Investigation of Wear Performance of Different Amounts ZrO2 Reinforced Al-2Gr Matrix Composite Materials Produced by Mechanical Alloying Method

Year 2019, Volume: 6 Issue: 3, 594 - 605, 30.09.2019

İjlal Şimşek

https://doi.org/10.31202/ecjse.560741

Cited By: 2

Abstract

In this study, wear
behavior of composite materials produced by adding different amounts of ZrO₂
to Al-2Gr matrix by mechanical alloying method was investigated. After adding
2% (vol.) graphite to the aluminum matrix, 4 different amounts (3%, 6%, 9%, and
12%) of ZrO₂ were added. The mechanically alloyed composite powders
for 60 minutes were cold-pressed under 700 MPa pressure and green parts were
produced. The green parts produced were sintered at 600 °C under argon for 120 minutes. The sintered ZrO₂ reinforced
aluminum composite materials (AMCs) are characterized by the scanning electron
microscope, X-ray diffraction, and hardness and density measurements. Wear
tests were performed on a standard pin-on-disc wear testing device with three
different loads (10-20-30 N) at a sliding speed of 0.6 ms^-1 and four
different sliding distances (53, 72 and 94 m) according to ASTM G77
standard. As a result of the studies, the microhardness and density increases
as the amount of ZrO₂ in the composite material increases. As a
result of the wear tests, the highest weight loss was obtained in the non-reinforced
Al-2Gr matrix alloy, while the lowest weight loss was obtained in 12% ZrO₂
reinforced composite materials. However, it was observed that there was a
decrease in the friction coefficient with increasing amount of reinforcement.

Mekanik Alaşımlama Yöntemi ile Üretilen Farklı Miktarlarda ZrO2 Takviyeli Al-2Gr Matrisli Kompozit Malzemelerin Aşınma Performanslarının İncelenmesi

Abstract

Bu çalışmada,
mekanik alaşımlama yöntemi ile Al-2Gr matrise farklı miktarlarda ZrO₂ ilave
edilerek üretilen kompozit malzemelerin farklı yükler altında aşınma
performansı incelenmiştir. Alüminyum matrise hacimce %2 grafit ilave edildikten
sonra, 4 farklı miktarda (%3, %6, %9 ve %12) ZrO₂ ilave edilmiştir.
60 dakika süre ile mekanik alaşımlanan kompozit tozlar, 700 MPa basınçla soğuk
preslenerek green kompaktlar üretilmiştir. Üretilen green kompaktlar 600 °C
sıcaklıkta 2 saat sinterlenmiştir. Sinterlenen ZrO₂ takviyeli
alüminyum kompozit malzemeler, taramalı elektron mikroskobu, X-ışın kırınımı,
sertlik ve yoğunluk ölçümü ile karakterize edilmiştir. Aşınma testleri standart
blok on ring aşınma test cihazında 3 farklı yük altında (5, 10 ve 20 N), 0,6 ms^-1
kayma hızı ve üç farklı (53, 72 ve 94 m) kayma mesafesi
kullanılmıştır. Yapılan çalışmalar sonucunda, kompozit malzemelerin içerisinde
artan ZrO₂ miktarı ile sertlik ve yoğunlukları artmaktadır. Aşınma
testleri sonucunda, en yüksek ağırlık kaybı, takviyesiz Al-2Gr matris alaşımda
elde edilirken, en düşük ağırlık kaybı ise %12 ZrO₂ ilaveli kompozit
malzemelerde elde edilmiştir. Bununla birlikte artan takviye miktarı ile
sürtünme katsayısında ise azalma olduğu görülmüştür.

Keywords

Alüminyum matris kompozit, ZrO2, mekanik alaşımlama, aşınma

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