Investigation of Crystal Structure and Mechanical Properties of Electrochemically Deposited Ni-B/TiB2 Composite Coatings

Öz

In this study, Ni-B alloy mainstructure and TiB2 micro particle supported composite coating was deposited in a Watts type nickel bath on a stainless steel substrate. The properties of the composite microhardness, morphology and wear resistance analysis were executed in order to determine the effect of reinforcement particles. According to the results, it was seen that reinforcement particles cause changes on the crystal structure compared to pure nickel and Ni-B alloy. In addition, micro TiB2 particles caused an increase in hardness. The particles resulted in an increase in micro hardness of about 225% compared to stainless steel and about 115% compared to pure nickel, while it resulted in an increase of about 60% compared to the Ni-B alloy. It has been observed that the morphology of the composite coating was also quite different from other coatings, but has a generally smooth surface. In addition, it was understood from the analysis results that the wear resistance of the composite coating was better compared to the pure nickel and Ni-B alloy coatings.

Anahtar Kelimeler

• Electrodeposition
• Composite coating
• Microhardness
• Wear
• Ni-B alloy

Elektrokimyasal Depolama Yöntemi ile AISI 304 Çeliği Yüzeyine Biriktirilen Ni-B/TiB2 Kompozit Kaplamaların Kristal Yapı ve Bazı Mekanik Özelliklerinin İncelenmesi

Öz

Bu çalışmada, Watts tipi nikel banyosunda Ni-B alaşım anayapılı ve TiB2 mikro parçacık takviyeli kompozit kaplama, paslanmaz çelik altlık üzerine depolanmıştır. Elde edilen kompozit kaplamanın özellikleri saf nikel ve Ni-B alaşım kaplamalar ile mukayese edilerek incelenmiştir. Takviye parçacıkların etkisini belirlemek amacıyla kristal yapı, mikrosertlik, morfoloji ve aşınma dayanımı analizleri yapılmıştır. Elde edilen sonuçlara göre takviye parçacıkların, saf nikel ve Ni-B alaşımına göre kristal yapı üzerinde değişime neden olduğu görülmüştür. Ayrıca mikro TiB2 parçacıklar sertlikte de artışa sebep olmuştur. Parçacıklar mikro sertlikte, paslanmaz çeliğe göre %225, saf nikele göre %115 civarında artışa sebep olurken, Ni-B alaşımına kıyasla yaklaşık %60 civarında bir artışla sonuçlanmıştır. Kompozit kaplamanın morfolojisinin de diğer kaplamalardan oldukça farklı olduğu, fakat genel olarak düzgün bir yüzeye sahip olduğu görülmüştür. Ayrıca, kompozit kaplamanın aşınma dayanımının saf nikel ve Ni-B alaşım kaplamalarına kıyasla daha iyi olduğu analiz sonuçlarından anlaşılmıştır.

Anahtar Kelimeler

• Elektrodepolama
• Kompozit kaplama
• Mikrosertlik
• Aşınma
• Ni-B alaşım

Kaynakça

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