Effect of hot pressing temperature and reinforcement ratio on the properties of aluminium-B4C composites

Öz

In this study, the production of aluminium matrix B4C-reinforced composites by hot pressing was investigated. For this purpose, composite materials containing 5%, 10% and 15% B4C were produced by hot pressing at 500 °C and 550 °C. The produced samples were characterised by microstructure, hardness, electrical conductivity, wear and potentiodynamic polarisation analyses. It was observed that increasing the hot pressing temperature reduced the porosity and resulted in denser structures. It was determined that the reinforcement element agglomerated in the composite material containing 15% B4C. In general, it was observed that hardness and wear resistance increased with increasing reinforcement content, while electrical conductivity decreased. In terms of corrosion properties, it was concluded that the presence of 5% and 10% B4C improves corrosion resistance.

Anahtar Kelimeler

• Hot pressing
• Aluminium matrix composite
• Wear
• Corrosion.

Sıcak presleme yöntemiyle üretilen alüminyum matrisli B4C takviyeli kompozitlerin özelliklerine sıcak presleme sıcaklığının ve takviye oranının etkisi

Öz

Bu çalışmada alüminyum matrisli B4C takviyeli kompozitlerin sıcak presleme yöntemiyle üretimi araştırılmıştır. Bu amaçla 500 °C ve 550 °C’de %5, %10 ve %15 B4C içeren kompozit malzemeler sıcak presleme yöntemiyle üretilmiştir. Üretilen numuneler mikroyapı, sertlik, elektriksel iletkenlik, aşınma ve potansiyodinamik polarizasyon incelemeleriyle karakterize edilmiştir. Artan sıcak presleme işleminin gözenek oranını azalttığı ve daha yoğun yapıların oluşmasını sağladığı görülmüştür. %15 B4C içeren kompozit malzemede takviye elemanının topaklandığı belirlenmiştir. Genel olarak artan takviye elemanıyla birlikte sertliğin ve aşınma direncinin yükseldiği, elektriksel iletkenliğin ise azaldığı gözlenmiştir. Korozyon özellikleri açısından ise %5 ve %10 B4C varlığının korozyon direncini geliştirdiği sonucuna varılmıştır.

Anahtar Kelimeler

• Sıcak presleme
• alüminyum matrisli kompozit
• aşınma
• korozyon

Kaynakça

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