The present study investigated the performance of ceramic aluminum oxide (Al₂O₃) and yttrium oxide (Y₂O₃) coatings along with a combined Y₂O₃ and tungsten (W) coating as high-temperature permeation barriers. To evaluate the permeability, these coatings were applied using the physical vapor deposition (PVD) process onto a palladium membrane. The hydrogen permeability of the three coatings was assessed using both absorption and permeation test methodologies between 300°C and 400°C. Results indicated that at 300°C, the Y₂O₃ coating has the most stable performance at various delta pressures with hydrogen permeation below the detection limit of the measurement system. Although the dual coating of Y₂O₃ + W is stable at lower pressure range, it seems to become ineffective at a pressure above 700 Pa. Al₂O₃ reduces hydrogen permeability compared to the pure Pd but the hydrogen permeability increases as the pressure increases in the same trend as the pure Pd sample. The bond strength of the PVD coatings to a low activation ferritic martensitic steel substrate was successfully evaluated through scratch testing. The P91 steel substrate surface was laser textured to 1 μm in order to study the effect of surface roughness on the interface bonding strength. The untextured surface showed clear cohesive and adhesive fractures, whereas the laser-textured surfaces exhibited higher resistance to fractures. Among the tested coatings, the Al₂O₃ coating demonstrated the highest bond strength.