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.

Processing of AlO-AlN Ceramics and Their Structural, Mechanical, and Tribological Characterization.

The aim of this study is to present a novel, lower sintering temperature preparation, processing, structural, mechanical, and tribological testing of the AlN-AlO ceramics. The precursor powder of AlN was subjected to oxidation in ambient environment at 900 °C for 3, 10, and 20 h, respectively. These oxidized powders were characterized by SEM and XRD to reveal their morphology, phase, and crystal structure.