Microstructure evolution and tribological properties of TiB2/Ni–Ta cermets |
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| Authors: | Ľuboš Bača Zoltán Lenčéš Christian Jogl Erich Neubauer Martin Vitkovič Andreas Merstallinger Pavol Šajgalík |
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| Affiliation: | 1. Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC;2. Department of Bioinformatics and Medical Engineering, Asia University, Taichung 41354, Taiwan, ROC;3. 3D Printing Medical Research Institute, Asia University, Taichung 41354, Taiwan, ROC;4. Casting Technology Section, Metal Processing R&D Department, Metal Industries Research & Development Centre, Kaohsiung 81160, Taiwan, ROC;5. 3D Printing Medical Research Center, China Medical University Hospital, Taichung 40447, Taiwan, ROC;6. Institute for Advanced Study, Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong |
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| Abstract: | Cermets containing TiB2 and single or mixed metals were produced by conventional hot-pressing technique at 2100 °C for 1 h. Nickel, tantalum and their mixtures were used as alloying substances to enhance the density of TiB2 composites. The influence of metal addition on the microstructure and tribological properties were investigated. The addition of Ta powder greatly refined the microstructure of sintered samples. Similarly, the mixture of Ni and Ta metals hindered the grain growth of TiB2 particles during the hot-pressing while the samples were sintered up to 98% of theoretical density. The wear behaviour of the composites was assessed by ball on disk tests. The wear rate against alumina counterbody varied in the range of (5.9–21.2) × 10?6 mm3/Nm. The friction coefficient was not affected significantly by the alloying substances and only slightly increased from 0.58 for pure TiB2 to 0.67 for samples with Ta addition. |
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