To improve the oxidation resistance and corrosion resistance of Zr-4 alloy, titanium nitride（TiN） coatings were prepared on the Zr-4 alloy with a TiN ceramic target with different ratios of N2. Microstructure and high-temperature properties of the TiN coated samples were studied by scanning electron microscopy（SEM）, energy dispersive spectrometer（EDS）, X-ray diffraction meter（XRD）, X-ray photoelectron spectroscopy（XPS）, heat treatment furnace and autoclaves, respectively. The x value of the TiN coatings（TiNx） ranges from 0.96 to 1.33. After the introduction of N2, TiN coating exhibits a weak（200） plane and a preferred（111） orientation. The coating prepared with an N2 flow ratio of 15% shows an optimal oxidation resistance in the atmospheric environment at 800 °C. In either 1 200 °C steam environment for one hour, or deionized water at 360 °C and a pressure of 18.6 Mpa for 16 d, the opitimized TiN coated samples have no delamination or spallation; and the gains in the masses of samples are much smaller than Zr-4 alloy. These results demonstrate the effectiveness of the optimized TiN coating as the protective coating on the Zr-4 alloy under extreme conditons.
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