Al-Si3N4 Toz Metal Kompozit Malzeme Üretimi ve Aşınma Davranışının Araştırılması

Yıl 2019, Cilt: 7 Sayı: 4, 776 - 787, 24.12.2019

Halil Arık

https://doi.org/10.29109/gujsc.621116

Cited By: 2

Öz

Özet

Alüminyum ve alaşımları başta otomotiv ve
havacılık sektörü olmak üzere pek çok alanda tercih edilen metal ve alaşım
grubunu oluşturmaktadır.  Alüminyum
alaşımlarının üstün özellikleri yanında sertlik ve aşınma direnci gibi
özelliklerinin bazı uygulamalarda beklentilerin uzağında kalması alüminyum
matrisli kompozit malzeme üretimi çalışmalarını daha değerli ve gerekli
kılmaktadır. Bu çalışmada toz metalürjisi metodu ile üretilen α-Si₃N₄
içeren alüminyum matrisli kompozit malzemelerde takviye elemanı oranının
kompozitin aşınma davranışı üzerine etkilerinin belirlenmesi amaçlanmıştır.
Ağırlıkça %5, %10 ve %15 oranlarında α-Si₃N₄ içeren
karışım tozlar kalıp içerisinde 500 MPa basınç altında preslenerek 10 mm çapta
ve 15 mm boyda blok numuneler üretilmiştir. Daha sonra preslenen numuneler
atmosfer kontrollü tüp fırında 2 saat süreyle 650 °C sıcaklıkta
sinterlenmiştir. Toz metal kompozit parçaların yoğunluk ve sertlik ölçümleri sonrası
pin-on-disk metoduyla kuru kayma aşınma testleri yapılmıştır. Testler
TIRIBOMETER T10/20 aşındırma test cihazında ASTM G99-05’ göre yapılmıştır.
Aşındırma testleri 1,41 m/s kayma hızı ve 2000 m mesafede farklı yükler
(5-10-15 N) altında tekrarlanmıştır. Alınan aşınma test sonuçları aynı
şartlarda üretilen matris malzemeye göre değişik oranlarda α-Si₃N₄
takviyeli kompozitlerin daha iyi aşınma direncinde sahip olduğunu
göstermektedir. En yüksek aşınma direnci ve sertlik değerleri ağırlıkça % 15
silisyum nitrür içeren kompozit malzemede görülmüştür.

Anahtar Kelimeler

Toz Metalurjisi, Kompozit Malzeme, Al-Si3N4, Aşınma Davranışı

Kaynakça

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