TY - GEN A1 - Woydt, Mathias A1 - Skopp, André A1 - Kelling, Norbert A1 - Berger, L.-M. ED - Suchanék, J. T1 - Tribological Characterization of Titanium Suboxide Coatings Prepared by VPS Spraying T2 - 4th International Tribology Conference "Tribology of Surface Layers and Coatings" CY - Prague, Czech Republic DA - 2004-06-17 KW - Titanium oxide coatings KW - Thermal spraying KW - Unlubricated sliding wear KW - Lubricated sliding wear KW - Lubricants PY - 2004 SN - 80-2393123-7 PB - Czech Tribology Society CY - Prag AN - OPUS4-3638 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Woydt, Mathias A1 - Skopp, André A1 - Kelling, Norbert A1 - Berger, L.-M. T1 - Thermally sprayed TiO2-x coatings under mixed lubrication and unlubricated sliding conditions T2 - Tribologie-Fachtagung 2004 CY - Göttingen, Deutschland DA - 2004-09-27 KW - Thermisch gespritzte Schichten KW - TiOx KW - Magnéli-Phasen KW - Tribologische Prüftechnik KW - Reibung KW - Verschleiß KW - Kolbenring/Zylinderlaufbahn PY - 2004 SN - 3-00-015053-6 SP - 1(?) EP - 13(?) PB - Ges. für Tribologie CY - Moers AN - OPUS4-4396 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Skopp, André A1 - Kelling, Norbert A1 - Woydt, Mathias A1 - Berger, L.-M. T1 - Thermally sprayed titanium suboxide coatings for piston ring/cylinder liners under mixed lubrication and dry-running conditions N2 - Two new substoichiometric titania (TiOx) coatings designated for cylinder liner application were deposited on specimen of grey cast iron GG20HCN with high carbon content by plasma spraying. First, a TinO2n-1 coating was prepared by atmospheric plasma spraying (APS) using a sintered and agglomerated Magnéli-type spray powder. Second a TiO1.95-x coating was deposited with a vacuum plasma spray (VPS) process using a commercial, fused and crushed TiO1.95 powder. The tribological behaviour of these coatings under lubricated conditions was compared with uncoated specimen of this grey cast iron. As counter bodies a widespread used APS-sprayed Mo-NiCrBSi piston ring coating (MKP81A®), an advanced HVOF-sprayed WC/Cr3C2-based (MKJet502®) ring coating as well as non-commercial prototype APS-sprayed TinO2n-1 and APS-sprayed (Ti,Mo)(C,N) + 23NiMo (TM23-1) coatings were tribotested. The interaction of the pairs with prototype engine oils based on esters and polyglycols were studied under mixed/boundary lubrication using the BAM test method. Lubricants were factory fill engine oils, ester-containing lubricants with low-SAP (sulphur–ash–phosphor) and/or bio-no-tox properties as well as polyglycole-based lubricants. The ester and polyglycole-based engine oils respond both to bio-no-tox criteria and are polymer-free. They follow different strategies to reduce zinc, phosphorus and sulphur to assure a low ash content. Both TiOx coatings designated for cylinder liners meet or exceed the wear resistance of the grey cast iron with high carbon content when paired with APS-sprayed TinO2n-1 or Mo-NiCrBSi piston ring coatings. Overall, in nearly all pairs the wear rates of the APS TinO2n-1 coating were lower than those of the VPS TiO1.95-x coating. In order to characterize the tribological behaviour under oil-off, dry-running conditions, additional tests were performed under unlubricated unidirectional sliding conditions at 22 and 400 °C for a sliding speed of 1 m/s against sintered polycrystalline Al2O3 as stationary specimen. KW - Thermally sprayed coatings KW - Triboactive coatings KW - Magnéli phases KW - Piston ring/cylinder liner wear simulation under mixed/boundary lubrication KW - Bio-oils (ester, PAG, glycols, bio-no-tox, low ash) PY - 2007 SN - 0043-1648 VL - 262 IS - 9-10 SP - 1061 EP - 1070 PB - Elsevier CY - Amsterdam AN - OPUS4-14646 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -