successfully prepared.