Effect of PTFE Concentration on Microhardness and Wear Behavior in Ni-P-W-PTFE Composite Coatings by Electroless Deposition

Abstract

In this study, polytetrafluoroethylene (PTFE) reinforced Ni-P-W composite coatings were produced by electroless method in an alkaline bath. For the composite coatings, the PTFE concentration was chosen as 5, 10 and 20 g/L, respectively. The surface microstructure of the produced coatings was made by Scanning Electron Microscope (SEM) and chemical analysis was done by X-Ray Diffraction (XRD) method. The mean microhardness values of the composite coatings produced with different PTFE concentrations were measured as 513±22 HV, 494±17 HV and 392±25 HV, respectively. The lowest coefficient of friction in wear at room temperature was found to be 0.232 µ in the coating with a PTFE concentration of 10 g/L. By increasing the concentration by 20 g/L, the average friction coefficient increased by approximately 60% to 0.375 µ.

Keywords

• Electroless Coating
• PTFE
• Tungsten
• Wear
• Hardness

Akımsız Ni-P-W Kompozit Kaplamalarda PTFE Konsantrasyonunun Sertlik ve Aşınma Üzerinde Etkisi

Öz

Bu çalışmada politetrafloroetilen (PTFE) takviyeli Ni-P-W kompozit kaplamalar alkalin bir banyoda akımsız yöntemle üretilmiştir. Kompozit kaplamalar için PTFE konsantrasyonu sırası ile 5, 10 ve 20 g/L seçilmiştir. Üretilen kaplamaların yüzey mikroyapısı Taramalı Elektron Mikroskobu (SEM) ile kimyasal analizi ise X-Işınları Kırınımı (XRD) yöntemiyle yapılmıştır. Farklı PTFE konsantrasyonları ile üretilen kompozit kaplamaların ortalama mikro sertlik değerleri sırasıyla 513±22 HV, 494±17 HV ve 392±25 HV olarak ölçülmüştür. Oda sıcaklığında kuru ortamda yapılan aşınmalarda en düşük sürtünme katsayısı 0.232 µ ile PTFE konsantrasyonun 10 g/L olduğu kaplamada görülmüştür. Konsantrasyonun 20 g/L çıkarılmasıyla ortalama sürtünme katsayısında yaklaşık % 60 oranında bir artışla 0.375 µ olmuştur.

Anahtar Kelimeler

• Akımsız Kaplama
• PTFE
• Tungsten
• Aşınma
• Sertlik

Kaynakça

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