| Title |
Microstructure and corrosion properties of plasma sprayed Al2O3 and Al2O3-TiO2 coatings / |
| Authors |
Šuopys, A ; Marcinauskas, L ; Griškonis, E ; Kėželis, R ; Uscila, R ; Aikas, M |
| ISBN |
9786090705575 |
| Full Text |
|
| Is Part of |
NBCM 2020: international conference on nanostructured bioceramic materials, 1-3 December 2020, Vilnius, Vilnius University: conference book.. Vilnius : Vilnius Univerity Press, 2020. p. 73.. ISBN 9786090705575 |
| Keywords [eng] |
microstructure ; corrosion ; Al2O3 ; Al2O3-TiO2 ; coatings |
| Abstract [eng] |
Al2O3 is one of the most highly used bio ceramics due to its abundance, low cost and inherently low levels of reactivity compared with other materials such as polymers and metals as well as surface reactive or resorbable ceramics. In a human body, they are expected to be non-toxic, non-allergenic, and non-carcinogenic for a life-time, which leads to a corresponding range of engineering design philosophies for medical application [1]. It is possible to enhance desired qualities by using alumina as a basis for composite materials. Addition of titania is known to increase corrosion resistance and reduce porosity of the coating [2,3]. Plasma-spraying technique is currently used commercially to produce ceramic coatings on metallic implants [4]. In this research atmospheric plasma spraying (APS) was employed to deposit Al2O3, Al2O3-3%TiO2, and Al2O3-13%TiO2 coatings on the steel substrate. Ceramic coatings were formed by direct current plasma torch at atmospheric pressure using air-hydrogen plasma. Microstructural analysis of the assprayed coatings was carried out using scanning electron microscopy (SEM). Elemental analysis of the coatings was performed using energy-dispersive X-ray spectroscopy (EDS), and phase composition was analyzed using X-ray diffraction. The corrosion behaviors of the coatings were performed using potentiostat in 0.5M NaCl solution for 96 hours. The surface microstructure, elemental composition and phase composition of the coatings was re-examined after the corrosion tests. Results indicated that coatings had only insignificant changes in surface morphology - no defects or delamination were found after chemical resistance tests. More pronounced changes were observed in elemental composition, where due to appearance of sodium and chlorine, the percentage of aluminum on the surface was reduced up to 10%. The XRD results indicated that γ-Al2O3 phase was the dominant phase in all coatings. Corrosion tests demonstrated that Al2O3-13%TiO2 coating exhibit the best anti-corrosion properties and showed the highest phase stability. |
| Published |
Vilnius : Vilnius Univerity Press, 2020 |
| Type |
Conference paper |
| Language |
English |
| Publication date |
2020 |
| CC license |
|
