Since the bonding strength of Babbit alloys to their steel support cannot be measured with Chalmers specimens according to DIN ISO 4386, part 2, if the layer is too thin, an alternative specimen constellation was developed which enables the measurement of the bonding strength of layers as thin as 0.5 mm. The new specimen geometry consists of two coaxially aligned steel cylinders of equal diameter which leave a gap between opposite faces. After pretreatment in a metallic immersion bath of tin or an alloy of tin with 50 wt.-% zinc, the Babbit alloy is poured into the gap. Then the bonded steel cylinders are tensile tested. The force at fracture is divided by the cylinder cross-section yielding the bonding strength. This configuration is termed the face tensile specimen and was successfully tested on three different Babbit alloys. Up to a layer thickness of 1.5 mm the face tensile specimen delivers bonding strength quite comparable to those achieved with Chalmers specimens. Face tensile specimens require less Babbit alloy and are less costly to manufacture.
About the authors
Dr.-Ing. Kenan Sürül used to be a Member of the Scientific Staff of the Institute for Materials Applications in Mechanical Engineering of RWTH Aachen University and wrote his Doctoral thesis on the bonding strength of various Babbit alloys on steel supports.
Prof. Dr.-Ing. Paul Beiss is the former Head of the Institute for Materials Applications in Mechanical Engineering of RWTH Aachen University. He retired in 2010.
Dr.-Ing. Okan Akin, retired, worked at the same institute and was Responsible for the Research Group on Babbit materials.
1 DIN ISO 4386: Plain Bearings – Metallic Multilayer Plain Bearings – Part 2: Destructive Testing of Bond for Bearing Metal Layer Thicknesses Greater than or Equal to 2 mm, Beuth, Berlin, Germany (2019)Search in Google Scholar
2 D. Nesic: Entwicklung und Charakterisierung hochfester umweltfreundlicher Gleitlagerlegierungen auf Sn – Basis, Dr.-Ing. Thesis, RWTH Aachen, Aachen, Germany (2013)Search in Google Scholar
3 K. Sürül: Development of Novel Bonding Layers for Improvement of the Bonding Strength of Sn-Based Alloys for Sliding Bearings, Dr.-Ing. Thesis, RWTH Aachen, Aachen, Germany (2009) (in German)Search in Google Scholar
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