5 results listed
In this experimental study, the tribological performance of 30wt.% short carbon fiber reinforced poly-ether-ketone
(PEEK+30%CF) high performance thermoplastic composite against a stainless steel (SS) and a high performance
thermoplastic polymer material such as 40wt.% glass fiber reinforced poly-phenylene-sulphite (PPS+40%GF)
composite materials under dry sliding condition were evaluated. Tribological tests were carried out on a pin-disc
wear test rig and under the sliding speed of 0.5 m/s and the applied pressures of 0.707, 1.41 and 2.12MPa
conditions. The results show that the friction coefficient for carbon fiber reinforced PEEK composite against
PPS+40%GF polymer composite and stainless steel materials increases slightly with the increment of applied
pressure values. Furthermore, the specific wear rate for carbon fiber reinforced PEEK composite against
PPS+40%GF composite increases but it decreases against stainless steel with the increment of applied pressure
values. Finally, the wear rates for carbon fiber reinforced PEEK polymer composite against PPS+40%GF
composite and stainless steel materials under dry sliding conditions are in the order of 10-14 and 10-15 m2/N,
respectively. The results suggested that PEEK+30%CF-stainless steel pair is the best material pair for use in
friction and wear applications in the study.
International Symposium on Light Alloys and Composite Materials
UHAKS
İrfan Akgül
Hüseyin Ünal
Abstract
In this experimental study, polypropylene (PP) based composites filled with up to 30 wt% chitosan mineral filler,
were prepared by extrusion and injection molding. Chitosan filler, with weight percentages varying between 10
and 30 wt%, were added to polypropylene polymer matrix. Uniaxial tensile, impact, hardness and three-point
bending tests were used to examine the effect of chitosan filler addition on the mechanical behavior of
polypropylene. Tensile strength, tensile modulus, elongation at break, hardness, impact energy and flexural
strength and flexural modulus were obtained. The results showed that the tensile strength, flexural strength, tensile
and flexural modulus of polypropylene composite material increased with the increment of filler weight ratio while
the impact strength and maximum elongation values decreased with the increase in chitosan filler weight ratio.
International Symposium on Light Alloys and Composite Materials
UHAKS
Erol Kılık
Hüseyin Ünal
In this experimental study, the tribological behaviour of polyamide-6 (PA-6) polymer, 10wt.%graphite filled
polyamide-6 (PA-6+10%G) composite, polyamide-6 with wax (PA-6+6%w) and both 10wt.% graphite and
6wt.%wax filled polyamide-6 (PA-6+10%G+6%W) composites against steel under dry sliding condition were
studied. Pin-on-disc wear test rig was used for the tribological tests. Friction and wear tests were studied at room
temperature. Tribological tests were done at the sliding speeds of 0.4, 0.8 and 1.6m/s and under the load of 100N.
As a disc material, AISI 316L stainless steel were used. The results show that the specific wear rates for all polymer
and polymer composites used against steel increases slightly with the increment of sliding speed values. In
addition, the coefficient of friction for polyamide-6 with wax polymer and graphite/wax filled polyamide-6
composite increase slightly, but it is decreases slightly with the increment of sliding speed for graphite filled
polyamide 6 composite. Finally, the specific wear rates for PA-6 polymer, PA-6+10%G composite, PA-6+6%W
and PA-6+10%G+6%W composite against steel under dry sliding conditions are in the order of 10-14, 10-14, 10-15
and 10-15 m2/N, respectively. The results suggested that it is more convenient to use PA-6+10%G+6%W composite
against steel for tribological applications in the study.
International Symposium on Light Alloys and Composite Materials
UHAKS
İrfan Akgül
Hüseyin Ünal
In this experimental study, the tribological performance of glass fiber reinforced poly-ether-ketone (PEEK)
composite against long glass fiber reinforced unsaturated polyester composite and steel under dry sliding condition
were evaluated. Wear tests were carried out on a pin-on-disc arrangement and under 0.707, 1.41 and 2.12 MPa
applied pressures and 0.5 m/s sliding speed condition. As a disc material, AISI 316L stainless steel and 20wt.%
glass
fiber
reinforced
and
15%
calcium
carbonate
(UPET+20%GF+15%CaCO3) composite were used. The results present that the coefficient of friction and wear
rates for 30wt.% glass fiber reinforced PEEK composite (PEEK+30%GF) against long glass fiber reinforced
unsaturated polyester composite and stainless-steel increases slightly with the increase in applied pressure values.
Finally, the wear rates for PEEK polymer composite against long glass fiber reinforced unsaturated polyester
composite and stainless steel under dry sliding conditions are in the order of 10-14 and 10-15 m2/N, respectively.
The results suggested that it is more convenient to use glass fiber reinforced poly-ether-ketone composite against
stainless steel for tribological applications.
International Symposium on Light Alloys and Composite Materials
UHAKS
İrfan Akgül
Hüseyin Ünal
Abstract
Bu deneysel çalışmada yüksek yoğunluklu polietilen (YYPE) ile farklı oranlarda (%5,%10 ve %15) çinko borat
(ZnBr) katkılı YYPE kompozitlerin tribolojik davranışları incelenmiştir. Aşınma ve sürtünme deneyleri, kuru
ortam, 23° oda sıcaklığında ve %50 nem şartlarında pim-disk aşınma cihazında gerçekleştirilmiştir. Deneyler 100N
yük altında ve üç farklı hızda (1.0 2 ve 3 m/s gibi) AISI 316L paslanmaz çelik disk malzemeye karşı 2000m
kayma yolunda yapılmıştır. Aşınma ve sürtünme deneyleri sonucunda deneylerde kullanılan polimer ve kompozit
malzemelerin sürtünme katsayıları ve spesifik aşınma oranları tespit edilmiştir. Deneylerde aşınma oranı ve
sürtünme katsayısına YYPE polimerine ilave edilen ZnBr katkı oranı ile birlikte kayma hızının etkisi de
araştırılmıştır. Deneylerde en yüksek aşınma oranı YYPE+%15ZnBr polimer kompozitinde tespit edilirken, en
düşük aşınma oranı ise saf YYPE polimerinde gözlenmiştir. YYPE polimer ve kompozit malzemelerin aşınma
yüzey incelemeleri ise optik mikroskop kullanılarak incelenmiştir.
International Symposium on Light Alloys and Composite Materials
UHAKS
Mehmet Kurt
Hüseyin Ünal
Münir Taşdemir
Samet Vardar