Multi-component titanium-based coatings for lightweight solid oxide fuel cell interconnects

Keywords

solid oxide fuel cell, interconnect, titanium-based coatings, oxidation resis¬tance, surface electrical conductivity.

Cite as

Podhurska V. Ya., Klimenko I. O., Chepil R. V., Reshetnyak E. M., Shchur Ya. Yo., Andrushchak A. S., and Ostash O. P. Multi-component titanium-based coatings for lightweight solid oxide fuel cell interconnects. Physicochemical Mechanics of Materials. 2026. 62(1), 031-041.

https://doi.org/10.15407/pcmm2026.01.031

Abstract

The composition, structure, mechanical characteristics, long-term oxidation resistance and electrical conductivity of coatings produced by vacuum-arc deposition method using a cathode (target) made of Ti–6.1Al–5.5Zr–2.3Sn–0.8Mn–0.6Si–0.4Mo–0.3Nb titanium alloy were studied. The coatings were deposited on a 0.5 mm thick substrate made of a cost-effective Ti–2.2Al–1.5Mn–0.3Zr–0.3Fe–0.1C alloy at a substrate bias voltage U_bias = –50…–200 V. The properties of the materials were compared in the as-received state and after long-term holding for 1000 h at 600°C in air, simulating the effect of the cathode environment in solid oxide fuel cells (SOFCs). It was established that the plates with a 10 mm thick coating at U_bias = -100 V exhibit high oxidation resistance (Δm/S = 0.88 mg/cm²) and surface electrical conductivity in the oxidized state (σ = 2.4×10⁵ S/m) and meet the requirements for lightweight interconnect materials in cathode side of intermediate-temperature SOFCs.

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