<p>Prolonging the service life of the continuous casting mold is of great significance for improving slab quality, enhancing economic efficiency, and ensuring operational security. The service life of the mold is primarily related to the friction and wear properties of the coating on the inner surface of the copper plate. This study first focused on Ni–Co and Ni–Co–Al₂O₃ coatings as the research subjects, carried out reciprocating friction tests to measure the friction coefficient, wear depth, and wear volume of the coatings under temperature and sinusoidal oscillation conditions of the slab continuous casting. The effects of load, temperature, and stroke length on the wear behavior of the coatings were systematically investigated. Then, based on Archard’s wear theory, a finite element model with the sinusoidal relative motion between the copper plate and the pin was established. According to the wear and friction experiment conditions, the wear depth was calculated and validated with the experimental data. The wear behavior under non-sinusoidal motion was compared with that under sinusoidal motion. The results indicate that the dominant wear mechanism of the coatings is adhesive wear. The wear volume increases with higher load and longer stroke, while it decreases with increasing temperature and prolonged cycles. The predicted wear depths under different loads, temperatures, and stroke lengths are in good agreement with the experimental results. Prediction of the wear behavior under the non-sinusoidal motion mode shows that the distribution of wear depth is asymmetrical between the left and right sides. Notably, compared with Ni–Co coatings, Ni–Co–Al₂O₃ coatings exhibit a lower friction coefficient and reduced wear loss, with an average reduction of 11.3 pct in friction coefficient and 16.5 pct in wear depth, indicating that Al₂O₃ particles enhance the wear resistance of the coatings.</p>