YÜKSEK ENERJİLİ ÖĞÜTME İLE ÜRETİLEN Al2O3 TAKVİYELİ CU KOMPOZİTLERDE PARÇACIK BOYUTUNUN ETKİSİ

Year 2023, , 125 - 134, 31.08.2023

Kerim Emre Öksüz

https://doi.org/10.54365/adyumbd.1287821

Abstract

Farklı tane boyutuna sahip alüminyum oksit (Al2O3) parçacıklarıyla güçlendirilerek, mekanik alaşımlandırılmış bakır (Cu) matris malzemeler yüksek enerjili öğütme işlemi ile başarılı bir şekilde üretilmiştir. Başlangıç malzemeleri, 10 µm ve 1 µm arasında değişen parçacık boyutlarına sahip ağırlıkça % 0,5 ticari Al2O3 tozları ve inert gaz atomize küresel elektrolitik Cu tozlarından oluşmaktadır. Farklı tane boyutlarına sahip Al2O3 ve Cu tozları, Cu matrisinde homojen bir Al2O3 dağılımı elde etmek için 500 rpm'de 3 saat boyunca yüksek enerjili öğütme işlemine tabi tutulmuştur. Öğütülen tozlar daha sonra 500 MPa basınçta soğuk preslenmiş ve 880°C'de 1,5 saat süreyle izotermal koşullar altında argon atmosferinde sinterlenmiştir. Üretilen bakır kompozit malzemeler, X-ışını kırınım analizleri (XRD), yüksek alan emisyon taramalı elektron mikroskopu (FEG-SEM), enerji dağılımlı X-ışını spektroskopisi (EDS), yoğunluk ve makro-sertlik testleri kullanılarak karakterize edilmiştir. Aşınma özelliklerini araştırmak için disk üstünde pim tribometre kullanılarak tribolojik testleri yapılmıştır. Deneysel sonuçlar, ince dağılmış Al2O3 partiküllerinin Cu matrisine dâhil edilmesinin, kaba Al2O3 partiküllerinden daha önemli bir güçlendirme etkisine sahip olduğunu göstermiştir.

Keywords

Al2O3 partikülleri, Bakır kompozit, Karakterizasyon, Yüksek enerjili öğütme, Toz metalurjisi

Al2O3 PARTICLE SIZE EFFECT ON REINFORCED CU COMPOSITES PRODUCED BY HIGH ENERGY MILLING

Abstract

Production of copper (Cu) composites with a reinforced Cu matrix using mechanical alloying with Aluminum oxide (Al2O3) particles of different sizes was achieved using high-energy ball milling procedure. The initial materials consisted of inert gas-atomized spherical electrolytic Cu powders containing 0.5 wt. % commercial Al2O3 powders, with particle sizes ranging from 10 µm to 1 µm. Cu powders with different particle sizes of Al2O3 were high-energy ball milled at 500 rpm for 3 hours to attain a consistent distribution of Al2O3 throughout in the Cu matrix. The powders that were high-energy ball milled were then subjected to cold-pressing at 500 MPa and isothermally sintered for 1.5 hours at 880°C in an Ar atmosphere. The fabricated copper composite materials were characterized using X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDXS), density and macrohardness tests. The wear properties and mechanism were investigated through tribological pin-on-disc experiments, which revealed that the reinforcing effect was more significant when finely dispersed Al2O3 particles were combined into the Cu matrix compared to coarse Al2O3 particles.

Keywords

Al2O3 particles, Characterization, Copper composite, High energy milling, Powder metallurgy

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