Morphology and phase
composition of platinized Ebonex®
materials
Chem.
Met. Alloys 14 (2021)
25-30
https://doi.org/10.30970/cma14.0416
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.
Keywords
Platinized Ebonex® / Thermal treatment / Morphology / Phase
composition