Archives of Metallurgy and Materials

Institute of Metallurgy and Materials Science of Polish Academy of Sciences
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Consolidation and Oxidation of Ultra Fine WC-Co-HfB2 Hard Materials by Spark Plasma Sintering

  • Hyun-Kuk-Park (Korea Institute of Industrial Technology, Smart Mobility Materials and Components R&D Group) ;
  • Ik-Hyun-Oh (Korea Institute of Industrial Technology, Smart Mobility Materials and Components R&D Group) ;
  • Ju-Hun-Kim (Korea Institute of Industrial Technology, Smart Mobility Materials and Components R&D Group) ;
  • Sung-Kil-Hong (Chonnam National University, Materials Science & Engineering) ;
  • Jeong-Han Lee (Korea Institute of Industrial Technology, Smart Mobility Materials and Components R&D Group)
  • Published : 20210000
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Abstract

In this study, a novel composite was fabricated by adding the Hafnium diboride (HfB2) to conventional WC-Co cemented carbides to enhance the high-temperature properties while retaining the intrinsic high hardness. Using spark plasma sintering, high density (up to 99.4%) WC-6Co-(1, 2.5, 4, and 5.5 wt. %) HfB2 composites were consolidated at 1300℃ (100℃/min) under 60 MPa pressure. The microstructural evolution, oxidation layer, and phase constitution of WC-Co-HfB2 were investigated in the distribution of WC grain and solid solution phases by X-ray diffraction and FE-SEM. The WC-Co-HfB2 composite exhibited improved mechanical properties (approximately 2,180.7 kg/mm2) than those of conventional WC-Co cemented carbides. The high strength of the fabricated composites was caused by the fine-grade HfB2 precipitate and the solid solution, which enabled the tailoring of mechanical properties.

Keywords

Acknowledgement

This study has been conducted with the support of the Korea Institute of Industrial Technology (KITECH), Production Industry Leading Core Technology Development Project as the "Development of an on-site facility attached cryogenic machining integrated system (KITECH EH-21-0010)".