نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه تبریز، تبریز، ایران

2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه تبریز، تبریز، ایران

چکیده

چرخدنده‌های نانوکامپوزیتی بر پایه آمیخته پلی آمید 6-پلی پروپیلن (با نسبت وزنی 33/67 PA6/PP) محتوی نانوذرات کربنات کلسیم (5/2 تا 10 قسمت وزنی) و سازگارکننده PP-g-MAH (5 قسمت وزنی) به روش قالب‌گیری تزریقی تولید شد. شکل شناسی نمونه‌ها با میکروسکوپ الکترونی روبشی مطالعه شد. با استفاده از یک دستگاه آزمون دوام چرخدنده، مقدار سایش و دمای سطحی دندانه‌ها و همچنین عمر کاری چرخدنده‌ها تحت دو گشتاور خروجی 9/8 و  Nm8/14 اندازه‌گیری شد. در همه آزمایش‌ها، مقادیر دما و سایش برای چرخدنده محرک بیشتر از چرخدنده متحرک بود. به‌کارگیری 5/2 و 5 قسمت وزنی نانو ذرات، باعث کاهش دما و سایش چرخدنده‌ها شد. مقدار سایش در چرخدنده‌های حاوی 5/2 قسمت وزنی از نانو ذرات کربنات کلسیم تحت گشتاورهای 9/8 و Nm 8/14 به‌ترتیب حدود 60 و 83 درصد کمتر از چرخدنده‌های پلی آمیدی خالص مشاهده شد. حداکثر عمر تحت گشتاور Nm 8/14 (حدود 63 هزار دور)، در چرخدنده‌های نانوکامپوزیتی محتوی 5/2 قسمت وزنی از نانو کربنات کلسیم مشاهده شد که این مقدار تقریبا 200 درصد  بیشتر از عمر چرخدنده‌های پلی آمیدی خالص (حدود 21 هزار دور) بود. افزایش دوام چرخدنده‌های پایه پلیمری در اثر وجود نانوذرات کربنات کلسیم را می‌توان به بهبود مقاومت خمشی، سایشی و گرمایی دنده‌ها نسبت داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental studies on the durability of PA6-PP-CaCO3 nanocomposite gears

نویسندگان [English]

  • Rasool Mohsenzadeh 1
  • Karim Shelesh-Nezhad 2

1 Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran

2 Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran

چکیده [English]

Nanocomposite gears based on Polyamide 6/Polypropylene (PA6/PP 67/33) blend containing 2.5 to 10 phr of nano-CaCO3 and 5 phr of maleated polypropylene (PP-g-MAH) as compatibilizer were produced by injection molding. The morphology was studied using scanning electron microscopy. The wear and temperature of gears teeth as well as gears working lives were characterized by employing a gear test rig under two different output torques including 8.9 and 14.8 Nm. In all experiments, the teeth’s temperature and wear values for driver gear were higher as compared to those of driven gear.  The incorporation of 2.5 and 5 phr nano-CaCO3, led to the reduction of temperature and wear rate of gears. The wear rates of gears containing 2.5 phr of nano-CaCO3, under the torque of 8.9 and 14.8 Nm, were 60 and 83% lower than those of neat PA6 gears respectively. The maximum gear life under the torque of 14.8 Nm (63000 revolutions) was observed in nanocomposite gears containing 2.5 phr of nano-CaCO3 which was nearly 200% higher than that of neat PA6 gears (21000 revolutions). The raise of Polymer based gears performances as a result of CaCO3 nanoparticles inclusion may be attributed to the improvements of gear teeth flexural, wear and heat resistance

کلیدواژه‌ها [English]

  • Nanocomposite
  • Polyamide 6
  • Polypropylene
  • Nano-CaCO3
  • gear life

 

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