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Akımsız Kaplama Yöntemi ile CeO2 Takviyeli Ni-B Nanokompozit Kaplama Üretimi ve Karakterizasyonu

Ni-B ve Ni-B-CeO2 nanokompozit kaplamalar nikel sülfat hekzahidrat, dimetilamin boran, sodyum asetatve tiyoüre içeren kaplama banyosu kullanılarak akımsız kaplama işlemi ile üretilmiştir. Nanokompozitüretiminde kullanılan CeO2 nanopartikül takviyelerinin boyutu 100-500 nm aralığındadır. Takviyepartiküllerinin banyo içerisinde kolay dağılımını ve ıslanabilirliğini artırmak için sodyum dodesil sülfatkullanılmıştır. Takviye partikül miktarı 15 gr/lt olarak seçilmiştir. Saf Ni-B ve nanokompozit Ni-B-CeO2akımsız kaplamalar için banyo pH değeri 6, kaplama süresi 60 dakika ve banyo sıcaklığı 70 °C ± 5 °C olarakbelirlenmiştir. Takviye CeO2 nanopartiküllerinin kaplamanın morfolojisi ve sertliği üzerindeki etkileriincelenmiştir. Yapılan karakterizasyon işlemleri sonucunda nanoboyutlu CeO2 partiküllerinin Ni-Balaşımına başarılı bir şekilde ilave edildiği ve nanokompozit kaplama üretiminin gerçekleştirildiğibelirlenmiştir. Bununla birlikte takviye malzemenin etkisinin karşılaştırmalı olarak incelenmesi amacıylaaynı banyo bileşimi kullanılarak takviyesiz saf Ni-B kaplama da üretilmiştir. CeO2 nanopartiküllerinin NiB matrisine ilave edilmesiyle hesaplanan Ni kristal boyutu 43 nm'den 24,9 nm'ye düşmüştür. Ayrıca safNi-B alaşımı ile kıyaslandığında CeO2 takviyeli Ni-B nanokompozit kaplamanın sertlik değerinde de artışmeydana geldiği belirlenmiştir

Ni-B ve Ni-B-CeO2 nanokompozit kaplamalar nikel sülfat hekzahidrat, dimetilamin boran, sodyum asetat ve tiyoüre içeren kaplama banyosu kullanılarak akımsız kaplama işlemi ile üretilmiştir. Nanokompozit üretiminde kullanılan CeO2 nanopartikül takviyel

Ni-B and Ni-B-CeO2 nanocomposite coatings were produced by electroless coating process using a coating bath containing nickel sulphate hexahydrate, dimethylamine borane, sodium acetate and thiourea. The size of the CeO2 nanoparticle reinforcements used in nanocomposite production is in the range of 100-500 nm. Sodium dodecyl sulfate was used to increase the easy dispersion and wettability of the reinforcement particles in the bath. The amount of reinforcement particles is determined as 15 g/lt. For pure Ni-B and nanocomposite Ni-B-CeO2 electroless coatings, bath pH value was 6, coating time was 60 minutes and bath temperature was 70 °C ± 5 °C. The effects of CeO2 particles used as reinforcement on the morphology and hardness of coating were investigated. Nano-sized CeO2 particles were successfully incorporated into the Ni-B alloy and nanocomposite coating was produced. Also, NiB coating without reinforcement was produced using the same bath composition in order to compare the effect of the reinforcement material. Due to the incorporation of CeO2 nanoparticles in the Ni-B matrix, the calculated Ni crystal size decreased from 43 nm to 24.91 nm. In addition, it was determined that the hardness of the CeO2 reinforced Ni-B nanocomposite coating increased when compared to the pure Ni-B alloy.

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