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New TiC/Co1.5CrFeNi1.5Ti0.5 Cermet with Slow TiC Coarsening During Sintering

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Abstract

New TiC/Co1.5CrFeNi1.5Ti0.5 cermet was developed by exploiting the advantages of the high-entropy alloy (HEA) binder. A much finer grain structure and thus improved hardness–toughness combination were obtained as compared with two traditional binders, Ni and Ni13Mo7. From the coarsening behavior of TiC grains, the coarsening process of TiC in these three binders is diffusion-controlled. The activation energy of TiC + 20%Co1.5CrFeNi1.5Ti0.5 is the highest and that of TiC + 20%Ni is the lowest. The high activation energy of the Co1.5CrFeNi1.5Ti0.5 binder was attributable to its high content of carbon-strong-binding elements, Cr and Ti, and cooperative diffusion and higher packing density of multiple different-sized atoms. Low diffusion coefficient, low surface energy of TiC grains, and low solubility of Ti in the HEA liquid explain the slow coarsening of TiC grains. This study demonstrates that Co1.5CrFeNi1.5Ti0.5 is an excellent HEA binder for TiC cermets.

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Acknowledgements

The authors are pleased to acknowledge the financial support for this research by the Ministry of Science and Technology of Taiwan under Grant No. MOST 103-2218-E-007-011.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan

    Chun-Ming Lin, Che-Wei Tsai, Sheng-Min Huang & Jien-Wei Yeh

  2. Green Energy & Eco-Technology System Center, ITRI South Campus, Industrial Technology Research Institute, Tainan, 70955, Taiwan

    Chih-Chao Yang

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  1. Chun-Ming Lin
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Correspondence to Jien-Wei Yeh.

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Lin, CM., Tsai, CW., Huang, SM. et al. New TiC/Co1.5CrFeNi1.5Ti0.5 Cermet with Slow TiC Coarsening During Sintering. JOM 66, 2050–2056 (2014). https://doi.org/10.1007/s11837-014-1095-8

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  • DOI: https://doi.org/10.1007/s11837-014-1095-8

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