Accessible Unlicensed Requires Authentication Published by De Gruyter April 14, 2015

Tribological properties of boronized ferrous based PM journal bearings

Tribologische Eigenschaften von borierten eisenbasierten PM-Gleitlagern
Bekir Sadık Ünlü, Selim Sarper Yilmaz, Naci Kurgan and Remzi Varol
From the journal Materials Testing

Abstract

Ferrous based PM (powder metallurgical) materials are widely used in journal bearings since they provide a good tribological performance. These bearings are self-lubricating and can be used in places where lubricating is not possible. This also applies to the shaft material which shows adhesive wear. Tribological properties can be improved and adhesive wear can be decreased by boronizing. In this study, tribological properties of ferrous based boronized and non-boronized Fe-graphite, FeCu-graphite and CuSnFe-graphite bearings manufactured by PM method have been determined and compared. Boronizing treatment was carried out at 950° C for 4 hours. The SAE 1050 steel shaft was used as counter abrader. Experiments were carried out at 20 N loads and 1500 rpm every 30 minutes for 2.5 hours.

Kurzfassung

Eisenbasierte pulvermetallurgische PM-Werkstoffe werden breitflächig für Gleitlager verwendet, da sie gute tribologische Eigenschaften aufweisen. Solche Gleitlager sind selbstschmierend und können an Stellen, wo eine Schmierung nicht möglich ist, verwendet werden. Dies betrifft auch das Schaftmaterial, wo sich Adhäsivverschleiß zeigt. Die tribologischen Eigenschaften werden verbessert und der Adhäsivverschleiß mittels Borieren vermindert. In der diesem Beitrag zugrundeliegenden Studie wurden die tribologischen Eigenschaften von borierten und nicht borierten Gleitlagern aus Eisengraphit, Eeisenkupfergraphit und Eisen-Zinn-Kupfergraphit, die mittels Pulvermetallurgie (PM) hergestellt wurden, untersucht und miteinander verglichen. Die Borierbehandlung wurde bei 950 °C über 4 h ausgeführt. Der Schaft aus dem Stahl SAE 1050 wurde als Gegenabrieb verwendet. Die Experimente wurden jeweils bei einer Kraft von 20 N und Umdrehungszahlen von 1500 U·min−1 und 2,5 h lang alle 30 Minuten ausgeführt.


§Correspondence Address, Assoc. Prof. Dr. Bekir Sadık Ünlü, Department of Manufacturing Engineering, Technology Faculty, Celal Bayar University, 45400, Turgutlu Manisa, , , ,

Dr. Bekir Sadık Ünlü, born in 1968, received his BSc in 1993, his MSc in 1996 and his PhD in Mechanical Engineering in 2004. He has been Assoc. Professor at Celal Bayar University, Manisa, Turkey, since 2013.

Dr. Selim Sarper Yılmaz, born in 1971, received his BSc in Technical Education in 1994, his MSc in 1997 and his PhD in Mechanical Engineering in 2004. He has been Assoc. Professor at Celal Bayar University, Manisa, Turkey, since 2014.

Dr. Naci Kurgan, born in 1972, received his BSc in 1994, his MSc in 1997 and his PhD in Mechanical Engineering in 2005. He has been Assoc. Professor at Karabük University, Turkey, since 2014.

Dr. Remzi Varol, born in 1960, received his BSc in Technical Education in 1982, his MSc in 1984 and his PhD in Mechanical Engineering in 1991. He has been Professor at Süleyman Demirel University, Isparta, Turkey, since 2006.


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Published Online: 2015-04-14
Published in Print: 2015-03-02

© 2015, Carl Hanser Verlag, München