Super-wear-resistant zirconium alloy cladding surface composite coating and preparation method thereof

The invention discloses a super-wear-resistant zirconium alloy cladding surface composite coating and a preparation method thereof, and belongs to the technical field of nuclear fuel cladding surface coatings. The composite coating sequentially comprises a Mo layer, a Cr layer and a CrN layer from inside to outside. The composition of the Mo layer is Mo pure metal, and the composition of the Cr layer is Cr pure metal; the thickness of the Mo layer is 0.5-3 [mu] m, the thickness of the Cr layer is 8-15 [mu] m, and the thickness of the CrN layer is 1-6 [mu] m. The super-wear-resistant zirconium alloy cladding surface composite coating designed by the invention sequentially comprises a Mo layer, a Cr layer and a CrN layer from inside to outside, the composite coating is well combined with a zirconium alloy matrix, the structure is uniform and compact, the wear resistance and the oxidation resistance are excellent, and the normal service condition performance of the fuel cladding and the capability of resisting s