High temperature tribology

© Photo Fraunhofer IWM

We make friction and wear of materials and components calculable: with our experiments we examine the tribological effects of materials and their surfaces.

High operating temperatures are ubiquitous: they can be found in drive units, in industrial production processes like hot forming and machining and in energy production. The challenge comes in cases in which high temperature liquid lubrication is not possible, yet components are still expected to function reliably and for an extended period of time.

High temperatures often inhibit the efficiency of systems under high frictional stress. Moreover, high temperatures are not only generated by the environment, but also by friction heat.

Different material classes – polymers, metals, ceramics and coatings – react very differently to increased operational or friction temperatures: While polymers and some coatings mostly dissolve thermally, other materials react chemically with the atmosphere or are plastically deformed within tribological contacts.

It is a special challenge to construct experimental tests in which thermal effects – including interaction with the atmosphere – can be simulated in an application-related manner. Only then can truly relevant statements about the tribological behavior of systems in increased temperatures be generated.

At the Fraunhofer Institute for Mechanics of Materials IWM, It is our job to investigate the tribology of materials and components at high temperatures in order to contribute to the description and improvement of a given system’s efficiency, reliability and life span.

© Photo Fraunhofer IWM

Friction tests at high temperature, for example for combustion engines or forming processes

Topics and projects at the Fraunhofer IWM concerning high temperature tribology

Friction and wear behavior of plain bearings at high operating temperatures

Tribology of combustion engines, especially their valves/valve seats or pistons/cylinders

Development and qualification of coatings for high operating temperatures

Development of ceramic tools for the hot pressing of magnets

Tribology of hot forming processes, for example barrels, drums and extrusion molding

Tribological qualification of ceramic or coated cutting tools

Further development of tribological testing technology at high temperatures and in defined atmospheres

Numerical simulation of thermomechanical stress in friction contacts

Wear simulation at high temperatures

© Photo Fraunhofer IWM

Example trial: tube welding line

© Photo Fraunhofer IWM

Basic high temperature test setup of an oscillation abrasion test stand (Schwingungs-Reibverschleiß-Prüfstand or SRV)

© Photo Fraunhofer IWM

Test arrangement with active heating

Publikationen 

Khader, I.; Renz, A.; Kailer, A.; A wear model for silicon nitride in dry sliding contact against a nickel-base alloy; Wear 376-377/Part A (2017) 352-362 Link

Renz, A.; Kürten, D.; Lehmann, O.; Wear of hardfaced valve spindles in highly loaded stationary lean-burn large bore gas engines; Wear 376-377/Part B (2017) 1652-1661 Link

Renz, A.; Khader, I.; Kailer, A.; Tribochemical wear of cutting-tool ceramics in sliding contact against a nickel-base alloy; Journal of the European Ceramic Society 36/3 (2016) 705-717 Link

Rapoport, L.; Moshkovich, A.; Perfilyev, V.; Lapsker, I.; Kugler, M.; Kailer, A.; Renz, A.; Hollstein, T.; High temperature friction behavior of CrVxN coatings; Surface and Coatings Technology 238 (2014) 207-215 Link

Khader, I.; Renz, A.; Kailer, A.; Haas, D.; Thermal and corrosion properties of silicon nitride for copper die casting components; Journal of the European Ceramic Society 33/3 (2013) 593-602 Link

Khader, I.; Hashibon, A.; Albina, J.-M.; Kailer, A.; Wear and corrosion of silicon nitride rolling tools in copper rolling; Wear 271/9-11 (2011) 2531-2541 Link

Khader, I.; Kailer, A.; Damage mechanisms in silicon nitride wire-rolling tools: Lab-scale experiments and correlation with finite element modeling; Journal of Materials Processing Technology 210/10 (2010) 1314-1325 Link

Kailer, A.; Mauk, P.-J.; Eckardt, C.; Berroth, K.; Kozlowski, J.; Wagemann, A.; Ceramic rolling tools for enhanced lifetime and product quality; Steel Research International 79/Special Edition; Pietrzyk, M. (Ed.) Verlag Stahleisen, Düsseldorf (2008) 401-406 Link

Kailer, A.; Hollstein, T.; Walzen mit Keramik; in Tagungsband zum Fachsymposium "Keramik für Walzwerkstechnik"; Fraunhofer-IRB-Verlag, Stuttgart (2004) 128 Seiten Link

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