AL2024 Kompozitlerin Aşınma Karakteristiği

Öz

Kompozit malzemelerin geleneksel malzemelerle karşılaştırıldığında dayanıma bağlı olarak yoğunluk ve elastisite modülü özelliklerinin yüksek olması bu malzemelere talebi arttırmıştır. Ek olarak bu malzemelerin daha yüksek dayanım ve rijitliğe sahip olması, makine elamanının ağırlığının azalması anlamına gelmektedir. AL 2024 matrisli kompozit malzemelerin üretiminde kokil kalıba döküm yöntemi kullanılmış olup deneylerdeki aşınma ağırlık kaybı olarak ele alınmıştır. Bu çalışmada ağırlıkça %50 MgO ve %50 MWCNT karıştırılmış ve %0,2 - %0,5 - %1 - %2 oranlarında matris malzemesine ilave edilmiştir. MgO/MWCNT katkılı Al 2024 kompozitlerin sertlik ve aşınma davranışı Rockwell sertlik testiyle ball-on-disk aşınma test cihazı kullanılarak incelenmiştir. Elde edilen değerler karşılaştırılarak kompozit malzemelerin aşınma özellikleri üzerindeki etkileri ortaya konulmuştur. 5N yük etkisi altında 250 m mesafede aşınma deneyine tabi tutulan kompozit malzemenin ağırlık kaybı göz önünde bulundurularak yüzde aşınma miktarları incelenmiştir. Güçlendirici ilavasi ile kompozitlerin sertlik değerleri doğrusal olarak arttığı ve aşınma yüzdesi de aynı şekilde azaldığı gözlemlenmiştir. Güçlendirici ilavesi için en iyi oran ağırlıkça % 1 (50% MgO +50% CNT) karışımıdır.

Anahtar Kelimeler

• kompozit
• aşınma
• Al 2024
• karbon nanotüp (CNT)

Wear Characteristics of Carbon Nanotube Reinforced Al2024 Composites

Öz

Composite materials have high specific strength and modulus of elasticity compared to traditional materials, thus, the demand for these materials have increased nowadays. This means that, the weight of the machine component produced from these materials can be reduced. In this study, the mold casting method was used in the production of Al 2024 matrix composite materials. In sample production, 50% MgO and 50% MWCNT are mixed by weight and added to the matrix material in the ratio of 0.2% - 0.5% - 1% - 2%. The hardness and wear behaviors of Al 2024 composites with MgO / MWCNT additive were investigated using Rockwell tester and a ball-on-disc wear tester. The effects of composite materials on the wear properties have been investigated by determining the wear weight loss. 5N load and 250 m distance were chosen as the wear test parameters and percent wear amounts of the samples were examined. It was observed that Hardness values of samples increased and the wear percentage of specimens decreased with addition of reinforcement. The best ratio for the composite design is the mixing of 50 wt.% + MgO 50 wt.% CNT with 1 wt.%.

Anahtar Kelimeler

• metal matrix composite
• wear
• Al 2024
• carbon nanotube (CNT)

Kaynakça

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