رفتار اکسیداسیون فرسایشی آلیاژهای پایه نیکل حاوی مولیبدن در شرایط احتراق زباله در بستر سیال

نویسندگان

1 گروه مهندسی مواد، دانشگاه بناب، بناب، ایران

2 گروه مهندسی و علم مواد، دانشگاه هوکایدو، ساپورو، ژاپن

چکیده

رفتار اکسیداسیون فرسایشی آلیاژهای پایه نیکل محتوی مقادیر 7-0 درصد وزنی عنصر مولیبدن در شرایط احتراق زباله با بستر سیال مطالعه شد. برای این منظور، هوای فشرده داغ با نرخ جریان 25 لیتر بر دقیقه موجب برخورد ماسه سیلیسی داغ (700 درجه سانتی‌گراد) آغشته به 0/5 درصد وزنی نمک‌های کلریدی به نمونه‌ها به‌مدت 250 ساعت شد. با حذف عامل ساینده، رفتار اکسیداسیون دما‌بالای این آلیاژها نیز در اتمسفرهای هوا و هوا+کلر به‌مدت 100 ساعت در دماهای 520 و 560 درجه سانتی‌گراد بررسی شد. اندازه‌گیری افزایش وزن در اکسیداسیون و کاهش ضخامت در اکسیداسیون فرسایشی آلیاژها نشان داد که افزایش مقدار مولیبدن با کاهش سینتیک تشکیل لایه اکسیدی سطحی باعث بهبود مقاومت اکسیداسیون آلیاژ شد، اما در شرایط اکسیداسیون و سایش همزمان، نرخ اکسیداسیون کم آلیاژ حاوی 7 درصد وزنی مولیبدن منجر به زدوده شدن سریع لایه اکسیدی محافظ و کاهش مقاومت اکسیداسیون فرسایشی آلیاژ شد. تحت این شرایط نمونه حاوی 3 درصد وزنی مولیبدن کمترین نرخ زدایش را نشان داد. بررسی‌های میکروسکوپی و پراش پرتو ایکس تشکیل لایه‌های اکسیدی Cr2O3/NiCr2O4 را نشان داد. نمونه فاقد مولیبدن با کمترین مقاومت اکسیداسیون، تحت شرایط اکسیداسیون فرسایشی مقاومت بهتری از آلیاژهای با مولیبدن بالا نشان داد. با این‌حال نرخ اکسیداسیون بالا در این آلیاژ منجر به فقیر شدن شدید ناحیه زیرسطحی از عنصر کروم و اکسیداسیون داخلی آلیاژ شد.    

کلیدواژه‌ها


عنوان مقاله [English]

High Temperature Erosion- Oxidation Behavior of Nickel- Based Alloys Containing Mo in Fluidized Bed Waste Incineration

نویسندگان [English]

  • M. Emami 1
  • S. Hayashi 2
1 Division of Materials Engineering, University of Bonab, Bonab, Iran.
2 Division of Materials Science and Engineering, Hokkaido University, Sapporo, Japan.
چکیده [English]

High-temperature erosion-oxidation behavior of nickel-based alloys containing 0-7 wt.% Mo in fluidized bed waste incineration conditions was studied. A stream of hot condensed air with a flow rate of 25 L/min caused hot silica sand (700 °C) mixed with 0.5 wt.% of chloride salts to hit the specimens for 250 h. By removing the erosive factor, the high-temperature oxidation behavior of the alloys in air and air-chlorine atmospheres was studied at 520 and 560 °C for 100 h. Mass gain measurement due to oxidation followed by thickness loss measurement in the erosion-oxidation tests showed that an increased Mo content led to improved oxidation resistance as a result of reduced scaling rate. However, under simultaneous oxidation and erosion conditions, the lower oxidation rate of the alloy with 7 wt.% Mo caused rapid removal of the protective scale and a reduction in erosion-oxidation resistance of the alloy. Under these conditions, the alloy with 3 wt.% Mo showed the smallest removal rate. Microscopic observations and XRD analysis confirmed formation of Cr2O3/NiCr2O4 scales on the surface.  Mo-free alloy with lowest oxidation resistance showed a higher erosion-oxidation resistance. However, the high oxidation rate of this alloy led to a severe Cr-depletion and internal oxidation in subsurface region.

کلیدواژه‌ها [English]

  • High-temperature erosion-oxidation
  • Ni-based alloy
  • Element molybdenum
  • Fluidized bed incineration
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