Al-Si3N4Toz Metal Kompozit Malzeme Üretimi ve Aşınma Davranışının Araştırılması

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 αSi3N4 takviyeli kompozitlerin daha iyi aşınma direncinde sahip olduğunu göstermektedir. En yüksek aşınma direnci ve sertlik değerleri ağırlıkça % 15 silisyum nitrür içeren kompozit malzemede görülmüştür.

Production of Al-Si3N4 Powder Metal Composite Material and Investigation of Wear Behavior

Aluminum and its alloys as a structural materials are preferred in many fields, especially in the automotive and aerospace sectors. Conversly to many superior properties of aluminum and its alloys the fact that its properties such as hardness and wear resistance are far from the expectations in some applications makes the production of aluminum matrix composite materials more valuable and necessary. In this study, it is aimed to determine the effect of Si3N4 ratio on wear behavior of aluminum matrix composite material produced by powder metallurgy method. Mixed aluminum powders containing 5 %, 10% and 15% by weight α-Si3N4 were pressed in the die under 500 MPa pressure and 10 mm diameter and 15 mm length block samples were produced. Then pressed samples were sintered in an atmosphere controlled tube furnace for 2 hours at 650 ° C. After the characterization study such as density and hardness measurements, dry sliding wear test all of the composite materials were performed by using pin-on-disk method. The tests were carried out on the TIRIBOMETER T10 / 20 abrasion tester according to ASTM G99-05. Dry sliding wear tests of composite were carried out under the different load (5-10-15 N) and at 1.41 m/s sliding speed for 2000 m wear distance. Wear test results showed that composite materials containing silicon nitride at different ratio have better wear resistance according to matrix powder metal parts produced under the same conditions. The highest wear resistance and hardness values were seen at composite materials.Araştırma

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