Author :
Abstract
Bu çalışmada endüstride yaygın bir kullanım alanına sahip olan kürsel grafitli dökme demirin yüzeyinde NbC, FeAl ve NbC-FeAl kaplamaların termokimyasal difüzyon yöntemlerle ile oluşturulması çalışılmıştır. Bu amaçla GGG-80 numuneleri 900 ℃’de 2 saat süre ile Fe-Nb, Al tozu ve bu iki tozun karışımından oluşan bir kaplama tozu ile difuzyona maruz bırakılmıştır. Kaplamaların karakterizasyonu optik mikroskop, X-ışını kırınımı ve mikrosertlik testleri ile gerçekleştirilmiştir. Optik incelemeleri sonucunda almünyumlama, niyobyumlama ve alüminyumlama-niyobyumlama işlemleri sonucunda yüzeyde sırasıy 285 µm, 5 µm ve 45µm kalınlığında kaplama tabakaları elde edildğini göstermiştir. X-ışınları analizleri Almünyumlam ile FeAl, niyobyumlama ile NbC ve alüminyumlama-niyobyumlama işlemleri sonucunda baskın fazın FeAl olmakla birlikte düşük miktarda NbC fazlarının varlığını göstermiştir.
Keywords
Abstract
Abstract
In this study, NbC, FeAl and NbC-FeAl coatings were growth on the surface of spheroidal graphite cast iron, which has a widespread use in the industry, by thermochemical diffusion methods. For this purpose, GG-80 samples were exposed to diffusion heat treatment with Fe-Nb, Al powder and a coating powder consisting of a mixture of these two powders at 900 °C for 2 hours. Characterization of the coatings was carried out by optical microscope, X-ray diffraction and microhardness testing’s. As a result of optical examinations, it has been shown that as a result of aluminizing, niobizing and aluminizing-niobizin processes, 285 µm, 5 µm and 45 µm thick coating layers are growth on the surface, respectively. X-ray analyzes showed the presence of FeAl with alümizing, NbC with niobizing, and FeAl as the dominant phase as well as minor amount of NbC in aluminizing-niobinizing processes formed.
Keywords
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