Microstructural Evaluation of Ti(C₀.₇N₀.₃)-Mo₂C-xNbC-Ni Cermets

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  • Hosokawa Hiroyuki
    Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology
  • Katou Kiyotaka
    Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology
  • Shimojima Koji
    Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology
  • Furushima Ryoichi
    Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology
  • Matsumoto Akihiro
    Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology

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  • Microstructural Evaluation of Ti(C<sub>0.7</sub>N<sub>0.3</sub>)-Mo<sub>2</sub>C-<i>x</i>NbC-Ni Cermets

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The microstructures of Ti(C0.7N0.3)-19Mo2C-xNbC-24Ni cermets (x = 0, 5, 10, 15, and 20) were studied. The cermets consisted of Ti(C,N) and solid-soluted Ti(C,N) as the hard phase with metallic Ni as a binder phase. The solid-soluted Ti(C,N) was found to surround Ti(C,N) phases, forming core-rim structures in the cermets with low NbC content. Phase separation between the Ti(C,N) and solid-soluted Ti(C,N) occurred in the cermets with higher NbC content. TEM analysis showed solid-soluted Ti(C,N) to nucleate surrouunding Ti(C,N) for 5NbC, but in 20NbC it nucleated within the Ni binder phase. The Nb content in the solid-soluted Ti(C,N) of the composite with 20NbC was higher than that of 5NbC. A hard phase separation occurred when the lattice constant of solid-soluted Ti(C,N) exceeded 4.328 Å.

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