تحولات ریزساختاری و ترکیبی سیستم نیکل- مس بر حسب سرعت آسیاکاری حین فرآیند پوشش‌دهی مکانیکی سطح (SMC)

نوع مقاله : علمی و پژوهشی

نویسندگان

1 دانشگاه آزاد اسلامی، واحد قوچان

2 دانشگاه علم و صنعت ایران

چکیده

در دهه اخیر، عملیات پوشش‌دهی سطوح با استفاده از فرآیند آلیاژسازی مکانیکی که در این مقاله "پوشش‌دهی مکانیکی سطح (Surface Mechanical Coating (SMC))" معرفی شده است، به عنوان روشی نوین و بنیادی مورد توجه برخی از محققین قرار گرفته است. در تحقیق پیش رو، بررسی تاثیر پارامتر سرعت آسیاکاری بر فرآیند پوشش دهی مکانیکی سطح (SMC) در بازه 200 تا 500 دور بر دقیقه برای دو مدت زمان 20 و 60 ساعت آسیاکاری مدنظر واقع شده است. از آنجایی که افزایش سرعت آسیاکاری منجر به افزایش انرژی وارده به پودر و همچنین افزایش دمای محفظه می‌گردد، لذا تغییرات ریزساختاری و ترکیبی در پودر و پوشش اجتناب ناپذیر است. بدین منظور جهت بررسی‌های ساختاری و ترکیبی از آنالیز پراش اشعه ایکس، میکروسکوپ الکترونی روبشی و میکرو آنالیزر پروب الکترونی استفاده گردید. لازم به ذکر است که، به منظور انجام عملیات پوشش‌دهی، از پودر مس به همراه گلوله نیکل استفاده گردید و بررسی‌ها از چهار منظر مختلف مورد توجه قرار گرفت؛ سطح خارجی پودر و گلوله و سطح مقطع برشی پودر و گلوله. نتایج نشان داد که تکمیل تشکیل محلول جامد Cu-Ni برای نمونه‌های با مدت زمان 20 ساعت آسیاکاری، در سرعت 400 دور بر دقیقه و برای نمونه های با مدت زمان 60 ساعت آسیاکاری، در سرعت 300 دور بر دقیقه حاصل گردیده است. همچنین مشخص گردید که در نمونه با 60 ساعت آسیاکاری در سرعت 400 دور بر دقیقه ضخیم‌ترین پوشش (حدود 220 میکرومتر) حاصل گردیده است. ضمنا مکانیزم تشکیل پوشش حین فرآیند SMC با توجه به بررسی‌های میکروسکوپی استخراج گردید.

کلیدواژه‌ها

عنوان مقاله [English]

Microstructural and Compositional Evolution of Ni-Cu Solid Solution versus Mechanical Alloying Speed during Surface Mechanical Coating (SMC)

نویسندگان [English]

  • Iman Farahbakhsh 1
  • Alireza Zakeri 2
1 Department of Engineering, Quchan Branch, Islamic Azad University, Quchan, Iran
2 IUST
چکیده [English]

Recently, surface coating process by mechanical alloying method was considered as a new and fundamental method. The method in this paper was introduced as "surface mechanical coating (SMC)". In this research, effect of speed milling parameters on mechanical surface coating process in the range of 200 to 500 rpm for both 20 and 60 hour milling time was considered. Since the milling speed leads to increased energy and higher chamber temperature, then microstructural and compositional changes in the powder and coating are inevitable. X-ray diffraction, electron probe micro analyzer and scanning electron microscope were used to study the structure and composition properties. It should be mentioned that in this research copper powder and nickel ball were used as initial materials. The results showed that the completed formation of Cu-Ni solid solution was acquired after 20 hours of milling at 400 rpm and 60 hours of milling at 300 rpm. It was found that the thickest coating layer of about 220 µm was obtained after 60 hours of milling at 400 rpm. The solid solution formation mechanism during SMC process was extracted according to microscopic examination.

کلیدواژه‌ها [English]

  • Surface Mechanical Coating (SMC)
  • Speed of Mechanical Alloying
  • Cu-Ni Solid Solution
  • Ni Ball
  • Mechanical Diffusion

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