Morphology and phase composition of platinized Ebonex® materials
Chem. Met. Alloys 14 (2021) 25-30
Olesia SHMYCHKOVA, Tatiana LUK’YANENKO, Pavlo DEMCHENKO, Roman GLADYSHEVSKII, Alexander VELICHENKO
The influence of the synthesis conditions on the morphology of an Ebonex®/Pt surface and the phase composition has been established. It is shown that during electrochemical deposition of platinum onto an Ebonex® surface, the coating is not continuous, but is represented by individual islands of metal with weak crystallinity deposited on the substrate. After the heat treatment, the surface morphology becomes similar to that of pure Ebonex®, and the only difference resides in a small amount of tiny platinum crystals fused into the substrate. Chemical interactions of metallic platinum with the titanium oxides, accompanied by encapsulation of the metal by oxides at high temperatures, are likely. It was found that, without thermal treatment, the platinum coating is largely X-ray amorphous, and its crystallinity increases with increasing annealing temperature and time. In parallel, the internal stress of the coating is reduced by a factor 4.
X-ray diffractograms of Ebonex®/Pt coatings compared to metallic Pt. Digits indicate the Miller indices hkl of the reflections of platinum.
Platinized Ebonex® / Thermal treatment / Morphology / Phase composition