Zirconium alloy cladding with improved oxidation resistance at high temperature and method for manufacturing same
The present invention relates to a zirconium alloy cladding with improved oxidation resistance at a high temperature and a method of manufacturing the same. More particularly, the zirconium alloy cladding includes a zirconium alloy cladding; and a Cr—Al thin film coated on the cladding, wherein the thin film is deposited through arc ion plating and the content of Al in the thin film is 5% by weight to 20% by weight.
1. A method of manufacturing a zirconium alloy cladding with improved oxidation resistance at a high temperature, the method comprising:
(a) manufacturing a target comprising Cr and Al; and
(b) depositing a Cr—Al thin film on a zirconium alloy cladding through arc ion plating in which a current and a bias voltage are applied to the target, wherein the content of Al in the target is 7% by weight to 23% by weight;
wherein, in step (b), the applied current is 30 A to 120 A and the applied bias voltage is 120 V to 400 V,
wherein, in step (b), a working pressure during the deposition is maintained at 5 mTorr to 20 mTorr, and
wherein an arithmetical average roughness (Ra) of the Cr—Al thin film deposited in step (b) is 5 μm or less.
2. The method according to claim 1 , wherein, in step (b), the deposition is performed at 200° C. to 300° C.
3. The method according to claim 1 , wherein, in step (b), the deposition is performed at a rate of 2 μm/h to 15 μm/h.
4. The method according to claim 1 , wherein, after the zirconium alloy cladding and the Cr—Al thin film deposited in step (b) is-being oxidized at 1200° C. for 2,000 seconds under a steam atmosphere condition, a weight increase of the zirconium alloy cladding and the Cr—Al thin film deposited in step (b) ranges 1 mg/dm 2 to 3,000 mg/dm 2 .