Effect of Heat Treatment and Applied Load on Mechanical and Tribological Properties of Ni-B-CeO2 Composite Electroless Coating

Abstract

Cerium oxide (CeO2) particle reinforced Ni-B composite coating was produced by electroless coating method from a Ni-B coating bath containing CeO2 particles. In the electroless plating bath, nickel sulfate hexahydrate ((NiSO4.6H2O) was used as nickel source, dimethylamine borane ((CH3)2NHBH3) as reducing agent, thiourea (CH4N2S) as stabilizer and sodium acetate (CH3COONa) as complexing agent. The aim of the study is to investigate the structural characterization of CeO2 particle reinforced coating and the effects of wear test conditions on its tribological properties. The surface morphology of the coating was performed by scanning electron microscope (SEM), and phase structure analysis was performed by X-ray diffraction (XRD). Nanohardness measurements were carried out with a nanoindenter device, and wear tests were done with a ball-on-disk test device. Worn surface analyzes were made using a 3D profilometer. Experimental results showed that the hardness of the coating increased with heat treatment; however, its tribological behavior changed depending on different loads

Keywords

• Electroless coating
• Ni-B coating
• Composite
• Wear
• Tribology.

Ni-B-CeO2 Kompozit Akımsız Kaplamanın Mekanik ve Tribolojik Özelliklerine Isıl İşlem ve Yükün Etkisi

Öz

Seryum oksit (CeO2) partikül takviyeli Ni-B kompozit kaplama CeO2 partikülleri içeren bir Ni-B kaplama banyosundan akımsız kaplama yöntemi ile üretilmiştir. Akımsız kaplama banyosunda nikel kaynağı olarak nikel sülfat hekzahidrat ((NiSO4.6H2O), indirgeyici ajan olarak dimetilamin boran ((CH3)2NHBH3), stabilizatör olarak tiyoüre (CH4N2S) ve kompleks oluşturucu olarak da sodyum asetat (CH3COONa) kullanılmıştır. Çalışmanın temel amacı, CeO2 partikül takviyeli kaplamanın yapısal karakterizasyonu ve aşınma deney şartlarının tribolojik özellikleri üzerindeki etkilerini araştırmaktır. Kaplamanın yüzey morfolojisi taramalı elektron mikroskobu (SEM) cihazı, faz yapısı analizi ise X-ışını kırınımı (XRD) cihazı ile yapılmıştır. Nanosertlik ölçümleri nanoindenter cihazı ve aşınma testleri disk üzerinde bilye test cihazı ile gerçekleştirilmiştir. 3D profilometre kullanılarak aşınmış yüzey analizleri yapılmıştır. Deneysel sonuçlar, kaplamanın sertliğinin ısıl işlem ile arttığını, bununla birlikte farklı yüklere bağlı olarak tribolojik davranışının değişim gösterdiği anlaşılmıştır.

Anahtar Kelimeler

• Akımsız kaplama
• Ni-B kaplama
• Kompozit
• Aşınma
• Triboloji.

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