ساخت و مشخصه‌یابی ریزساختار و خواص مکانیکی نانوکامپوزیت بر پایه آلیاژ NiCrAlY تقویت‌ شده با ذرات Si3N4 به روش تف‌جوشی پلاسمای ‌جرقه‌ای

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی مالک‌اشتر، اصفهان، ایران

چکیده

در پژوهش حاضر، تأثیر افزودن Si3N4 بر ریزساختار، سختی و ضریب اصطکاک و نرخ سایش آلیاژ NiCrAlY بررسی‌ شده است. خصوصیات ساختاری و مکانیکی نمونه‌های تولیدی توسط میکروسکوپ الکترونی روبشی، دستگاه پراش‌سنج پرتو ایکس، دستگاه سختی‌سنجی ویکرز ارزیابی شد. ابتدا پودر  Si3N4 به مقادیر 1، 3 و 5 درصد وزنی با پودر NiCrAlY به مدت 2 ساعت در آسیاب مکانیکی با یکدیگر مخلوط شدند؛ در ادامه مخلوط‌های پودری در دمای 1100 درجه سانتی‌گراد تحت عملیات تف‌جوشی پلاسمای‌جرقه‌ای (SPS)، قرار گرفتند. نتایج حاصل از الگوی پراش‌ پرتو ایکس، نشان می‌دهد نمونه‌های تولیدی از دو فاز محلول جامد Ni(Cr)-γو ترکیبات بین فلزی NiAl-β تشکیل ‌شده است. نتایج سختی‌سنجی نشان می‌دهد که با افزودن 1 درصد Si3N4 به NiCrAlY، سختی نمونه از 418 به 614 ویکرز افزایش می‌یابد. همچنین، نمونه مقاومت به سایش (mg/m)10-5×1/42 از خود نشان می‌دهد؛ اما با افزایش درصد وزنی Si3N4 در نمونه 1 به 5 درصد وزنی، سختی از 614 به 543 ویکرز کاهش می‌یابد. 

کلیدواژه‌ها

عنوان مقاله [English]

FABRICATION AND CHARACTERIZATION OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NANOCOMPOSITES BASED ON NICRALY ALLOY REINFORCED WITH SI3N4 PARTICLES BY SPARK PLASMA SINTERING METHOD

نویسندگان [English]

  • R. Zarei
  • E. Mohammadsharifi
  • M. R. Loghman
  • M. Ramazani
  • Kh. Zamani
Department of Materials Engineering, Malek Ashtar University of Technology, P.O. Box, 83145/115, Shahin Shahr, Isfahan, Iran
چکیده [English]

The present research has examined the effect of adding Si3N4 on the mechanical and structural properties of NiCrAlY alloy. The structural and mechanical properties of the manufactured samples were characterized by SEM, XRD,  micro-hardness evaluation and pin on disk wear test. Various concentrations of Si3N4 powder (1, 3, and 5 wt.%) were mixed with NiCrAlY powder using a mechanical ball mill. Next, the mixtures were sintered at 1100 °C using the spark plasma sintering (SPS) technique. The XRD patterns indicated that the samples were composed of two phases of solid solution γ-Ni(Cr) and intermetallic compounds β-NiAl. The results of micro-hardness measurements showed that adding 1% Si3N4 to NiCrAlY enhanced the hardness from 418 to 614 HV. However, with an increase in the Si3N4 content from 1 to 5 wt%, the hardness diminished from 614 to 543 HV, and by Adding Si3N4 to the NiCrAlY, its tribological properties were significantly improved.

کلیدواژه‌ها [English]

  • NiCrAlY nanocomposite
  • Spark plasma sintering
  • Si3N4

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مواد پیشرفته در مهندسی
دوره 41، شماره 1
خرداد 1401
صفحه 37-58

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