N. Toplan, University of Sakarya Eng. Fac., Sakarya, Turkey
In the present study, ZrO2-MgO system was selected in the production of oxygen sensor. It is worthwhile to point out that the high temperatures involved in the plasma-spraying process, the rapid quenching of the molten Mg-PSZ drops on the cold substrate during deposition. After this process thermal treatments was required to improve the film density and microstructural stability.
Plasma sprayed films were prepared by using MgO stabilized ZrO2 powders. Starting powders were high grade ZrO2 and natural hydromagnesite as MgO source. ZrO2, and MgO were mixed in the compositions ZrO2 -7,8,9,10 mol % MgO and milled in a ZrO2 ball mill with ZrO2 balls. The fine powders were stabilized by heating in air at 1540°C for 24 h. The powders were calibrated the correct grain size for plasma spraying. All samples were characterised by a well-defined microstructure with an average grain size of 10µm. Powder consists of monoclinic, tetragonal and cubic phases. This powder was sprayed using plasma spray technology to produce high temperature Mg-PSZ oxygen sensor tubes.Keywords: Plasma spray coating, powder production, zirconia ceramics
Summary: . In the present study,plasma sprayed films were prepared by using MgO stabilized ZrO2 powders. Starting powders were high grade ZrO2 and natural hydromagnesite as MgO source. ZrO2, and MgO were mixed in the compositions ZrO2 -7,8,9,10 mol % MgO and milled in a ZrO2 ball mill with ZrO2 balls. The fine powders were stabilized by heating in air at 1540°C for 24 h. The powders were calibrated the correct grain size for plasma spraying. All samples were characterised by a well-defined microstructure with an average grain size of 10µm. Powder consists of monoclinic, tetragonal and cubic phases. This powder was sprayed using plasma spray technology to produce high temperature Mg-PSZ oxygen sensor tubes.
