Investigation of tribological properties of hexagonal boron nitride reinforced AZ91 magnesium composites produced by powder metallurgy

Öz

In this study, homogeneous composite material mixtures were made by supplementing AZ91 magnesium alloy and AZ91 alloy with 10% by weight hBN (hexagonal boron nitride) nanoparticles. The prepared powders were pressed by cold pressing method with 400 MPa pressure and sintered at 590 °C in argon atmosphere. Microstructures of the prepared samples were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. The hardness values of the samples were taken from 5 different points during the 20 second loading time and the average hardness values were determined by taking the average of these hardness values. Wear tests were carried out in a pin-on-disc test device at different load values (5 N, 10 N and 15 N) at a total sliding distance of 300 meters, at a sliding speed of 50 mm/sec and in dry conditions. The friction coefficient values and the weight losses as a result of wear were examined. As a result of the experiments, it was seen that the hBN additive brought much higher hardness values on the AZ91 alloy. In the same wear tests, the hBN additive provided a wear-resistant composite.

Anahtar Kelimeler

• AZ91 Magnesium Alloy
• Powder Metallurgy
• Hexagonal Boron Nitride
• Wear
• Microstructure

Toz metalurijisi ile üretilen hegzagonal bor nitrür takviyeli AZ91 magnezyum kompozitlerin tribolojik özelliklerinin incelenmesi

Öz

Bu çalışmada, AZ91 magnezyum alaşımı ve AZ91 alaşımına ağırlıkça %10 hBN (hegzagonal bor nitrür) nanoparçacıkları takviye edilerek homojen kompozit malzeme karışımları yapıldı. Hazırlanan tozların soğuk presleme yöntemiyle 400 MPa basınç ile preslenmesi ve 590 C° sıcaklıkta argon atmosferinde sinterlemeleri gerçekleştirildi. Hazırlanan numunelerin mikroyapıları taramalı elektron mikroskobu (SEM) ve enerji dağılımlı X-ışınları (EDX) analizleri ile incelenmiştir. Numunelerin 20 saniye yükleme süresinde 5 farklı noktadan sertlik değerleri alındı ve bu sertlik değerlerinin ortalaması alınarak ortalama sertlik değerleri belirlendi. Aşınma testleri pin-on-disk deney cihazında farklı yük değerlerinde (5 N, 10 N ve 15 N) toplam 300 metre kayma mesafesinde, 50 mm/sn kayma hızında ve kuru şartlarda yapıldı. Sürtünme katsayısı değerleri ile aşınma sonucundaki ağırlık kayıpları incelendi. Yapılan deneyler sonucunda hBN katkısının AZ91 alaşımı üzerinde sertlik değerinde çok daha yüksek değerleri getirdiği görülmüştür. Yine aynı şekilde yapılan aşınma deneylerinde de hBN katkısı aşınmaya dirençli bir kompozit elde edilmesini sağlamıştır.

Anahtar Kelimeler

• AZ91 Magnezyum Alaşımı
• Hegzagonal Bor Nitrür
• Toz Metalurijisi
• Kompozit
• Triboloji

Kaynakça

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