Otomotiv Endüstrisinde Kullanılan PTFE Esaslı Radyal Kaymalı Yataklarda Karbon ve Cam Elyaf Katkı Maddelerinin Sürtünme, Sıcaklık, Titreşim ve Gürültüye Etkisi

Öz

Otomotiv şirketleri daha düşük maliyetlerle parça üretmek için çeşitli çalışmalar yürütmektedir. Özellikle metal esaslı yapılardan kompozit malzemelere doğru bir eğilim görülmektedir. Kompozit malzemeler düşük üretim maliyetleri, kolay işlenebilirlikleri ve korozyon dirençleri nedeniyle tercih edilmektedir. Ayrıca hammadde temininde yaşanan sıkıntıları azaltmada da etkili rol oynamaktadırlar. Ancak bu malzemelerin özelliklerinin iyileştirilmesi gerekmektedir. Kompozit malzemelerin mekanik özellikleri farklı katkı maddeleri kullanılarak iyileştirilebilir. Bu bağlamda PTFE (politetrafloroetilen) malzemelere eklenen katkı maddeleri ile mekanik performansın artırılabileceği görülmektedir. En yaygın katkı maddeleri arasında PTFE'nin mekanik ve fiziksel özelliklerini iyileştiren karbon ve cam elyafı yer almaktadır. Bu çalışmada üç farklı yatak malzemesi (saf PTFE, %25 karbon katkılı PTFE ve %25 cam elyaf katkılı PTFE) kullanılarak üretilen radyal kaymalı yataklar test edilmiştir. Deneylerde katkı maddelerinin sürtünme katsayısı, yatak sıcaklığı, mekanik titreşim ve gürültüye olan etkileri incelenmiştir. Deneyler üç farklı yükte (12, 24 ve 36 N) ve üç farklı hızda (0,50, 0,75 ve 1,00 m/s) gerçekleştirilmiştir. Deneysel sonuçların genel bir değerlendirmesi, karbon katkı maddesinin yüksek hız ve yüklerde saf PTFE'ye kıyasla sürtünme katsayısını %22,83 oranında azalttığını, mekanik titreşimi %0,75 oranında artırdığını ve gürültü seviyelerini 0,2 dBA oranında artırdığını göstermektedir.

Anahtar Kelimeler

• PTFE
• Karbon
• Cam Elyaf
• Kaymalı Yatak
• Mekanik Titreşim
• Gürültü

Teşekkür

Yazarlar Tokat Gaziosmanpaşa Üniversitesi'ne teşekkürlerini iletmektedirler.

Effect of carbon and glass fiber additives on friction, temperature, vibration and noise in PTFE based radial journal bearings used in the automotive industry

Öz

Automotive companies are carrying out various studies to produce parts at lower costs. In particular, a trend from metal-based structures to composite materials is observed. Composite materials are preferred due to their low production costs, easy processing, and corrosion resistance. They also play an effective role in reducing difficulties in raw material supply. However, these materials' properties require improvement. The mechanical properties of composite materials can be improved by using different additives. In this context, it is observed that mechanical performance can be increased with additives added to PTFE (polytetrafluoroethylene) materials. The most common additives include carbon and glass fiber, which improve the mechanical and physical properties of PTFE. In this study, radial sliding bearings produced using three different bearing materials (pure PTFE, 25% carbon-doped PTFE, and 25% glass fiber-doped PTFE) were tested. In the experiments, the effects of additives on friction coefficient, bearing temperature, mechanical vibration, and noise were investigated. The experiments were carried out at three different loads (12, 24, and 36 N) and three different speeds (0.50, 0.75, and 1.00 m/s). A general evaluation of the experimental results indicates that the addition of carbon reduces the coefficient of friction by 22.83%, while it increases mechanical vibration by 0.75% and noise levels by 0.2 dBA compared to pure PTFE under high-speed and high-load conditions. These findings suggest that the carbon additive enhances the tribological efficiency of PTFE by reducing friction, albeit with a slight trade-off in dynamic stability and acoustic performance.

Anahtar Kelimeler

• PTFE
• Carbon
• Glass Fiber
• Journal Bearing
• Mechanical Vibration
• Noise

Teşekkür

The writers convey their appreciation to Tokat Gaziosmanpaşa University.

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