Effect of the pressureless post-sintering on the hot isostatic pressed AlO prepared from the oxidized AlN powder.

The effect of the pressureless post-sintering in hydrogen on the structural and mechanical properties of the hot isostatic pressed AlO prepared by oxidized AlN powder has been studied. The micrometer size AlN powder has been oxidized in air at 900° C and sintered by hot isostatic pressing (HIP) at 1700 °C, 20 MPa nitrogen atmosphere for 5 h. Pressureless sintering (PS) has been applied for all HIP sintered samples in H gas at 1800° C for 10 h.