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Evaluation of Durability of SOG-layers on Steel Surfaces by Wear and Scratch Tests
Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.ORCID iD: 0000-0003-3149-4296
InMold Biosystems, Farum & Høje-Taastrup, Denmark.
Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.ORCID iD: 0000-0002-9084-819X
Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.ORCID iD: 0000-0001-8058-1252
2014 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Steel moulds with high precision surfaces are being used in various branches. Process aspects, like tool life and tribological properties, as well as design issues are of great importance. This work summarises experimental studies performed to test durability properties of SOG (spin-on-glass)-layers on steel surfaces. This coating technique is based on a newly developed method for surface preparation of tools which has been demonstrated to be durable for more than 66.000 replications in injection moulding processes without loss of surface fidelity. The procedure allows surface roughness reduction from approximately 200 nm Ra down to some few nm for high gloss applications, as well as easy transfer of large-area functional nanostructures on complex 3D surfaces.

Three different types of surfaces were investigated: SOG-layered metal surfaces with three different layer thicknesses, one ingot casted and one electro slag remelted material (with hardness level of 950 and 2500 MPa, respectively). The metal surfaces were ground and polished to mirrorlike finishes.

Three circular samples of each type were rubbed against a hard steel ball of 6.35 mm radius on a commercial pin-on-disk tribometer. To resemble the molding process a sliding speed of 2 mm/s and a load of 8 N were chosen. The tests were performed with 5 minutes intervals until the first damage on the surface were observed. In parallel, scratch tests were performed in the same tribometer. The surfaces were measured in-situ by a portable microscope and a stylus, and afterwards by a white light interferometer and scanning electron microscope to evaluate the size of the wear/scratch traces.

The surface type with the longest time to damage and/or smallest wear/scratch traces was considered to be the most durable one.

Place, publisher, year, edition, pages
2014.
Keyword [en]
mirror finish, tribometer, ball-on-disk, scratch-test, SOG-layers
National Category
Mechanical Engineering Tribology
Identifiers
URN: urn:nbn:se:hh:diva-25136OAI: oai:DiVA.org:hh-25136DiVA: diva2:713454
Conference
The 16th Nordic Symposium on Tribology - NORDTRIB 2014, Aarhus, Denmark, 10-13 June, 2014
Available from: 2014-04-23 Created: 2014-04-23 Last updated: 2015-04-17Bibliographically approved

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Dimkovski, ZlateRebeggiani, SabinaRosén, Bengt-Göran
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