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알루미늄 확산코팅된 내열 스테인리스강의 반복주기 고온부식 거동
송진엽,황순영,성병근,김규영 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.7
To improve the corrosion resistance of heat resistant stainless steels (HRSS) at high temperature, pack aluminization of these steels was performed. Two kinds of HRSS (MO-RE 1, HK40) were used for pack aluminization during which the activity of an aluminum source was varied. Various microstructures of the aluminized HRSS were studied. To evaluate and study the corrosion resistance, cyclic corrosion tests in simulated COG (coke oven gas) combustion environment were performed. After the tests, the degradation mechanisms of the pack aluminized HRSS were presented. Especially, the inward diffusion rate of aluminum in aluminized HRSS was more pronounced than that in aluminized Ni-base alloys. In addition, the pack aluminized HRSS in the medium low activity of the aluminum source showed much better corrosion resistance than the uncoated HRSS.
초고속 용사법을 이용한 Zr65Al7.5Ni10Cu17.5 합금의 비정질 후막 형성
박찬경,김형준,임경묵,성병근 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.4
This investigation was conducted to clarify the effects of process variables such as spraying distance and fuel flow rate on the formation of the new amorphous coating using Zr_(65)Al_(7.5)Ni_(10)Cu_(17.5) alloy by a HVOF(High Velocity Oxygen-Fuel) spraying process. Powder used for spraying was prepared by vacuum gas atomization and centrifugal-mill. HVOF spraying experiments were carried out using a Tafa JP-5000 spraying gun. The amorphous content was measured up to about 65% depending on the spraying parameters. The amorphous fraction is decreased with increasing the spray distance. Microstructural observations and XRD analysis reveal that the change of amorphous fraction is attributed to the degree of solidification of droplets and the oxide (ZrO₂) formation in coatings. The higher fuel flow rate resulted in the decrease of amorphous fraction, and this decreased amorphous fraction was caused by the increase of oxide fraction. Therefore, flame temperature and spray distance that can control the oxide formation in coating and undercooling effects of droplets are the most crucial factors for the formation of amorphous coating using this alloy system.