We prepared YSZ-based composite coatings with CaF₂/Al2O₃ as additives using atmospheric plasma spraying (APS). We prepared two groups: Group A (YSZ + 6% CaF₂ + 6% Al₂O₃) and Group B (YSZ + 12% CaF₂ + 12% Al₂O₃), and investigated their tribological performance and lubrication mechanisms across a wide temperature range (room temperature –1100 ℃ ). Results show that Group B, with higher additive content, exhibited lower room-temperature Vickers hardness (337HV_0.5) than Group A (423HV_0.5), but achieved a significantly reduced friction coefficient of 0.22 at 800 ℃. At low temperatures (≤400 ℃), mechanical strength dominated friction behavior, while at high temperatures (≥600 ℃), CaF₂ actively reduced shear strength through ductile-to-brittle transition, synergizing with Al₂O₃ to dynamically form oxide glaze layers that enhanced lubrication. At 1100 ℃ , Group A developed a stable glaze layer via Ca diffusion and CaZrO₃ formation, lowering the friction coefficient to 0.16, whereas Group B failed due to excessive additive content.