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

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

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

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).

Keywords:

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

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Z.W. Zhong, M.H. Leong, X.D. Liu, The wear rates and performance of three mold insert materials, Materials and Design, 32, 643–648, 2011. https://doi.org/ 10.1016/j.matdes.2010.08.008.
J.C. Avelar-Batista Wilson, S. Banfield, J. Eichler, A. Leyland, A. Matthews, J. Housden, An investigation into the tribological performance of Physical Vapour Deposition (PVD) coatings on high thermal conductivity Cu-alloy substrates and the effect of an intermediate electroless Ni–P layer prior to PVD treatment, Thin Solid Films, 520, 2922-2931, 2012. https://doi.org/10.1016/j.tsf.2011.11.034.
B. Podgornik, O. Massler, F. Kafexhiu, M. Sedlacek, Crack density and tribological performance of hard-chrome coatings, Tribol. Int., 121, 333-340, 2018. https://doi.org/10.1016/j.triboint.2018.01.055.
H. Mindivan, Corrosion and tribocorrosion behaviour of WC/C coating on beryllium-copper mould alloy, Mater. Today: Proc., 27 (4), 3114-3118, 2020. https://doi.org/10.1016/j.matpr.2020.03.726.
H. Ogihara, T. Katayama, T. Saji, Electroless deposited robust Ni–B films coated with trimethylsiloxysilicate exhibit superhydrophobicity, J. Mater. Chem., 21, 14890–14896, 2011. https://doi.org/10.1039/ C1JM12303C
F. Mindivan, AISI 316L paslanmaz çeliğin yüzey özelliklerine akımsız Ni-B, Ni-P/Ni-B ve Ni-B/Ni-P kaplamaların etkisi. Yüksek Lisans Tezi, Bursa Uludağ Üniversitesi Fen Bilimleri Enstitüsü, Türkiye, 2021.
H. Mindivan, Tribocorrosion behavior of electroless Ni-P/Ni-B duplex coating on AA7075 aluminum alloy, Ind. Lubr. Tribol., 71(2), 630-635, 2019. https://doi.org/10.1108/ILT-05-2018-0177
F. Mindivan, H. Mindivan, C. Darcan, Electroless Ni-B coating of pure titanium surface for enhanced tribocorrosion performance in artificial saliva and antibacterial activity. Tribol. Ind., 39(2), 270-276, 2017.https://doi.org/10.24874/ti.2017.39.02.15
J. Zhang, Z.-H. Xie, H. Chen, C. Hu, L. Li, B. Hu, Z. Song, D. Yan, G. Yu, Electroless deposition and characterization of a double-layered Ni-B/Ni-P coating on AZ91D Mg alloy from eco-friendly fluoride-free baths, Surf. Coat. Technol., 342, 178-189. 2018. https://doi.org/10.1016/j.surfcoat.2018.02.105.
U. Matik, Effect of crystallization on wear and corrosion behavior of electroless Ni-P/Ni-B duplex coating on ferrous PM compacts, Kov. Mater., 58, 247-254, 2020. https://doi.org/10.4149/km_2020_4_247
R.C. Agarwala, V. Agarwala, Electroless alloy/composite coatings: A review, Sadhana, 28, 475–493, 2003. https://link.springer.com/article/10.1007/ BF02706445.
H. Zhang, Y. Jiang, J. Xie, Y. Li, L. Yue, Precipitation behavior, microstructure and properties of aged Cu-1.7 wt% Be alloy, J. Alloys Compd., 773, 1121-1130, 2019. https://doi.org/10.1016/j.jallcom.2018.09.296.
I. Baskaran, R.S. Kumar, T.S.N. Sankara Narayanan, A. Stephen, Formation of electroless Ni–B coatings using low temperature bath and evaluation of their characteristic properties, Surf. Coat. Technol., 200,6888–6894, 2006. https://doi.org/10.1016/ j.surfcoat.2005.10.013.
M. Czagány, P. Baumli, G. Kaptay, The influence of the phosphorous content and heat treatment on the nano-micro-structure, thickness and micro-hardness of electroless Ni-P coatings on steel, Appl. Surf. Sci., 423:160–169, 2017. https://doi.org/10.1016/ j.apsusc.2017.06.168.
K. Krishnaveni, T.S.N. Narayanan Sankara, S.K. Seshadri, Electroless Ni-B coatings: preparation and evaluation of hardness and wear resistance, Surf. Coat. Technol., 190, 115-121. 2005. https://doi.org/ 10.1016/j.surfcoat.2004.01.038.
F. Madah, C. Dehghanian, A.A. Amadeh, (). Investigations on the wear mechanisms of electroless Ni–B coating during dry sliding and endurance life of the worn Surfaces, Surf. Coat. Technol., 282:6–15, 2015. https://doi.org/10.1016/j.surfcoat.2015.09.003.
F. Mindivan, H. Mindivan, The study of electroless Ni-P/Ni-B duplex coating on HVOF-sprayed martensitic stainless steel coating, Acta Phys. Pol., 131 (1), 64-67, 2017.https://doi.org/10.12693/APhysPolA.131.64
H. Mindivan, Tribocorrosion behavior of electroless Ni-P/Ni-B duplex coating on AA7075 aluminum alloy, Ind. Lubr. Tribol., 71 (5), 630-635, 2019. https://doi.org/10.1108/ILT-05-2018-0177.