TY - CONF A1 - Woydt, Mathias T1 - Fuel economy through engine oils based on polyalkylene glycols T2 - Tribologie-Fachtagung 2011 CY - Göttingen, Germany DA - 2011-09-26 PY - 2011 AN - OPUS4-24531 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Scholz, Christian A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - Höchstbelastbare Wälzkontakte mit geringer Misch-/Grenzreibungszahl N2 - Leichtbaustrategien im Antriebsstrang erhöhen durch Downsizing die Hertz’schen Kontaktpressungen und die mechanischen Lasten. Dadurch müssen neben wälzbeständigen Stählen auch dazu passende reibungsmindernde Konzepte gefunden werden, in der vorliegenden Arbeit wurden alternative, hoch zähe Stähle mit einer Wälzbeständigkeit bis Pomax = 4,2 GPa untersucht, welche mit geeigneten Grundöl- und Additivkombinationen die Reibungszahlen herunter auf 0,025 reduzieren konnten. Diese alternativen Stahllegierungen erlauben nicht nur an der Zahnflanke sehr hohe Kontaktpressungen, sie bieten außerdem entsprechende Zähigkeits- und Festigkeitseigenschaften für den Zahnfuß. In vorangegangenen Untersuchungen wurde eine Vielzahl verschiedener Dünnschichten auf ihre Überrollbeständigkeit unter Extrembeanspruchungen validiert. Allerdings zeigte sich bei den meisten Dünnschichten ein Qualitätsunterschied von Charge zu Charge. Unter Verwendung verschiedener organischer, metallorganischer und anorganischer Additive konnten, sich daran anschließende Versuche, vielversprechende Ergebnisse erzielt werden. Sämtliche Versuche unter extremen Beanspruchungen wurden bei +120°C Öltemperatur auf Zwei-Scheiben-Tribometern vom Typ AMSLER und 2Disk von Optimol Instruments unter Misch-/Grenzreibungsbedingungen durchgeführt und die tribologischen Eigenschaften der neuartigen, unbeschichteten Stähle und in Relation zu leistungsstarken DLC-/ZrCN Dünnschichten gesetzt. T2 - 52. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen CY - Göttingen, Deutschland DA - 26.09.2011 KW - Hochzähe Stähle KW - DLC KW - ZrCN KW - Dünnschichten KW - Extrembeanspruchung KW - Polyglykole KW - Additive PY - 2011 SN - 978-3-00-035439-7 VL - I SP - 11/1 EP - 11/16 AN - OPUS4-24611 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gili, F. A1 - Igartua, A. A1 - Luther, R. A1 - Woydt, Mathias T1 - The impact of biofuels on engine oil performance N2 - The dilution of biogenic fuels into lubricating engine oils often leads to a shortening of the recommended oil drains (between 30% and 60%) and an increase in wear. The large number of overlapping and influencing factors, of which dilution and polymerization of fuel components in the engine oil are emphasised, makes it difficult to find a uniform solution to prevent failures in the various applications. Insofar single solutions for the different types of biofuels are needed. The contribution of base oil chemistry and additives as well as triboactive materials is featured to deal with the adverse effects of biofuels. In the frame of the European Commission (EC)-funded project 'cleanengine', tentative engine oils based on esters with a content of renewables and polyglycols are formulated to increase the lubricant's tolerance in engines fuelled with biofuel-based blends, with the aim of ensuring required lubricating and wear protection performance while keeping oil drain intervals unchanged. The present paper focuses on four-stroke diesel applications, fuelled by biodiesel (fatty acid methyl ester — FAME) as well as by rapeseed oil and Jatropha oil (pure vegetable oils, triglycerides), together with relevant blends of those biofuels and conventional diesel fuel. This paper screens the functional profile (in particular rheological, toxicological, bio-compatibility, tribological and biofuels affinity) of lube families with respect to biofuel contamination. Moreover, this is followed by the contributions of piston ring and liner materials as well as thin film coatings. KW - Lubricants KW - Engine oil KW - Additives KW - Biofuel KW - Ester KW - Polyglycol KW - Thin film coatings KW - Slip-rolling KW - DLC KW - Dilution KW - FAME KW - Jatropha KW - Rapeseed KW - Stem valve KW - Piston ring PY - 2011 DO - https://doi.org/10.1002/ls.158 SN - 0954-0075 SN - 1557-6833 VL - 23 IS - 7 SP - 313 EP - 330 PB - Leaf Coppin Publ. Ltd. CY - Deal AN - OPUS4-24831 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gili, F. A1 - Igartua, A. A1 - Luther, R. A1 - Woydt, Mathias T1 - The impact of biofuels on engine oil's performance T2 - 17th International colloquium tribology CY - Esslingen, Germany DA - 2010-01-19 KW - Lubricants KW - Engine oil KW - Additives KW - Bio-fuel KW - Ester KW - Polyglycol KW - Thin film coatings KW - Slip-rolling KW - DLC KW - Dilution KW - FAME KW - Jatropha KW - Rape seed KW - Stem valve KW - Piston ring PY - 2010 SP - 17_Woydt_Biofuels_Plenary, 1 EP - 13 AN - OPUS4-24832 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - DOW PAG engine oil - Fuel economy through engine oils based on polyalkylene glycols T2 - 3. Int. Exhaust Emissions Symposium and Celebrations to mark BOSMAL's 40th anniversary CY - Bielsko-Biala, Poland DA - 2012-05-24 PY - 2012 AN - OPUS4-25912 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Progris, R. A1 - Robbe-Valloire, F. A1 - Richard, J. A1 - Aye, J. A1 - Woydt, Mathias T1 - Biolubrifiants PY - 2013 SN - 978-2-85059-309-3 N1 - Serientitel: Techniques de l'ingénieur – Series title: Techniques de l'ingénieur SP - 139 EP - 152 PB - Editons TI CY - Paris AN - OPUS4-25589 LA - fra AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Fuel economy through engine oils based on polyalkylene glycols T2 - 18. Int. Colloq. Tribology - Industrial and Automotive Lubrication CY - Ostfildern, Germany DA - 2012-01-10 PY - 2012 AN - OPUS4-25342 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Nullverschleiß T2 - Tribologie-Kolloquium (TU Chemnitz) CY - Chemnitz, Germany DA - 2012-06-21 PY - 2012 AN - OPUS4-26031 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Igartua, A. A1 - Fernandez, X. A1 - Woydt, Mathias A1 - Luther, R. A1 - Illarramendi, I. ED - Lakshminarayanan, P.A. ED - Nayak, N.S. T1 - Tribological tests to simulate wear on piston rings N2 - In order to reduce experimental effort, tribological tests are performed for coating selection, simulating the friction, wear and scuffing behaviour between the piston ring and cylinder liner, as well as lubricant evaluation. The creation of test standards in piston ring/cylinder liner simulation is discussed. PVD coatings, HVOF coatings and nitriding treatments have been applied to piston rings as alternative for chromium coatings. CrN/TiN coating seems very effective for increasing the wear and scuffing resistance. Biodegradable engine oils based on esters and polyglycols reduce friction and exceed the wear resistance of reference engine oils based on hydrocarbons for the new generation engines with high cylinder pressures. KW - Friction KW - HVOF KW - Chromium KW - CrN/TiN KW - Scuffing KW - Wear KW - Resistance KW - Tribo-system KW - Piston ring KW - Cylinder liner KW - SRV Test KW - Schwingung KW - Reibung KW - Verschleiß KW - Oscillation KW - Friction and Wear KW - Extreme pressure test KW - Coating KW - Physical vapour deposited coating (PVD) KW - High Pressure–High Velocity Oxi-fuel coating (HP-HVOF) KW - Friction coefficient KW - Wear scar KW - Lubricant KW - Bio-degradable lubricant KW - Ester KW - Glycol KW - Viscosity index KW - Viscosity grade KW - Thematic piston ring PY - 2011 SN - 978-0-470-82882-3 DO - https://doi.org/10.1002/9780470828847.ch11 IS - Chapter 11 SP - 167 EP - 195 PB - John Wiley & Sons AN - OPUS4-26253 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - International Standardisation of the SRV-Testing-Techniques T2 - Tokyo Univeristy of Science CY - Tokyo, Japan DA - 2013-02-12 PY - 2013 AN - OPUS4-27718 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -