Si3N4 katkılı Al7075 matrisli kompozitlerin mikroyapısının ve tribolojik özelliklerinin incelenmesi

Yıl 2025, Cilt: 14 Sayı: 2, 1 - 1

Aleyna Taşkın , Elif Işık , Mahmut Can Şenel

Öz

Yapılan bu çalışmada toz metalürjisi ve sıcak presleme yöntemleriyle Al7075 matrise ağırlıkça %1, 3, 6, 9 ve 12 katkı oranlarında Si3N4 ilave edilerek kompozit malzemeler üretilmiştir. Üretilen kompozitlere yoğunluk, Vickers sertliği, aşınma ve sürtünme testleri uygulanmıştır. Ayrıca kompozitlerin mikroyapılarını incelemek amacıyla XRD, SEM ve SEM-EDX analizleri yapılmıştır. Sonuç olarak en yüksek deneysel yoğunluk (2.65 g/cm3), en yüksek Vickers sertliği (205 HV), en düşük aşınma oranı (0.00018 mm3/(Nm)), en düşük kütle kaybı (0.0025 g) ve en düşük sürtünme katsayısı (0.38) değerleri Al7075-%9 Si3N4 kompozitte elde edilmiştir. Ancak ağırlıkça %12 Si3N4 katkı oranında takviye partiküllerinin topaklanmasından dolayı kompozitin tribolojik özellikleri kötüleşmiştir. Sonuç olarak Al7075 matrise %9 Si3N4 katkısının kompozitin tribolojik özelliklerini iyileştirdiği tespit edilmiştir.

Anahtar Kelimeler

Al7075 alaşımı, Si3N4, Kompozit, Toz Metalürjisi

Investigation of microstructure and tribological properties of Si3N4 reinforced Al7075 matrix composites

Öz

In this study, composite materials were fabricated by Si3N4 reinforcement (1, 3, 6, 9, and 12wt.%) to the Al7075 matrix using the powder metallurgy and hot-pressing methods. Density, Vickers hardness, wear, and friction tests were applied to the fabricated composites. In addition, XRD, SEM, and SEM-EDX analyses were performed to examine the microstructures of the composites. As a result, the highest experimental density (2.65 g/cm3), the highest Vickers hardness (205 HV), the lowest wear rate (0.00018 mm3/(Nm)), the lowest mass loss (0.0025 g), and the lowest friction coefficient (0.38) values were obtained in the Al7075-9% Si3N4 composite. However, the tribological properties of the composite deteriorated due to the agglomeration of the reinforcement particles at the 12wt.% Si3N4 content. As a result, it was determined that 9% Si3N4 addition to the Al7075 matrix improved the tribological properties of the composite.

Anahtar Kelimeler

Al7075 alloy, Si3N4, Composite, Powder Metallurgy

Kaynakça

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