Segregation as a driving force in the formation of nanocomposite ZrO 2-Al 2 O 3 coatings Academic Article uri icon

abstract

  • Abstract ZrO 2-Al 2 O 3 coatings were deposited on a floating substrate at a temperature of 370° C. Various coating compositions, ranging from pure zirconia to 50 at.% alumina content, were deposited by reactive pulsed-DC magnetron sputtering using 51 mm diameter Zr and Al targets. The coating had a Zr-Al-O solid solution structure that was composed of nano-size cubic-ZrO 2 grains (20±5 nm) with aluminum cations distributed inside them. The deposited coatings were annealed up to 1350° C and their structural changes were studied using Differential Scanning Calorimetry (DSC), X-ray diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM) and Vickers hardness measurement. Two exothermic annealing events were observed. The first event appeared at 700–750° C and was contributed to aluminum segregation to the grain boundaries, and the formation of a …

publication date

  • March 25, 2017