Alumina-base plasma-sprayed materials—Part II: Phase transformations in aluminas

摘要: Aluminum oxide is widely used for plasma spraying. Alumina deposits consist of a number metastable crystallographic modifications, which at elevated temperatures, transform to the stable α phase. It was shown that additions various oxides changed phase composition and shift transformation temperatures. This paper addresses variation compositions temperatures changes plasma-sprayed alumina manufactured with alumina-base materials containing O2O3 TiO2. study combines results obtained from energy dispersive analyzer X-rays (EDAX) scanning electron microscopy (SEM) chemical analysis, differential thermal analysis (DTA), X-ray powder diffrac-tion (XRD) quantitative as-sprayed annealed samples shows how two additives change α-phase formation temperature. temperature varied by nearly 200 °C. The sequences were also influenced composition; example, content 6 between 0 55 wt %.