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Abstract
Thermodynamic analysis was carried out to predict the phase composition of polysilazane-type polymer derived ceramic coatings on a Ti-6Al-4V titanium alloy by calculating the most probable chemical reactions between the constituents and expected crystalline phases. The feasibility of polysilazane derived coatings on Ti-6Al-4V was proved experimentally. The coatings based on amorphous SiON and SiO2 and a free Si, which oxidized to SiO2 during high-temperature exposure, enhance the oxidation resistance of Ti-6Al-4V alloy at 800 °C in air up to eight times compared to an uncoated alloy.
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