Add time:08/02/2019 Source:sciencedirect.com
Aluminum nitride (AlN) ceramics were prepared by hot-pressing with Y(NO3)3·6H2O as sintering additive. The mechanical properties including flexural strength, Vickers’ hardness, and fracture toughness were studied. The relative density and mechanical property of the monolithic AlN were improved by adding Y(NO3)3·6H2O, which decreased the porosity. At 2 wt% Y2O3, the AlN ceramic exhibited the highest strength of 383 MPa, the highest hardness of 15.39 GPa, and the highest fracture toughness of 3.1 MPa m1/2. However, doping with more additive, the strength, hardness, and toughness of AlN ceramics decreased because of the weak interfacial bonding between AlN matrix and the yttrium aluminates phase.
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