نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، مهندسی ساخت و تولید،گروه مهندسی ساخت و تولید، واحد تبریز، دانشگاه آزاد اسلامی، تبریز.

2 استادیار، مهندسی مواد، گروه مهندسی ساخت و تولید، واحد تبریز، دانشگاه آزاد اسلامی، تبریز.

10.22068/jstc.2019.107254.1545

چکیده

پلی تترا فلورو اتیلن (تفلون) به دلیل خواص منحصر به فرد کاربرد بسیار زیادی بعنوان زمینه در کامپوزیتهای زمینه پلیمری دارد. در این تحقیق به تاثیر افزودن ذرات زیرکونیا بر نرخ سایش و ضریب اصطکاک تفلون خالص پرداخته شده است. برای این منظور نمونه‌های کامپوزیتی با افزودن 5 الی 30 wt.% زیرکونیا به زمینه تفلون دارای 10 wt.% گرافیت ساخته شد. ساخت نمونه ها به روش پرس سرد و پخت با استفاده از استاندارد 4745 وASTM D4894 صورت پذیرفت. برای بررسی مقاومت به سایش نمونه‌ها آزمایش پین روی دیسک چرخان مطابق استاندارد ASTM G99 انجام شد. در نهایت سختی نمونه ها با استفاده از استاندارد ASTM D2240 (Shore D) بدست آمد. برای بررسی توزیع ذرات فاز ثانوی و همچنین بررسی محل سائیده شده پس از تست سایش از میکروسکوپ الکترونی روبشی استفاده شد. کمترین نرخ سایش و ضریب اصطکاک به همراه بیشترین سختی در نمونه دارای 20wt.% زیرکونیا حاصل گردید. این نمونه تقریبا 3 برابر نرخ سایش کمتر و 12% سختی بیشتر نسبت به تفلون خالص نشان داد. این بهبود خواص در نتیجه ارتقاء توان حمل بار در نمونه‌های کامپوزیتی به دلیل وجود ذرات زیرکونیا در زمینه پلیمری حاصل شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of the zirconia particles incorporation effects on the wear resistance and hardness of polytetrafluoroethylene

نویسندگان [English]

  • Mohammad Mollazadeh 1
  • Reza Arghavanian 2

1 Department of Manufacturing Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

2 Department of Manufacturing Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

چکیده [English]

Polytetrafluoroethylene (Teflon) is one of the most widely used materials as the matrix in polymer-matrix composites due to its unique properties. In this study, the effect of zirconia particles addition on the wear rate and friction coefficient of pure Teflon has been investigated. For this, composite samples were manufactured by adding of 5 to 30wt.% zirconia into the PTFE matrix containing 10wt% graphite. Production of the samples were done by cold press and sintering method according ASTM D4894 and 4745 standards. To evaluate the wear resistance of the samples, pin on disk test was performed according to ASTM G99 standard. Finally, the hardness of the samples was measured using ASTM D2240 (Shore D) standard. The scanning electron microscope was applied to investigate the distribution of second phase particles and worn surfaces of the samples. The lowest wear rate and friction coefficient and the highest hardness were obtained for the sample containing 20wt.% zirconia. This sample had approximately 3 times lower wear rate and 12% higher hardness with respect to pure PTFE. This improvement is due to the higher load carrying capability of composite samples as a result of zirconia particles incorporation in the polymer matrix.

کلیدواژه‌ها [English]

  • Polymer-matrix composites
  • Polytetrafluoroethylene
  • Zirconia
  • Wear resistance
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