کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5358235 | 1503617 | 2015 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxidation behavior of AlMgB14-TiB2 composite at elevated temperature
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The isothermal oxidation behavior of AlMgB14-TiB2 composite was investigated at the temperature range from 600 °C to 1000 °C in air for 10 h. The results showed that the oxidation kinetics of this composite obeyed the parabolic law with an activation energy of 176 ± 20 kJ molâ1 from 700 °C to 1000 °C, the corresponding parabolic rate constant increased from 0.0069 Ã 10â8 kg2 mâ4 sâ1 to 138.75 Ã 10â8 kg2 mâ4 sâ1. The SEM micrograph of the oxidized surface at 700 °C for 10 h indicated that only the TiB2 phase was changed. The AlMgB14 phase changed at 800 °C in air, and the oxide scale consisting of TiO2 and borate glass dissolved with MgO and Al2O3. Meanwhile, a number of pores also existed in the oxide scales. The oxide scales at 1000 °C were divided into three layers: an outer glassy B2O3 layer, a middle oxide layer with small size pores, and a reaction layer with large size pores formed as the oxidation of the AlMgB14 phase. The formation mechanism of the oxidized layers was analyzed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 347, 30 August 2015, Pages 155-161
Journal: Applied Surface Science - Volume 347, 30 August 2015, Pages 155-161
نویسندگان
Yu Lei, Qing-sen Meng, Lei Zhuang, Shao-ping Chen, Jing-jie Dai,