Berilyum bakır alaşımında akımsız Ni-P ve Ni-B kaplamaların aşınma performansı

Yıl 2022, Cilt: 11 Sayı: 2, 416 - 422, 15.04.2022

Ferda Mindivan , Harun Mindivan

https://doi.org/10.28948/ngumuh.1024914

Öz

Berilyum bakır (Be-Cu) alaşımları yüksek sıcaklık iletkenliği ve nispeten yüksek mukavemetleri ile hızlı kalıp üretimi için uygun malzemelerdir. Ancak, düşük aşınma ve oksidayon direnci özellikleri nedeniyle kullanımları sınırlı kalmıştır. Bu çalışmada Be-Cu alaşımı üzerine akımsız Nikel-Fosfor (Ni-P) ve Nikel-Bor (Ni-B) kaplamalar hazırlanmış ve aşınma özellikleri kaplanmamış alaşım ile karşılaştırılmıştır. Kaplamaların mikroyapı görüntüleri Ni-P kaplamanın yaklaşık 12 µm kalınlığında, düz bir yüzey sergilediği göstermiştir. Ni-B kaplamanın ise yaklaşık 7-8 µm ortalama kalınlıkta, pürüzlü ve dalgalı bir yüzey görüntüsüne sahip olduğu belirlenmiştir. XRD analiz sonuçları ile akımsız kaplamaların amorf ve kristalin bölgelerin karışımından ibaret olduğu ve Ni-B kaplamanın Ni-P kaplamaya kıyasla daha amorf yapı sergilediği tespit edilmiştir. Akımsız Ni-P ve Ni-B kaplamaların sertlik değerleri kaplanmamış alaşıma nazaran sırasıyla 2.2 ve 3.7 kat artmıştır. Akımsız Ni-B kaplamanın sertliğindeki artışa bağlı olarak, her iki yük altında (5 and 7.5 N) aşınma kaybında % 77 oranında azalma olduğu belirlenmiştir.

Anahtar Kelimeler

Berilyum bakır alaşımı, Akımsız Ni-P kaplama, Akımsız Ni-B kaplama, Kuru aşınma

Destekleyen Kurum

Bu çalışma Bilecik Şeyh Edebali Üniversitesi Bilimsel Araştırma Projeleri Birimi

Proje Numarası

2021-01.BŞEÜ.01-02

Teşekkür

Bu çalışma Bilecik Şeyh Edebali Üniversitesi Bilimsel Araştırma Projeleri Birimi tarafından 2021-01.BŞEÜ.01-02 nolu proje kapsamında desteklenmiştir.

Wear performance of electroless Ni-P and Ni-B coatings on beryllium copper alloy

Öz

Beryllium copper (Be-Cu) alloys are suitable materials for mold production speedy (rapid mold production) with their high temperature conductivity and relatively high strength. However, their use has been limited due to their low wear and oxidation resistance properties. In this study, electroless Nickel-Phosphorus (Ni-P) and Nickel-Boron (Ni-B) coatings were prepared on the Be-Cu alloy and the wear properties were compared with the uncoated alloy. Microstructure images of the coatings showed that the Ni-P coating exhibited a flat surface with a thickness of about 12 µm. Ni-B coating had a rough and wavy surface with an average thickness of approximately 7-8 µm. It was determined that the electroless coatings consisted of a mixture of amorphous and crystalline regions with the XRD analysis results and the Ni-B coating exhibited more amorphous structure compared to the Ni-P coating. The hardness values of electroless Ni-P and Ni-B coatings increased by 2.2 and 3.7 times, respectively, compared to the uncoated alloy. Depending on the increase in the hardness of the electroless Ni-B coating, it was determined that there was a 77% reduction in wear loss under both loads (5 and 7.5 N).

Anahtar Kelimeler

Beryllium copper alloy, Electroless Ni-P coating, Electroless Ni-B coating, Dry wear

Proje Numarası

2021-01.BŞEÜ.01-02

Kaynakça

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