Author/Authors :
Hong-xia Lu، نويسنده , , Hongwei Sun، نويسنده , , Guoxing Li، نويسنده , , Changping Chen، نويسنده , ,
Delin Yang، نويسنده , , Xing Hu، نويسنده ,
Abstract :
The microstructure and mechanical properties of Al2O3–5wt.% MgB2 composites were studied by scanning electron microscopy (SEM) and Vickers hardness measurements. The experiments show that MgO whiskers can grow at temperatures as low as 950 °C. When sintered at 1450 °C, due to the strong vaporization of Mg, MgO and MgAl2O4 appear around Al2O3 grains. The microstructure of the Al2O3–5wt.% MgB2 differs remarkably from Al2O3 sintered at the same temperature. The fracture toughness of the Al2O3–5% MgB2 composite is 4.0 MPa m1/2 which is slightly higher than for pure Al2O3 ceramics.
