Effect of TiO₂ and MgO on Microstructure of α-Alumina Ceramics and its Sintering Behavior

Abstract

Observation on the effect of adding titanium oxide (TiO2) and magnesium oxide (MgO) on the sintering of α-alumina (Al2O3) has been performed. In this study, technical alumina used as basic material in which the sample is formed by the pressureless sintering/cold press and sintered at 1500°C which is lower than alumina sintering temperature at 1700°C. Elemental analysis, observation of microstructure, hardness, fracture toughness and density measurements were carried out to determine the physical and mechanical properties of alumina. The results indicate a change in the microstructure where the content of the platelet structure are much more than the equilateral structure. At sintering temperature of 1500°C, neck growth occurs at ceramics grain, supported by the results of the density test which indicate perfect compaction has occurred in this process.

Efek Penambahan Aditif SiO2 terhadap Suhu Sintering, Sifat Fisis, Struktur Kristal dan Mikrostruktur pada Keramik Al2O3

“…Dan sampel pada penelitian tersebut disintering dengan variasi suhu sintering 1500˚C, 1550˚C dan 1600˚C. Untuk menghasilkan sifat alumina yang diinginkan, beberapa cara dilakukan seperti contohnya penambahan aditif dan modifikasi mikrostruktur [3].…”

Effect of TiO2addition on microstructure and mechanical properties of alumina‐based cores prepared by sol‐gel method

“…On the one hand, alumina‐based cores can be utilized in high‐temperature applications ( T > 1700°C) without reacting with the above‐mentioned superalloys, excellent flexural strength, and moderate thermal shock resistance . Several additives have been employed to improve the properties of alumina cores such as magnesia,, titania, silica sol, yttria, zircon, etc. Among all of them, titania has the potential to give new interesting features to alumina cores, too.…”