The Effect of the Addition of Y₂O₃ on the Microstructure of Polycrystalline Alumina Ceramics

• Main Authors: Serkan Abalı, Cem Uğur Karaçam
• Format: Article
• Language: English
• Published: MDPI AG 2018-11-01
• Series: Proceedings
• Subjects: alumina; yttrium aluminum garnet; composites; energy efficiency; sintering; mechanical properties; microstructure
• Online Access: https://www.mdpi.com/2504-3900/2/23/1407

In the scope of this study, a powder mixture was prepared that contained 3 Al₂O₃-Y₂O₃ consisting of 99.99% pure Al₂O₃ and aluminum oxide of 65–67% and 70% by weight of 99.999% pure Y₂O₃ powders. After the powders were weighed on a precision scale, the milling process was carried out in a vibratory disc mill. For the granulation, 3 powder mixtures that were subject to sintering were sieved to a size of less than 106 µm in a powder sieve shaker. The powders were shaped with a cold isostatic press after this step and the 3 acquired samples were sintered for 12 h under a temperature of 1923 K. Selected physical and mechanical behaviors were taken by evaluating microhardness measurements, bending strength XRD analysis and electron microscope images of the 3 sintered samples. The changes in the Y₂O₃ additive and phase composition, microstructure, and mechanic properties were examined.