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Thermal stability of nanostructured NiCrC coating prepared by HVAF spraying of cryomilled powders

Cui, Hua ; Tao, Kai ; Zhou, Xianglin ; Zhang, Jishan

Rare Metals, 2008, Vol.27(4), pp.418-424 [Tạp chí có phản biện]

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Nhan đề:
Thermal stability of nanostructured NiCrC coating prepared by HVAF spraying of cryomilled powders
Tác giả: Cui, Hua ; Tao, Kai ; Zhou, Xianglin ; Zhang, Jishan
Chủ đề: Nanostructure Coatings ; Grain Growth ; Heat Treatment ; High Velocity Air Fuel (Hvaf) ; Cryomilling ; Engineering
Là 1 phần của: Rare Metals, 2008, Vol.27(4), pp.418-424
Mô tả: Thermal stability of nanostructured NiCrC coating prepared by high velocity air-fuel (HVAF) spraying of cryomilled feedstock powders was investigated. Transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) were utilized for characteristic analysis. Recrystallization and normal grain growth occur when isothermal treatment is performed at 923 K (0.55 ) for up to 100 h, and the average grain size increases from initial 41 nm for as-deposited state to around 100 nm for nearly equilibrium state. Isochronal treatment at 823 K and 1023 K was also conducted for comparison. Accordingly, for 0.49 to 0.61 / , the time exponent deduced from - = increases from 0.15 to 0.30. The observed high thermal stability is attributed primarily to a Zener pinning mechanism arising from the fine Cr O dispersions and the solute drag effect as well.
Ngôn ngữ: English
Số nhận dạng: ISSN: 1001-0521 ; E-ISSN: 1867-7185 ; DOI: 10.1016/S1001-0521(08)60155-2

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