Determination of mechanical and tribological performance of polyamide-6 composites with wollastonite and kaolin filler

Abstract

In this experimental study, mechanical and tribological behaviors of unfilled polyamide-6 (PA-6) polymer, 10wt.% of wollastonite and 10wt.% kaolin filled polyamide-6 based polymer composites have been studied. Polyamide-6 based polymer composites are produced in granular form on an industrial twin screw extruder machine. The mechanical and tribological test samples used in the experiments were molded using a conventional type an injection molding machine. The wear and friction behaviors of unfilled PA-6 polymer and PA-6 composites were carried out in the pin-disc wear device and under dry sliding conditions. Wear and friction behaviors were performed at a sliding speed of 0.5 m/s and under the loads of 60N, 120N and 180N. As a result of the study, when wollastonite and kaolin additives are added to the PA-6 based polymer, tensile strength and elastic modulus values of composite materials increase while coefficient of friction and specific wear rate values decrease. In addition, both coefficient of friction and specific wear rate values of all materials used decreased with the increase in applied load in tribological tests.

Keywords

• Polyamide-6,wollastonite,kaolin,friction,wear,mechanical properties

Vollastonit ve kaolin katkılı poliamid-6 esaslı kompozitlerin mekanik ve tribolojik performanslarının belirlenmesi

Abstract

Bu çalışmada, katkısız poliamid 6 (PA-6) ile ağırlık olarak ayrı ayrı %10 oranında vollastonit ve kaolin katkılı poliamid-6 esaslı polimer kompozitlerin mekanik ve tribolojik özellikleri incelenmiştir. Poliamid-6 esaslı polimer kompozitler, endüstriyel tip ikiz vidalı bir ekstrüder makinesinde granül formda üretilmiştir. Deneylerde kullanılan mekanik ve tribolojik test numuneleri geleneksel enjeksiyon makinesi kullanılarak basılmıştır. Katkısız PA-6 ve PA-6 kompozitlerin aşınma ve sürtünme davranışları pim-disk aşınma cihazında ve kuru kayma şartları altında gerçekleştirilmiştir. Aşınma ve sürtünme davranışları 0.5m/s kayma hızında ve 60N, 120N ve 180N yükler altında yapılmıştır. Çalışma sonucunda, PA-6 polimerine ilave edilen vollastonit ve kaolin katkılar, kompozit malzemelerin çekme dayanımı ve elastiklik modülünü değerlerini artırırken sürtünme katsayısı ve spesifik aşınma hızı değerlerinin azalmasına sebep olmuştur. Buna ilave olarak, tribolojik deneylerde uygulanan yükün artması ile tüm malzemelerin hem sürtünme katsayısı hem de spesifik aşınma hızı değerleri azalmıştır.

Keywords

• Poliamid 6,vollastonit,kaolin,sürtünme,aşınma,mekanik özellikler

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