TY - CONF A1 - Woydt, Mathias A1 - Mohrbacher, H. A1 - Vleugels, J. A1 - Huang, S. T1 - Substitution of tungsten carbide by niobium carbide as cutting materials and for wear protection N2 - Im binären System NbC-C existieren verschiedene Phasen im Homogenitätsbereich NbCₓ, mit 0,75 ≤ x ≤ 1,0, wie NbC, Nb₆C₅ und Nb₄ C₃ , die ein breites Prozessfenster beim Sintern und in der Werkstoffentwicklung ermöglichen. Die Mikrohärte, die Warmhärte, der Verschleißwiderstand, das Elastizitätsmodul und die Zähigkeit von Hartmetallen hängen vom C/Nb-Verhältnis ab, wie auch von der Zugabe von Sekundärcarbiden. N2 - Several phases, like Nb₄ C₃ , Nb₆C₅ and other short and long range ordered phases occur in the region of homogeneity of NbCₓ (0.75 ≤ x ≤ 1.0) in the binary phase diagram. Properties, like micro-hardness, hot hardness, sliding wear resistance, elastic modulus and toughness can be tailored by the C/Nb ratio, the addition of secondary carbides and the type of binder. Supporting results from different grades with varying C/Nb ratio or binder types were illuminated. Thus, the NbC system offers to producers a wider process window, than WC. The impact of these tailored properties on sliding wear and cutting performance was illuminated by tribological and machining results. Niobium is today largely available. NbC can be synthesized by carbothermal conversion of Nb₂O₅ or be metallurgically grown and leached out, provides comparably low friction in many relevant tribo-contacts and displays low wear. NbC and Nb₂O₅ have so far no REACH classification related to human toxicology and are not listed as substances of very high concern contrary to WO₃ and Co₃ O₄ . T2 - 57. Tribologie-Fachtagung CY - Göttingen, Germany DA - 26.09.2016 KW - cutting materials KW - niobium carbide KW - wear protection PY - 2016 SN - 978-3-9817451-1-5 SP - 65/1 EP - 65/14 AN - OPUS4-37833 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias A1 - Huang, S. A1 - Vleugels, J. A1 - Mohrbacher, H. A1 - Cannizza, E. T1 - Potentials of niobium carbide (NbC) as cutting tools and for wear protection N2 - Research and development of WC grades is 90 years ahead of niobium carbide-based hard materials, which showed already as light-weight and unexplored material a very high potential for many technical applications, especially for wear protection and machining. NbC evoluted recently from lab scale to pilot scale, especially in areas where established WC-based materials are causing economic, environmental or technical concerns. Benchmark trials of NbC-based hard metals indicated already a favorable performance in machining of steel components. KW - Niobium carbide KW - Friction KW - Wear KW - NbC KW - Hard metals KW - Machining KW - Nickel PY - 2018 DO - https://doi.org/10.1016/j.ijrmhm.2018.01.009 SN - 0263-4368 VL - 72 SP - 380 EP - 387 PB - Elsevier Ltd. AN - OPUS4-44166 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Huang, S. G. A1 - Vleugels, J. A1 - Mohrbacher, H. A1 - Woydt, Mathias T1 - NbC-based cermets: influence of secondary carbide addition and metal binder N2 - Full densification of Fe, Co and Ni bonded NbC based cermet’s was achieved by pressure less liquid phase sintering in vacuum for one hour at 1420°C. The hardness and toughness of the NbC matrix cermet’s can be mainly tailored by the binder composition and secondary carbide additions. Ni binder based NbC cermet’s allow the combination of high hardness and improved toughness. The addition of lesser amounts of VC/Cr3C2 in a NbC partially substituted WC-Co cemented carbide increased significantly the hardness in combination with a moderate fracture toughness. T2 - International Symposium on Wear Resistant Alloys for the Mining and Processing Industry CY - Sao Paulo, Brazil DA - 04.05.2015 KW - Niobium carbide KW - Hardmetal KW - Cemented carbide KW - Sintering KW - Grain growth KW - Microstructure KW - Hardness KW - Fracture toughness PY - 2018 SN - 978-0-692-05382-9 SP - 521 EP - 534 AN - OPUS4-44206 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Huang, S. A1 - De Beats, P. A1 - Sukumaran, J. A1 - Mohrbacher, H. A1 - Woydt, Mathias A1 - Vleugels, J. T1 - Effect of carbon content on the microstructure and mechanical properties of NbC-Ni based cermets N2 - The aim of this work was to correlate the overall carbon contents in NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo starting powders with the resulting microstructure, hardness, and fracture toughness of Ni-bonded NbC cermets. KW - Niobium carbide KW - Cermet KW - Hardmetal KW - Liquid phase sintering KW - Carbon KW - Hardness PY - 2018 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-444608 DO - https://doi.org/10.3390/met8030178 SN - 2075-4701 VL - 8 IS - 3 SP - Article 178, 1 EP - 13 PB - MDPI AN - OPUS4-44460 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Huang, S. G. A1 - Vleugels, J. A1 - Mohrbacher, H. A1 - Woydt, Mathias T1 - Effect of Ti(C0.7N0.3) content on the microstructure and mechanical properties of Ni bonded NbC-Ti(C0.7N0.3) based cermets N2 - In the present work it was shown that the addition of VC or a combination of VC + Ti(C0.7N0.3) was efficient in reducing the NbC grain growth during liquid phase sintering, when compared to NbC-Ni equivalents. A finest NbC grain size of 1.48 µm was obtained in the NbC-15 Ti(C0.7N0.3)-10 Ni-7.5 VC cermet, exhibiting a hardness of 1486 +/- 7 kg/mm2 and a fracture toughness of 8.7 +/- 0.1 MPa m 1/2. KW - Cermet KW - Niobium carbide KW - Carbonitride KW - Sintering KW - Mechanical properties PY - 2018 DO - https://doi.org/10.4028/www.scientific.net/SSP.274.43 SN - 1662-9779 VL - 274 SP - 43 EP - 52 PB - Trans Tech Publ. CY - Uetikon AN - OPUS4-44962 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Huang, S. G. A1 - Vleugels, J. A1 - Mohrbacher, H. A1 - Woydt, Mathias T1 - Microstructure and mechanical properties of NbC matrix cermets using Ni containing metal binder N2 - The current study reports on the effect of the addition of Al metal and secondary refractory carbides on the microstructure and mechanical properties of Ni bonded NbC matrix cermets. KW - NbC KW - Niobium carbide KW - Hardness KW - Hard materials PY - 2016 DO - https://doi.org/10.1016/j.mprp.2016.05.009 VL - 71 IS - 5 SP - 349 EP - 355 PB - Elsevier Ltd. AN - OPUS4-44623 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias A1 - Mohrbacher, H. A1 - Vleugels, J. A1 - Huang, S. T1 - Potentials of niobium carbide (NBC) as cutting tools and for wear protection N2 - Niobium is today largely available. NbC displayed lower dry sliding friction over WC grades. The softer Ni- and NiMo-bonded NbC1.0-grades have a higer abrasive wear resistance (ASTM G65), even with lower toughnesses, than the tougher WC-Co grades and harder NbC-Co grades. T2 - 41st International Conference and Exposition on Advanced Ceramics and Composites CY - Daytona Beach, FL, USA DA - 22.01.2017 KW - Niobium Carbide (NbC) KW - Cutting tool KW - Hardness KW - Friction PY - 2017 VL - 38 SP - 1 EP - 13 AN - OPUS4-43430 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Huang, S. G. A1 - Vleugels, J. A1 - Mohrbacher, H. A1 - Woydt, Mathias T1 - NbC grain growth control and mechanical properties of Ni bonded NbC cermets prepared by vacuum liquid phase sintering N2 - The current study reports on the effect of the sintering temperature and secondary carbide (VC, Mo2C and TiC) and Mo additions on the NbC grain growth, microstructure evolution as well as concomitant Vickers hardness (HV30) and fracture toughness of Ni-bonded NbC cermets. KW - Cermet KW - Niobium carbide KW - Sintering KW - Microstructure KW - Mechanical properties PY - 2018 DO - https://doi.org/10.1016/j.ijrmhm.2017.12.013 SN - 0263-4368 VL - 72 SP - 63 EP - 70 PB - Elsevier Science CY - Amsterdam AN - OPUS4-43582 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Huang, S. A1 - Vleugels, J. A1 - Cannizza, E. A1 - Woydt, Mathias A1 - Liu, Z. A1 - Mohrbacher, H. T1 - Niobium carbide based cermets with secondary carbide and carbonitride addition N2 - In this study, the influence of Ni binder content and carbide/carbonitride additions on the microstructure and mechanical properties of NbC-Ni matrix cermets were investigated. T2 - WORLDPM2018 CY - Beijing, China DA - 16.09.2018 KW - Cermet KW - Niobium carbide KW - Carbonitride KW - Sintering KW - Mechanical properties PY - 2018 SP - Part 5, 801 EP - 809 AN - OPUS4-46201 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias A1 - Huang, S. A1 - Vleugels, J. A1 - Mohrbacher, H. A1 - Cannizza, E. T1 - Tailoring the functional profile of niobium carbide (NbC) as cutting tool materials and for wear protection N2 - In the present work it was shown that the properties of NbCx, like micro-hardness, hot-hardness, sliding wear resistance, elastic modulus and toughness can be tailored by the C/Nb ratio, the addition of secondary carbides and the type of binder. T2 - WORLDPM2018 CY - Beijing, China DA - 16.09.2018 KW - Niobium carbide KW - Properties KW - Wear KW - Machining PY - 2018 SP - Part 5, 785 EP - 795 AN - OPUS4-46204 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -