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Satapathy B.K.,Indian Institute of Technology Delhi | Patnaik A.,N.I.T. | Dadkar N.,Indian Institute of Technology Delhi | Kolluri D.K.,Tribology Laboratory | Tomar B.S.,Allied Nippon Industries
Materials and Design | Year: 2011

Flyash-based fibre-reinforced hybrid phenolic composites filled with vermiculite were fabricated and characterized for their physical, thermal, mechanical and tribological performance. The performance were evaluated in terms of their friction-fade, friction-recovery, maximum disc temperature rise and wear behaviour on a Krauss friction tester conforming to the Regulation-90 as per the Economic Commission for Europe (ECE) norms. The fade behaviour has been observed to be optimally dependent on the flyash-vermiculite combination whereas the recovery remained broadly unaffected at ∼112±14%. Addition of vermiculite has contributed to the reduction in the maximum disc temperature rise whereas it enhanced the frictional amplitude, i.e μmax-μmin. The wear behaviour remains closely related to the trend observed in fade. The addition of vermiculite has caused an increase in the post-braking onset of degradation temperature of the surface composition as compared to the pre-braking composition. The analyses of friction and wear performance of the composites were carried out and major factors influencing the tribo-performance were identified. Worn surface morphology investigation using scanning electron microscope has revealed that the addition of vermiculite alters the compositional interactions at the braking interface leading to flyash-vermiculite combination specific topographical attributes responsible for tribo-performance evolution. © 2011 Elsevier Ltd. Source


Abdul Hamid M.K.,University of Technology Malaysia | Stachowiak G.W.,Tribology Laboratory
Advanced Materials Research | Year: 2011

The effect of grit particle size on frictional characteristics was investigated using a vertically oriented brake test rig. Silica sand of grit sizes 50-180 μm, 180-355 μm and 355-500 μm were used in drag mode application. Results showed that the presence of hard particles from environment can influence the friction response significantly. Basically, once the hard particles enter the gap, the value and amplitude of friction coefficient tend to decrease. However, slight increase in friction with smaller particles was recorded due to more hard particles involved in mixing and changing the effective contact area. Better friction stability was related to the presence of smaller grit particles and compacted wear debris to form frictional film on the braking interface. © (2011) Trans Tech Publications. Source


Papageorgiou N.,Tribology Laboratory | Mischler S.,Ecole Polytechnique Federale de Lausanne
Tribology Letters | Year: 2012

Valuable insights into the wear-corrosion behavior of metals, as well as into the tribocorrosion field through the development of simulation models of tribocorrosion experiments, can contribute in rationalizing wearaccelerated experiments and their open circuit potential (OCP) behavior under rubbing. These results demonstrate that mathematical models of controlled tribo- electrochemical contacts can complement the physical experiment and add valuable understanding to the tribological behavior of metals, alloys, and generally to materials in an electrochemically active environment. The excellent agreement of experimental wear data and the experimental OCP curves with the OCP simulations with time establishes the concepts underlying the galvanic coupling model as a valid methodological approach toward a quantitative description and mechanistic understanding of the tribo-electrochemical experiment. Besides analyzing stellite tribocorrosion, application of the model to Al alloy data has helped us quantify the relative contributions of chemical and mechanical wear and reveal the underlying synergy. Ti metal tribocorrosion under variable load has revealed that the contact pressure Pav, can reach much lower values within the experimental time domain and finally be the cause of interruption of the initial wear mechanism. © Springer Science+Business Media, LLC 2012. Source


Kumar M.,National Institute of Technology Hamirpur | Satapathy B.K.,Indian Institute of Technology Delhi | Patnaik A.,National Institute of Technology Hamirpur | Kolluri D.K.,Tribology Laboratory | Tomar B.S.,Allied Nippon Industries
Tribology International | Year: 2011

Composite friction materials based on synergistic ternary combination of potassium titanate whiskers, aramid fibre and graphite have been characterized for friction braking performance on Krauss friction tester. The dynamics of friction build-up and friction-decay as a function of number of braking instances and modes of braking cycles have been found to be more consistent in the composites with <7.5 wt% of aramid fibres whereas the absolute friction effectiveness remained higher in the composites with <25 wt% of potassium titanate whiskers. Wear surface morphology has revealed topographical variations and their underlying role in controlling the friction and wear performance. © 2010 Elsevier Ltd. All rights reserved. Source


Home > Press > SENAI Outfits New Tribology Lab with Bruker UMT TriboLab Systems: Brazil’s National Service for Industrial Training Invests in Six Bruker Tribometers Abstract: Bruker has announced the installation of six UMT TriboLab Mechanical Testers at the Tribology Laboratory of Innovation SENAI Institute for Surface Engineering in Belo Horizonte, Brazil. Established by Brazil’s National Service of Industrial Training (SENAI), the new state-of-the-art laboratory will utilize the TriboLab systems to carry out research and development of products focused on the evaluation of materials performance for resistance to wear. The TriboLab systems enable the new laboratory to test real-use conditions across an extremely wide range of industrial products, from automotive engine components and hydraulic pumps to cutting tools and aeronautical turbines. “After our purchase of six UMT TriboLab systems we received visitors from large companies who were very interested to learn about our laboratory,” said Dr. Karyne Juste, ISI Surface Engineering Researcher at SENAI. “They were really impressed with the large number of different tribological tests that we are now able to offer. Working in different market segments, such as mining, automotive, and aeronautical industries, our visitors also emphasized the great relevance of having these services available in Brazil.” “Bruker was very pleased to help equip such an important tribology laboratory in Brazil,” added James Earle, Vice President and General Manager of Bruker’s Tribology, Stylus and Optical Metrology Business. “The TriboLab systems that have been installed allow them to run a comprehensive range of tests, from nanoindentation up to high-load tribology testing under vacuum. SENAI is a very important reference customer, and we look forward to working with Dr. Juste and her team as they support customers throughout South America with advanced tribology testing.” About Bruker Corporation For more than 50 years, Bruker has enabled scientists to make breakthrough discoveries and develop new applications that improve the quality of human life. Bruker’s high-performance, scientific research instruments and high-value analytical solutions enable scientists to explore life and materials at molecular, cellular and microscopic levels. In close cooperation with our customers, Bruker is enabling innovation, productivity and customer success in life science molecular research, in applied and pharma applications, in microscopy, nano-analysis and industrial applications, as well as in cell biology, preclinical imaging, clinical research, microbiology and molecular diagnostics. About UMT TriboLab The UMT was first introduced in 2000 and rapidly became the quasi-standard for tribology and mechanical test labs around the world. With an improved platform offering many new ease-of-use and productivity features, the UMT TriboLaboffers comprehensive TriboScript™ software package to allow users to intuitively program complex motions and to control applied forces with unprecedented accuracy. Modular environmental chambers can be added or removed in minutes to enable users to adjust temperature or humidity to simulate real-world conditions. Other features include an integrated high-torque motor, built-in analog sensor protection for increased safety, and a comprehensive range of accessories to facilitate a wide range of tribology tests. Only the UMT TriboLab system enables easy and accurate transformation from rotary to reciprocating or linear motion, sub-Newton to kilo-Newton force measurement, or environmental testing from room temperature up to 1000°C. About SENAI The National Service for Industrial Training (Serviço Nacional de Aprendizagem Industrial, SENAI) is responsible for professional and vocational training and also seeks to cultivate international business relationships. With the newly planned research institutes, SENAI intends not just to promote vocational training for industry and business, but also to promote applied research across the country. Currently, SENAI has a total of 26 innovation institutes across nearly all federal states in Brazil, with each institute operating in a specific technical area. The SENAI Institute of Innovation on Surface Engineering offers solutions for increased performance, reliability, competitiveness and quality of products, components and systems by changing their surface properties. For more information, please click If you have a comment, please us. Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

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