کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5464430 | 1517554 | 2017 | 28 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation mechanism of high activity aluminide coating on Ni-CeO2 coated Rene 80 alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Formation mechanism of high activity aluminide coating on Ni-CeO2 coated Rene 80 alloy Formation mechanism of high activity aluminide coating on Ni-CeO2 coated Rene 80 alloy](/preview/png/5464430.png)
چکیده انگلیسی
High temperature oxidation behavior of protective oxide scales can be improved by surface doping with reactive elements such as cerium. In this investigation, an intermediate Ni-CeO2 layer was electrodeposited on the surface of Rene 80 nickel-based superalloy before pack cementation aluminizing treatment. Electrodeposition of the Ni-CeO2 layer was carried out using direct current and Watts nickel electroplating bath containing 30 g/lit nano ceria particles. Electrodeposited specimens were aluminized in a powder mixture of aluminum, ammonium chloride, and alumina by a two-step treatment at 760 and 1040 °C to form an inward growth-type coating. Cross-sections of the coated specimens were studied by means of scanning electron microscopy, energy dispersive spectroscopy and X-ray diffractometry. The results showed that after aluminizing the composite intermediate layer converts to an Al-rich NiAl layer with a porous and CeO2-free surface zone below which a CeO2-containing layer exists. Three-zone microstructure of two-step aluminide coatings on nickel-based superalloys was observed below the CeO2-containing layer. The mechanism of coating formation was discussed. The oxidation resistance of the CeO2 modified coating in 10 five-hour cycles at 1050 °C was considerably better than the unmodified coating.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 329, 25 November 2017, Pages 218-223
Journal: Surface and Coatings Technology - Volume 329, 25 November 2017, Pages 218-223
نویسندگان
Mahdi Safari, Farhad Shahriari Nogorani,