Metallic materials with surface preservation or surface modification have attracted a lot of interest in industrial field where the working conditions are becoming increasingly harsh. In recent years, zirconium oxide (ZrO2) coatings were introduced as wear-resistant, corrosion resistant and thermal barrier on the surface of metal pairs because of its high strength and hardness, high melting point, well chemical stability, compatible thermal expansion coefficient with metals and high wear- and corrosion- resistance. Due to the above-mentioned properties, ZrO2 coatings have been used as surface protective coatings for different application which includes medical device manufacturing,automotive production, aerospace frame construction and coated cutting tools fabrication. Babatunde et al. obtained Ti–Ni–ZrO2 composite coatings by laser deposition, and significantly enhanced the tribocorrosion resistance of AISI 316 stainless steel substrates. Bernard et al. reported yttria stabilized zirconia (YSZ) thermal barrier coatings applied on the hot section components of aero engines. The thermal conductivities measurements showed that the YSZ coatings fabricated by suspension plasma spraying had excellent thermal insulation properties. Berni et al. prepared zirconia coatings on Ti6Al4V components of a prosthesis, and the results showed the beneficial effect of zirconia coatings in hardness improvement and wearreduction. Jadhav et al. reported a tungsten carbide tool coatedwith yttria-stabilized zirconia (YSZ) coatings. It was revealed that the zirconia coatings improved the resistance to wear and enhance the tool life. Sol-gel technology has emerged as a feasible method for ZrO2 coatings fabrication with the feature of convenience, easy-controllability and high-purity. The nano-particles in the sol have high specific surface energy, which would contribute to the formation of dense ZrO2 coatings with well adhesive strength to the metal substrates. The ceramic coatings typically exhibited a high friction coefficient (~ 0.4), which can easily lead to severe friction heat and even fatigue wear. For example, as a thermal barrier coating, the machining tools could be revamped by ZrO2 coatings to meet the machining demands such as hot hardness.
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