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Effects of TiB2 Content on the Microstructures and Mechanical Properties of Low-Cobalt Ti(C,N)-TiB2 Cermets Fabricated by Vacuum Hot Pressing

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Abstract

Ti(C,N)-TiB2 cermets were fabricated from Ti(C,N), TiB2, Co and WC powder mixtures via a vacuum hot pressing process. The influence of TiB2 content on their microstructures and mechanical properties was investigated. As a result of the elevated TiB2 contents, two types of core-rim microstructures were present in the Ti(C,N)-TiB2 cermets, and remarkably improved mechanical properties were achieved. With the increase of TiB2 content, the flexural strength, fracture toughness and hardness of the Ti(C,N)-TiB2 cermets first increased, and then decreased, while their relative density consistently decreased. Attributed to an integration of the intergranular and intrangranular fracture behaviors, the Ti(C,N)-TiB2 cermets with 20 wt% TiB2 content exhibited the best overall properties with the relative density, hardness, fracture toughness and flexural strength at 99.3%, 1 995 H V, 7.92 MPa·m1/2 and 1 114 MPa, respectively. The underlying mechanism for their enhanced properties was studied in detail.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Nanchang University, Nanchang, 330031, China

    Yihang Fang  (方一航), Wenyi Peng, Nan Chen & Guoping Du  (杜国平)

  2. Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, 318000, China

    Yihang Fang  (方一航), Mengxian Zhang, Xianrui Zhao & Shangshen Feng

Authors
  1. Yihang Fang  (方一航)
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  2. Mengxian Zhang
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  3. Xianrui Zhao
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  4. Shangshen Feng
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  5. Wenyi Peng
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  6. Nan Chen
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  7. Guoping Du  (杜国平)
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Corresponding author

Correspondence to Guoping Du  (杜国平).

Additional information

Funded by the National Natural Science Foundation of China (Nos. 21571095, 51404157), the Zhejiang Provincial Natural Science Foundation of China (No. LY17E050003), the Taizhou Science and Technology Project (No. 15gy54), the Open Research Program of Zhejiang Provincial Key Laboratory for Cutting Tools (No. ZD201501), the Open Foundation of Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology and the Public Projects of Zhejiang Province (Nos. 2017C31118, 2016C31049)

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Fang, Y., Zhang, M., Zhao, X. et al. Effects of TiB2 Content on the Microstructures and Mechanical Properties of Low-Cobalt Ti(C,N)-TiB2 Cermets Fabricated by Vacuum Hot Pressing. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 34, 1077–1084 (2019). https://doi.org/10.1007/s11595-019-2162-3

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  • DOI: https://doi.org/10.1007/s11595-019-2162-3

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