Symposium 2025
Tribology in Industry and Research
Interlocked Behavior – Where Tribology Meets Rheology
Seminar
Wednesday, 19 November 2025
Conference
Thursday, 20 November 2025
Motivation and Thematic Focus
Rheology studies the flow and deformation behavior of materials, while tribology deals with friction, wear and lubrication. Both disciplines overlap in numerous technical and biological applications in which two surfaces are in relative motion to each other through an intermediate medium – such as a lubricant – as in machines or human joints. In such lubricated tribosystems, the rheological behavior of the lubricant is decisive for the lubrication regime and therefore has a significant influence on friction and wear. Since shear, temperature and pressure are subjected to changes during operation, the rheological properties also change dynamically – with direct effects on tribological behavior. A deep understanding of these relationships is the key to targeted adaptations, whether in the development of new lubricants, in medical technology or in process-specific applications in the food sector. Rheological knowledge thus provides an essential basis for resource-saving, high-performance and durable solutions.
The ÖTG Symposium 2025 will focus on rheological and tribological strategies for modern production processes and product developments. The application of practical experience and current research outcomes opens up new potential for increasing efficiency, improving quality and designing sustainable tribological systems.
As part of the two-day program, you will have the opportunity to learn more about the importance of rheology in tribology from
Prof. Robert Liska (TU Wien) and Prof. Helen Wilson (University College London).
Expert presentations will inform you about the latest findings from both disciplines, and you will also have the opportunity to get to know the Anton Paar GmbH product portfolio directly on site.
Programme
Interviews
Die Tribologie – Ein Auslaufmodell oder ein Zukunftstreiber?
Patrick Beau, Optimol Instruments Prüftechnik GmbH
Forschungsfragen in der e-Mobilität
Katharina VÖLKEL, Lehrstuhl für Maschinenelemente (Prof. Stahl), TU München
New measurement equipment at AC²T
Rainer Franz, AC2T research GmbH
Inspired by grease lubrication
Piet Lugt, SKF Research & Technology Development
Research in alternative fuels
Marcella Frauscher, AC2T research GmbH
Interesting innovations in tribology
Kartik Pondicherry, Anton Paar GmbH
Der Einstieg in die Tribologie
Mirjam Bäse, Magna Powertrain GmbH & Co KG & Gesellschaft für Tribologie e.V.
Highlights des ÖTG-Symposiums 2024
Andras Vernes, AC2T research GmbH
Fotos
ÖTG Seminar
19 November 2025, 9:00-13:00
Rheology in Tribology
Piet Lugt, SKF Research & Technology Development, NL
Seminar goals
- General concepts of rheology of fluids
- Influence of rheological properties on tribological processes
- Applications in practice and research
- Modern methods for the characterization of rheological properties
(The seminar will be held in English.)
Seminar content at a glance
- Viscosity
- Influence of shear, temperature, pressure and time on viscosity
- Newtonian and non-Newtonian behavior
- Piezo-viscosity
- Viscoelasticity
- Thixotropy and rheopexy
- Examples from practice
- Lubricating oils and greases in machine elements
- Biological systems, e.g. joint lubricants
- Food industry, e.g. chocolate
- Cosmetics, e.g. creams
- Measurement of rheological properties – Rheometry
Lecturers
TU Wien, Institute of Applied Synthetic Chemistry, AT
Prof. Liska received his Ph.D. in 1998 from the Vienna University of Technology and habilitated in 2006 in macromolecular chemistry. He leads the research group “Polymer Chemistry and Technology” with a focus on photoinitiation, photopolymerization, 3D printing, and biomedical polymers.
He has published over 250 peer-reviewed papers, co-authored 10 book chapters, and filed in more than 35 patent families. From 2012 to 2019, he headed the Christian Doppler Laboratory for digital and restorative dentistry.
He is member of the Austrian Cluster for Tissue Regeneration. In 2016, he became full professor for “Organic Technology” at TU Wien. His research has led to five start-ups, and in 2021 he received the H.F. Mark Medal.
Robert LISKA
TU Wien
University College London, Department of Mathematics, UK
Prof. Wilson is a Professor of Applied Mathematics at University College London (UCL) and Head of the Department of Mathematics.
Her research focuses on complex fluids, particularly non-Newtonian behavior such as viscoelastic fluids and particle suspensions. She investigates phenomena such as instabilities in elastic fluids and the interactions of particles in viscoelastic media.
Her work has applications in fields such as plastics processing, dental care products, and forensic science. Her pro-jects include the development of shear-thickening fluids for cryopreservation and the investigation of the rheology of toothpastes.
WILSON is also known for her popular science lectures, including „Blood, Mud and Chocolate: Weird Fluids for Everyone“ and „Anyone for a mince pi?“.
She was the first woman to head UCL’s mathematics department.
Helen J. WILSON
University College London
ÖTG Conference
20 November 2025 | 9:00-16:30
Plenum
Sustainable raw materials – An opportunity for biolubricants?
Biolubricants, understood as “rapidly biodegradable” and “environmentally friendly” as well as provided with official environmental labels such as the EU ecolabel, are not self-selling products on the market despite years of sustainability debate. Why this?
This talk begins by looking at sustainable raw materials and their use in the lubricant sector. It also addresses the different properties of the various types of base oil: Rheology, polarity, additive solubility, etc. The second part deals with ecolabels and adequate standardization for biolubricants.
Rolf LUTHER
Chairman of the GfT (DE)
Rheology in the coating industry
This talk reports on how rheological behaviour of insulating coating materials affects all aspects of coating processes, mostly uniform application and control to achieving smooth surfaces and optimal performance. In the winding wire industry, solvent release, rheological properties, and the reactivity of the film formers determine the quality of the insulating coating.
Important factors include good processability, no running, prevention of sedimentation, and uniform layer formation. Application of varnish is carried out in up to 30 layers, followed by firing at over 500°C and return of excess varnish. Obviously, viscosity measurements are crucial for raw material inspection, release in semi-finished and finished products, thus for the selection of suitable operating parameters and final product quality.
Suljo CIRAK
ASTA Elektrodraht GmbH (AT)
The importance of multidisciplinarity in tribology – from fundamentals to applications
The talk will cover recent advances in modelling aspects of a variety of problems where the behaviour of tribological interfaces controls the performance of engineering systems.
It will start with an overview of the modelling tools developed to study interfacial and rheological phenomena across the scales, and will then move onto demonstrating how in-silico experiments can be used to shed light on physical, chemical and mechanical phenomena that affect frictional interactions and engineering performance in several applications in the energy sector, including electric vehicles (EVs) and triboelectric nanogenerators (TENGs), biomedical applications, consumer goods, and functionalized and hierarchical materials and surfaces.
Daniele DINI
Imperial College London (UK)
Invited talks
Blood rheology on modified rheometer surfaces
Fresh blood contains living cells with different extrinsic (size, shape) and intrinsic (deformability, aggregability) properties, which influence the bulk blood flow. The proteins and small molecules in plasma generate a very diverse embedment for these cells by their sizes from the Angstrom scale (enzymes, factors, hormones) to several tens of nanometers (lipoproteins, ferritin) and by their functions (adhesion, signaling, mechanical coupling). It is evident that such a material has the ability for structuring, adhesive layer formation and phase separation in flow, and cannot be handled as a simple liquid. We show new data on the correlation between plasma proteins, highlighting the importance of this cellular embedment for blood flow.
The fate of such complex physiological liquids in the vicinity of an interface plays a crucial role in multiple situations. Direct contact with blood for long times can produce thrombus formation. Highly hydrophilic surfaces are beneficial for cell adhesion and growth, whereas highly hydrophobic surfaces are considered useful for mobile prostheses (e.g. cardiac valves). Also, the surface morphology of the material in contact plays an important role for wetting ability with liquids. Shear moduli vary substantially if the substrate is changed from classical steel to hydrophobic polydimethylsiloxan-coated plates. The gap dependency and the timely evolution of shear elasticity show that the liquid is no longer homogenous.
This presentation also shows examples of how a substrate can modify the reading of torques by rheometry and raises the question about which substrate is the best for the testing of physiological fluids.
Ursula WINDBERGER
Medical University Vienna (AT)
The role of lubricants in view of decarbonization and energy transition – Ammonia as carbon-free energy carrier
Decarbonization is enabled by using alternative energy carriers like green electricity and carbon-free fuels such as hydrogen and ammonia, and each of these require appropriate lubricants.
This talk discusses the opportunities and challenges of ammonia, emphasizing its potential application as a future marine fuel. A methodology specifically designed to capture critical oil performance parameters is presented which revealed the impact of ammonia on stability behaviour, corrosion properties, deposit formation, and tribological properties of fresh and aged engine oil.
Ewald BADISCH
AC2T research (AT)
The formation of drops and sprays from complex liquids
The formation of drops and sprays by breakup of coherent liquid systems is influenced by deformation-induced stresses in the liquid. These stresses, which depend on the rate of fluid deformation, are given by the rheological constitutive equation of the liquid. Turning from Newtonian to Non-Newtonian liquid behavior, i.e. to complex liquids, jet or sheet breakup by Plateau-Rayleigh or Kelvin-Helmholtz instability may change dramatically, with impact on the size spectra of the drops formed. Experiments show that even small contents of a macromolecular polymeric substance in a liquid may strongly change the elongational viscosity of the liquid, while the shear viscosity may be left widely unaffected. Consequently, the influence of elongational material behavior is predominantly seen in ligament-mediated sprays.
The present talk discusses the material characterization relevant for complex liquid jet and sheet breakup. Linear jet and sheet stability analysis predicts the growth rate of unstable disturbances for linear viscoelastic liquid materials to be enhanced as compared to a corresponding Newtonian liquid with the same Ohnesorge number. The conflict with the experimental observation that macromolecular solutes in a liquid rather stabilize jets and sheets than destabilizing them is due to nonlinear effects. Experiments show that drop size spectra formed by breakup of jets of poly(ethylene-oxide) solutions in water-glycerol mixtures may be close to those predicted for Newtonian liquids. Mean drop sizes measured in complex liquid sprays from pre-filming atomizers are well predicted by functions of the liquid flow Weber number and an elongational Reynolds number, interpreted as a Deborah number.
Günter BRENN
TU Graz (AT)
Technical talks
Schmieröle & -fette
Dynamic surface roughness modeling for enhanced slider bearing wear prediction
This study explores dynamic surface roughness adjustment to optimize slider bearing designs. A multi-body simulation framework combines Greenwood/Tripp contact mechanics and Archard’s wear model to track both wear depth and evolving surface roughness parameters. Simulations under realistic engine conditions revealed a 46% reduction in predicted wear when running-in effects were included, along with improved oil film stability. Dynamic updates prevented overestimation of wear and supported more accurate bearing life predictions.
These insights enable better lubrication strategies and surface treatments, enhancing reliability in automotive and industrial applications where slider bearings are critical.
Stephen BEWSHER
AVL List GmbH (AT)
Exploiting fluid viscoelasticity for enhanced load capacity in 3D-lubricated contacts
Viscoelasticity in lubricants, arising from finite polymer relaxation time, can significantly enhance the load-carrying capacity of hydrodynamic contacts such as bearings, gears, and textured surfaces. Using reduced-order approaches – including a viscoelastic Reynolds formulation and first-order perturbation in the Deborah number (De, ratio of relaxation to flow time scale) – we analyse conical, textured, and finite-width channel geometries.
Results show that viscoelasticity improves film performance beyond Newtonian predictions, though alignment errors and spanwise effects introduce nonlinear trends, including saturation or reduction at high De. These findings highlight both opportunities and challenges in exploiting viscoelasticity for lubrication under extreme conditions.
“HPC_BIG_DATA_QUANTUM – National Center for HPC, Big Data and Quantum Computing – E13C22001000006 – Decreto MUR n. 1031 del 17/06/2022.”
Luca BIANCOFIORE
University of L’Aquila (IT)
From interface science to green synthesis of 2D materials: a pathway toward sustainable lubrication
MXenes are a class of two-dimensional materials known for their exceptional physical and chemical properties. Their technological advancement has been hindered by safety concerns, as conventional synthesis methods often involve hazardous chemicals.
In this work, I will present how we leveraged the principles of interface science, specifically surface nanobubbles, to enhance electrochemical synthesis and produce high-quality MXenes with significantly improved yield. I will discuss their surface terminations, which differ from classical MXenes. Furthermore, I will demonstrate the outstanding tribological performance of these materials discussed at the macro and nanoscale, establishing a new benchmark in the development of sustainable solid lubricants
Pierluigi BIOLOTTO
TU Wien (AT)
Werkstoffe & Oberflächen
Atomistic simulations to aid viscosity prediction and lubricant additive design
This contribution shows how atomistic simulations can help design better lubricants. We first explore how molecular motion at the nanoscale determines viscosity under different temperatures, pressures, and shear conditions, and how these data can be combined into a single, consistent description of fluid behavior. In the second part, we use chemical simulations to study antioxidant additives made from renewable sources such as lignin, focusing on their stability and ability to protect base oils from oxidation.
Together, these studies illustrate how molecular modeling can support the development of efficient and sustainable lubrication technologies.
Stefan J. EDER
AC2T research GmbH
TU Wien (AT)
Case study on oil condition monitoring – A practical and effective approach from sampling strategy to corrective actions
The relevance and benefits of oil condition monitoring in industrial environments are beyond question. Numerous service providers are available to support industrial companies in carrying out the various associated activities. Alternatively, certain aspects or the entire process can be managed internally by the company itself.
In this presentation, a targeted overall solution will be introduced using a practical example from an Austrian industrial company. The key feature is a software solution serving as the central interface for managing technical equipment, planning and recording measurement data, and suggesting corrective actions.
The specific implementation example within this industrial company illustrates the challenge of harmonizing smooth operational processes with the direct integration of analytical instruments.
Thomas FEISCHL
eralytics GmbH (AT)
Porous pathways to low friction: The tribology of MOFs
Metal-organic framework (MOF) nanoparticles emerge as effective lubrication additives. This study highlights the impressive solid lubrication performance of a Ti-based MOF, COK-47, which reduces friction by 8.5 times compared to AISI 304 steel. COK-47 consistently maintains a low coefficient of friction (0.1-0.2) across various materials, including Al2O3 and Si3N4, outperforming other MOFs and 2D materials.
The formation of a tribofilm through the hydrolysis of COK-47 in moisture is confirmed, with density functional theory indicating that water supports its decomposition. This research emphasizes the potential of MOF and water-assisted lubrication in advancing tribology.
Carsten GACHOT
TU Wien (AT)
Komponenten & Systeme
The development and characterization of automotive brake pad friction materials, focusing on incorporating novel 2D materials as solid lubricants
This study evaluates titanium-based MXene (Ti₃C₂Tₓ) as a superior solid lubricant for brake pads, comparing it to conventional molybdenum disulfide (MoS₂) and a hybrid of both. Incorporated into a fixed matrix, the composites were analyzed for thermal, mechanical, and tribological properties. Pin-on-disk testing against grey cast iron revealed that Ti₃C₂Tₓ significantly outperforms MoS₂.
The hybrid formulation reduced the specific wear rate by 16.5%, while the Ti₃C₂Tₓ-only composite achieved a substantial 48.5% reduction in wear compared to the MoS₂-based material, demonstrating MXene’s exceptional potential for enhancing brake pad durability and performance.
Eslam MAHMOUD
TU Wien (AT)
Innovative 2D materials for reducing friction: ab initio simulations coupled with experiments
In the quest for efficient solid lubrication under extreme conditions, two-dimensional materials such as graphene and MoS2 have emerged as powerful alternatives to conventional liquid lubricants. The exploration of novel 2D compounds represents an expanding frontier in tribology, demanding a multidisciplinary approach that bridges chemistry, physics, and materials engineering.
This talk will highlight recent advances in understanding the tribological behavior of next-generation 2D materials through the combined use of density functional theory simulations and experiments. Particular attention will be devoted to MXenes (Ti3C2Tx), transition metal carbochalcogenides (Nb2CS2), and 2D metal organic frameworks, as promising solid lubricant candidates of the future.
Edoardo MARQUIS
TU Wien (AT)
Pin-on-disc tests for biomedical materials and medical devices
Friction plays a crucial role in biomedical applications, from knee implants that require low friction for smooth movements, to implants where controlled friction at the implant bone interface aids osseointegration, and catheters that must slide easily into blood vessels or urethra. Although simple, the pin-on-disc method remains essential for providing reliable and meaningful data when tribological conditions are known or well estimated.
In this contribution we present three case studies: frictional analysis of hip implants against bone, evaluation of protective coatings on knee implants, and comparison of coated catheters. These results demonstrate the method’s versatility of simulating realistic biomedical conditions.
Jiri NOHAVA
Anton Paar TriTec SA (CH)
Investigation of solid self-lubrication mechanisms of B2O3 in TiB2±z and WB2±z based thin films
Transition metal borides such as TiB2±x and WB2±x are promising materials for protective coatings, because they combine high hardness with self-lubricating properties. At high temperatures, they form a thin B2O3 layer that helps reduce friction. Super-stoichiometric TiB2.9 shows lower friction than TiB1.5 because the extra boron produces more lubricating oxide. Similarly, α-WB2±z coatings also exhibit self-lubrication properties.
However, they tend to stabilize in the sub-stoichiometric form, resulting in reduced amounts of boron available for oxidation. The tribological data are further correlated with XPS, XRD, and TEM analyses, offering new insights into the lubrication mechanisms of boron oxide in thin films
Daniel PÖLZLBERGER
TU Wien (AT)
Under (hydrodynamic) pressure – A novel test methodology to compare the performance of different textures under varying conditions
A numerical approach is used to identify optimal parameters for single- and multi-dimple textured convergent oil film gaps that can be practically manufactured by milling. Furthermore, a novel test method is developed on an Anton Paar MCR rheometer to evaluate these textures in full-film lubrication, varying rotational speed, temperature, and minimal oil film gap height.
Results show that single-dimple textures achieve the highest load-carrying capacity. At 23°C, both textures reduce drag compared to untextured gaps, though this benefit diminishes with rising temperature. Nevertheless, the load-carrying capacity of textured surfaces consistently exceeds that of untextured oil film gaps.
Raphael SCHARF
Montanuniversität Leoben (AT)
Experimental investigation of tire wear particle sizes
The new EURO 7 emission standard includes, for the first time, tire wear. Previous research has given relatively little attention to the distribution of tire wear particle sizes; however, this is important in determining their environmental impact.
Therefore, this study employed a mini traction machine to simulate real-world tire abrasion, using a ball made of tire material, and an asphalt disc composed of gravel and bitumen. Various tests were conducted with different normal loads, slip ratios, and velocities, and the generated particles were analyzed with a laser diffractometer, classifying them by size.
Alexander SCHMIEDHOFER
TU Wien (AT)
Impedance measurement in bearings for lubricant testing and condition monitoring
The lubrication condition is a determining factor for the lifetime of bearings. By detecting the electrical potential between bearing and shaft, the lubrication condition can be monitored.
in this talk, we introduce a method that applies a high frequency impedance signal. In various applications it could be shown that valuable information for lubricant development and condition monitoring is achieved:
- Stribeck curve in real application
- Pitting development from initiation to particle
- Development of surface layers, protective reaction layers or varnish
- Development of oil ageing: particle generation, contamination
- Forces in bearings in real application
Christoph WINCIERZ
HCP Sense GmbH (DE)
Organisational Committee
Priv.-Doz. Dipl.-Ing Dr.
Nicole Dörr
ÖTG
Ernst-Dieter Janotka
ÖTG
Univ.-Prof. Dr.-Ing.
Carsten Gachot
ÖTG & TU Wien
Institute of Engineering Design and Product Development
Priv.-Doz. Dipl.-Ing. Dr.
Bernhard Scheichl, Hon. Assoc. Prof.
TU Wien
Institute of Fluid Mechanics and Heat Transfer
Dr.
Timea Erzsebet Varadi, MSc.
Floridsdorf Clinic
Medical Physics Unit
Venue, travel & accommodation
Anton Paar GmbH
Anton-Paar-Straße 20, 8054 Graz, Austria
Information regarding the venue, travel and accommodation can be found here.
Call for Abstracts
Please send your name, organization, title and an abstract of max. 100 words of your contribution to office@oetg.at until 10 October 2025.
As soon as your contribution has been accepted, please send us a high-resolution portrait photo and register for the symposium.
Call for Posters
Please send your name, organization, title and an abstract of max. 100 words of your poster to office@oetg.at until 10 October 2025.
As soon as your poster has been accepted, please send us a high-resolution portrait photo and register for the symposium.
Your poster will be presented in the break area.
Exhibition stand
10At the same time as the Conference, a trade exhibition will be organized in the large break area.
Please send your name, organization and information of your stand (e.g. electricity, monitor, table) to office@oetg.at until 10 October 2025.
Registration
The participation fee includes the conference materials (online), the seminar, the conference and refreshments during breaks and lunch. Prices exclude VAT.
Contact
Dr. Nicole Dörr
President
Ernst-Dieter Janotka
Secretary General
If you have any questions about the ÖTG Symposium 2025, please feel free to contact us.
Sponsors
