NiAl Bazlı Malzemelerin Kuru Kayma Aşınmasının İncelenmesi

Abstract

Bu çalışmada farklı uygulamalarda alternatif malzeme olarak düşünülen ve bu amaçla üzerinde çalışılan NiAl intermetaliği ve tok fazlar ile mukavemetlendirilmiş NiAl/Cr-Mo ve NiAl-Ti/Cr-Mo alaşımlarının çelik (AISI 52100) ve seramik (Al2O3) bilyelere karşı aşınma davranışları incelenmiştir. Deney numuneleri ark ergitme yöntemi ile üretilmiş ve ball on disk yöntemi ile kuru kayma koşullarında aşınma deneyleri yapılmıştır. Elde edilen bulgular sertlik ölçümleri, SEM incelemeleri ve EDX analizleri ile irdelenmiştir. Yapılan çalışmalar neticesinde çelik bilye kullanılan deneylerde belirlenen aşınma miktarının seramik bilyedekine göre çok daha fazla olduğu tespit edilmiştir. Malzemeler arasında ise her iki aşındırıcı bilye türünde de en fazla aşınma kaybı NiAl intermetaliğinde yaşanırken en düşük kayıplar Ti ilaveli ötektiğimsi NiAl/Cr-Mo alaşımında belirlenmiştir.

Keywords

• NiAl,intermetalik,aşınma,sertlik

Evaluation of Dry Sliding Wear Behavior of NiAl Base Materials

Abstract

In this study, the wear behaviour of NiAl intermetallic, NiAl/Cr-Mo pseudo-eutectic and NiAl-Ti/Cr-Mo alloys which is considered as alternative material in different applications were investigated. Wear tests were performed against steel (AISI 52100) and ceramic (Al2O3) balls. Test specimens were produced by arc melting method and abrasion tests were performed by ball on flat method under dry sliding conditions. Wear results were examined by hardness measurements, SEM investigations and EDX analyzes. As a result of the studies, it was found that the amount of abrasion loss determined in the experiments using steel balls was much higher than that of ceramic balls. Among the materials, the highest losses were seen in NiAl intermetallic in both abrasive balls, while the lowest losses were determined in Ti added pseudo-eutectic NiAl/Cr-Mo alloy.

Keywords

• NiAl; intermetallic; wear; hardness.

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