Akımsız nikel kaplama süresinin yeni tür dentritik bakır-nikel alaşım tozlarının özellikleri üzerine etkisi

Yıl 2023, Cilt: 12 Sayı: 3, 1013 - 1020, 15.07.2023

Onur Güler

https://doi.org/10.28948/ngumuh.1258122

Öz

Bu çalışmada, elektroliz yöntemi ile hurda bakır plakadan elde edilen dentritik bakır tozları üzerine akımsız nikel kaplama işlemi uygulanmıştır. 30 dk, 60 dk ve 90 dk sürelerinde akımsız nikel kaplama işlemleri uygulanarak elde edilen dentritik bakır-nikel bimetalik tozların morfolojik ve oksidasyon incelemeleri gerçekleştirilmiştir. Morfoloji incelemeleri taramalı elektron mikroskobu (SEM) ile yapılırken, oksidasyon direnci incelemeleri termogravimetrik analiz (TGA) yöntemi ile yapılmıştır. Elde edilen sonuçlara göre, akımsız nikel kaplama süresinin artması ile elektrolitik bakır parçacıklar üzerinde indirgenen nikel miktarı artmıştır. İndirgenen nikel tabaka nano boyutta parçacıklardan oluşmuştur. Akımsız nikel kaplama süresinin artışı ile parçacıkların oksidasyon direnci değerlerinde artış sağlanırken, oksitlenmeye başlama sıcaklıkları da arttırılmıştır. Ayrıca, nano nikel parçacıkların parçacık yüzeylerinde oluşturduğu tabaka ve birikintiler, elektrolitik bakır parçacıklarının yüzey alanı değerlerini yaklaşık %20 oranında arttırmıştır. Parçacık boyutu analizi sonuçlarına göre, akımsız nikel kaplama tabakası sayesinde ortalama parçacık boyutu değerleri artarak 1 µ’ye kadar bir kaplama tabakasının elde edildiği tespit edilmiştir.

Anahtar Kelimeler

Akımsız nikel kaplama, Dentritik bakır tozu, Oksidasyon direnci, Bakır-nikel alaşımı, Malzeme karakterizasyonu

Effect of electroless nickel plating time on the properties of novel dendritic copper-nickel alloy powders

Öz

In this study, electroless nickel plating process was applied on dendritic copper powders obtained from scrap copper plate by electrolysis method. Morphological and oxidation studies of dendritic copper-nickel bimetallic powders obtained by electroless nickel plating processes for 30 min, 60 min and 90 min were carried out. While morphology studies were performed with scanning electron microscopy (SEM), oxidation resistance studies were performed with thermogravimetric analysis (TGA). According to the results obtained, the amount of reduced nickel on electrolytic copper particles increased with the increase of electroless nickel plating time. The reduced nickel layer is composed of nano-sized particles. With the increase of the electroless nickel plating time, the oxidation resistance values of the particles increased, while the oxidation starting temperatures were also increased. In addition, the layers and deposits formed by the nano nickel particles on the particle surfaces increased the surface area values of the electrolytic copper particles by about 20%. According to the results of the particle size analysis, it was determined that a coating layer up to 1 µ was obtained by increasing the average particle size values thanks to the electroless nickel plating layer.

Anahtar Kelimeler

Electroless nickel plating, Dendritic copper powder, Oxidation resistance, copper-nickel alloy, Material characterization

Kaynakça

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