Kesikli Akım Elektrobiriktirme Yöntemiyle Üretilen Ni/W-Si3N4 Kompozitlerinin Mikroyapı ve Aşınma Özelliklerine Si3N4 Konsantrasyonunun Etkisi

Öz

Bu çalışmada, Ni/W-Si3N4 kompozitleri kesikli akım elektrobiriktirme (KEB) yöntemiyle üretilmiştir. Ni/W alaşımlarının saf nikelden çok daha iyi mekanik özelliklere sahip olmasından dolayı Ni/W alaşım matrisli Si3N4 partikül takviyeli kompozitler KEB tekniği ile geliştirilmiştir. Banyo çözeltisi içerisindeki dört farklı silisyum nitrür (Si3N4) konsantrasyonunun üretilen kompozitlerin mikroyapısı, mikrosertliği ve aşınma özellikleri üzerindeki etkileri incelenmiştir. KEB tekniği ile üretilen Ni/W- Si3N4 kompozitlerin karakterizasyonu taramalı elektron mikroskobu (SEM), X-ışını kırınımı (XRD), mikrosertlik test cihazı ve sürtünme aşınma testi ile gerçekleştirilmiştir. Kesikli akım elektrobiriktirme (KEB) yöntemiyle üretilen dört farklı kompozit kaplama arasından 15 g/L partikül konsantrasyonu ile üretilen Ni/W- Si3N4 kompoziti en uygun partikül konsantrasyonu olarak tespit edilmiş olup, elde edilen kompozit kaplama ile yaklaşık 800 HV’lik sertlik değerlerine ulaşılmıştır. Ayrıca XRD analizinden scherrer formülü ile alaşım matrisin ortalama krsitalin boyutları hesaplanmış ve alaşımın ortalama kristalin tane boyutunun yaklaşık yarı yarıya azaldığı ve 12.14 nm seviyelerine kadar düştüğü tespit edilmiştir. Benzer şekilde yapılan kompozitlerin aşınma performanslarını ortaya koymak için yapılan aşınma testleri sonucunda da sürtünme katsayısının optimum partikül miktarı içeren Ni/W-Si3N4 kompozit kaplamalarda 0,45 m değerlerine kadar düştüğü ve aynı kompozit için aşınma hızının ise yaklaşık 1/3 oranında azaldığı tespit edilmiştir.

Anahtar Kelimeler

• Si3N4
• tungsten
• kesikli akım
• sertlik
• aşınma.

Effect of Si3N4 Concentration on Microstructure and Wear Properties of Ni/W- Si3N4 Composites Produced by Pulse Current Electrodeposition Technique

Abstract

In this study, Ni/W-Si3N4 composites were produced by pulse current electrodeposition (PED) method. Since Ni/W alloys have much better mechanical properties than pure nickel, Si3N4 particle reinforced composites with Ni/W alloy matrix were developed with PED technique. The effects of four different silicon nitride (Si3N4) concentrations in the bath solution on the microstructure, microhardness and wear properties of the produced composites were investigated. The characterization of Ni/W-Si3N4 composites produced by PED technique was carried out by scanning electron microscope (SEM), X-ray diffraction (XRD), microhardness tester and friction wear test. Ni/W-Si3N4 composite produced with a particle concentration of 15 g/L among four different composite coatings produced by the pulsed current electrodeposition (PED) method was determined as the most suitable particle concentration, and hardness values of approximately 800 HV were reached with the obtained composite coating. In addition, the average crystalline size of the alloy matrix were calculated with the Scherrer formula from the XRD analysis, and it was determined that the average crystalline grain size of the alloy decreased by about half and decreased to the level of 12.14 nm. Similarly, as a result of the wear tests carried out to reveal the wear performance of the composites, it was determined that the friction coefficient decreased to 0.45  in the Ni/W-Si3N4 composite coatings containing the optimum particle amount, and the wear rate for the same composite decreased by about 1/3.

Keywords

• Si3N4
• tungsten
• pulse current
• hardness
• wear.

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