بررسی تجربی رفتار سایش چرخ‌دنده‌های نانوکامپوزیتی بر پایه پلی‌استال

نوع مقاله : پژوهشی

نویسندگان

1 1- دانشگاه تبریز، دانشکده مهندسی مکانیک، گروه مهندسی ساخت و تولید، کد پستی 5166616471، 2- تهران، دانشگاه فنی و حرفه‌ای، گروه مهندسی مکانیک، صندوق 143576137

2 دانشگاه تبریز، دانشکده مهندسی مکانیک، گروه مهندسی ساخت و تولید، کد پستی 5166616471

چکیده

فرضیه: در این پژوهش، اثر به‌‌کارگیری نانوذرات دوده (CB) و کلسیم کربنات‌ رسوبی (NPCC) بر رفتار سایشی، گرمایی و شکل‌شناسی در چرخ‌دنده‌های نانوکامپوزیتی بر پایه پلی‌استال (POM) به‌طور تجربی مطالعه شد. پلی‌استال از جمله مواد مهندسی پرکاربرد برای ساخت چرخ‌دنده است. با‌ ‌وجود این، از ضعف‌های عمده آن مقاومت گرمایی و استحکام ضربه‌ای شکاف‌دار نسبتاً کم و حساسیت به پرتو فرابنفش است. افزودن نانوذرات دوده به پلی‌استال، می‌تواند به‌صورت هم‌زمان استحکام کششی و چقرمگی و مقاومت به پرتو فرابنفش پلی‌استال را افزایش دهد. 
روش‌ها: نمونه‌های چرخ‌دنده‌ای نانوکامپوزیتی بر پایه آمیخته پلی‌استال دارای %0.42 وزنی تقویت‌کننده نانوذرات دوده و  نانوذرات کلسیم کربنات‌ (1.5، 3 و %4.5 وزنی) با روش اکسترودر و قالب‌گیری تزریقی تولید شدند. بررسی شکل‌شناسی و مطالعه نانوساختار با آزمون‌های میکروسکوپی الکترونی پویشی انجام شد. عملکرد گران‌روکشسانی نانوکامپوزیت‌ها با آزمون دینامیکی مکانیکی گرمایی مطالعه شد. عملکرد چرخ‌دنده‌ای نانوکامپوزیت‌ها با دستگاه آزمون چرخ‌دنده، ارزیابی شد. در آزمون چرخ‌دنده، پارامترهای دما و سایش ارزیابی شدند. سطح سایش دنده در مرحله شکست با به‌کارگیری میکروسکوپ الکترونی پویشی بررسی شد و سازوکارهای سایش آن مطالعه شد.  
یافته‌ها: افزودن هم‌زمان هر دو نوع نانوذرات به پلی‌استال موجب کاهش مقدار سایش تا %58 نسبت به پلی‌استال خالص شد. دمای سطح دنده، در تعداد دور یکسان، با به‌کارگیری نانوذرات دوده و ‌کلسیم کربنات کاهش یافت. کاهش دمای سطح دنده در نمونه‌های نانوکامپوزیتی در مقایسه با نمونه پلیمری خالص، به‌ افزایش مدول ذخیره و بهبود رفتار کشسانی، کاهش نسبت میرایی (رفتار گران‌رو) و نیز کاهش ضریب اصطکاک و افزایش انتقال گرما با به‌کارگیری نانوذرات نسبت داده شد. به‌کارگیری %4.5 وزنی نانوذرات‌ کلسیم کربنات به‌همراه دوده، باعث ایجاد ترک و گسترش سایش خراشی و جریان مواد در بخش گام دنده شد. 

کلیدواژه‌ها

عنوان مقاله [English]

Experimental Study on Wear Behavior of Polyacetal Nanocomposite Gears

نویسندگان [English]

  • Rasool Mohsenzadeh 1
  • Karim Shelesh-Nezhad 2
  • Tajbakhsh Navid Chakherlou 2
1 Division of Plastics and Composites Engineering, Department of Mechanical Engineering, University of Tabriz, Postal Code 5166616471, Tabriz, Iran
2 Division of Plastics and Composites Engineering, Department of Mechanical Engineering, University of Tabriz, Postal Code 5166616471, Tabriz, Iran
چکیده [English]

Hypothesis: The effect of incorporation of carbon black nanoparticles (CB) and nano-precipitated calcium carbonate (NPCC) on wear behavior, thermal behavior and morphology in polyacetal (POM)-based nanocomposite gears has been studied. Polyacetal is one of the widely used engineering materials for manufacturing the gears. Nevertheless, heat resistance and relatively low crack impact strength and sensitivity to UV are the major disadvantage of POM. Adding carbon black nanoparticles into the polyacetal can simultaneously increase the tensile strength and toughness and increase the UV resistance of the polyacetal. In addition, the presence of NPCC in the POM/CB can lead to improvements in CB dispersibility, increase of wear and thermal resistance.
Methods: POM/CB/NPCC nanocomposite gears containing 0.42% (by wt) carbon black and different fractions (1.5%, 3% and 4.5% all by wts) of NPCC were produced by utilizing a twin-screw extruder and injection molding machine. Morphology and nanostructure were investigated by applying scanning electron microscopy. The gear performance of nanocomposites was examined by applying a gear test rig. Gear tests were performed in the mode constant loading. The temperature and wear of the gears were evaluated in the gear tests. 
Findings: The simultaneous addition of both types of nanoparticles to polyacetal led to a reduction in the amount of wear by 58% compared to pure polyacetal. The temperature of the gear surface, in the same number of revolutions, was reduced using CB and NPCC nanoparticles. The decrease in the temperature of the nanocomposite tooth surface compared to pure POM was attributed to the increase in storage modulus and improvement in elastic behavior, decrease in damping ratio, as well as decrease in friction coefficient and increase in heat transfer in presence of nanoparticles. The use of 4.5% (by wt) of NPCC nanoparticles caused cracks and expansion of wear and material flow in the gear pitch zone.

کلیدواژه‌ها [English]

  • Gear wear analysis
  • POM
  • carbon black
  • calcium carbonate
  • morphology

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مجله علوم و تکنولوژی پلیمر
دوره 36، شماره 2 - شماره پیاپی 184
خرداد و تیر 1402
صفحه 151-165

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