اثر زمان آسیاکاری و افزودن آلیاژ Ce-75Ni 25 بر خواص واجذب هیدروژن کامپوزیت پایه هیدرید منیزیم تولیدی به‌روش آلیاژسازی مکانیکی

نویسندگان

گروه مهندسی مواد، دانشگاه صنعتی نوشیروانی، بابل

چکیده

در این تحقیق، ماده کامپوزیتی با ترکیب هیدرید منیزیم- 10 درصد وزنی (25 سریم- 75 نیکل) با آسیاکاری پودر هیدرید منیزیم و آلیاژ سریم- نیکل که به‌روش ذوب مجدد قوسی تحت خلاء تولید شده است، تهیه ‌شد. اثر زمان ‌آسیا و افزودنی بر ساختار هیدرید منیزیم شامل اندازه کریستالیت، کرنش شبکه و اندازه ذره و همچنین خواص واجذب هیدروژن کامپوزیت‌های حاصل ارزیابی ‌شد و با هیدرید منیزیم خالص آسیاکاری شده مقایسه شد. نشان داده شد که افزودن آلیاژ 25 سریم- 75 نیکل به هیدرید منیزیم منجر به اندازه ذره کوچک‌تر می‌‌‌شود. به‌عنوان یک نتیجه، دمای واجذب هیدرید منیزیم فعال شده مکانیکی، از 340 به 280 درجه سانتی‌گراد برای کامپوزیت یک (پنج ساعت آلیاژسازی مکانیکی) و به 290 درجه سانتی‌گراد برای کامپوزیت دو (15 ساعت آلیاژسازی مکانیکی) کاهش یافته است. بهبود بیشتر در دمای واجذب کامپوزیت یک می‌تواند مربوط به اندازه ذرات ریز‌تر و مقدار بیشتر فاز Mg2NiH4 مرتبط باشد که با نتایج آنتالپی محاسبه شده مطابقت دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Milling Time and 25Ce-75Ni Addition on Hydrogen Desorption Properties of Magnesium Hydride-based Composite Produced by Mechanical Alloying

نویسندگان [English]

  • F. Z. Akbarzadeh
  • M. Rajabi
Department of Materials Engineering, Noshirvani University of Technology, Babol, Iran
چکیده [English]

In this study, the composite material with composition of MgH2-10 wt% (25Ce-75Ni) has been prepared by co-milling of magnesium hydride powder with Ce-Ni alloy produced by vacuum arc remelting method. The effect of milling time and additive on magnesium hydride structure, i.e. crystallite size, lattice strain and particle size, and also hydrogen desorption properties of obtained composite were evaluated and compared with pure milled MgH2. It has been shown that the addition of 25Ce-75Ni alloy to magnesium hydride yielded a finer particle size. As a consequence, the desorption temperature of mechanically activated MgH2 decreased from 340 °C to 280 °C for composite 1(5 h mechanical alloying) and to 290 °C for composite 2 (15 h mechanical alloying). Further improvement in the hydrogen desorption tempreture of composite 1 can be related to finer particle size and higher Mg2NiH4 phase value, which corresponded with calculated enthalpy results.

کلیدواژه‌ها [English]

  • MgH2
  • Ce-Ni alloy
  • Hydrogen desorption temperature
  • mechanical alloying

مراجع

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مواد پیشرفته در مهندسی
دوره 36، شماره 4
اسفند 1396
صفحه 31-43

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