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Abstract <p>The formation of superhard ceramic-matrix composites of the BL group in the cBN–TiC–ZrN–Me (Me = Co, Hf, W) systems was investigated. The materials were synthesized by HPHT sintering (<i>p</i> = 7.7 GPa, <i>T</i> = 1800 and 2300°C) of mixtures with a composition of (vol %) 60 : 15 : 15 : 10. Before sintering, the TiC–ZrN–Me component was subjected to mechanochemical activation in a planetary mill. Under high-pressure and high-temperature conditions, reaction interactions between TiC, ZrN, and Me lead to the formation of multicomponent solid solutions (Ti,Zr,Me)(C,N) with an NaCl-type structure, the composition of which corresponds to that of the initial filler mixture. The resulting ceramics exhibit a homogeneous grain microstructure with well-defined interphase boundaries, a hardness <i>HV</i>50 of 33–35 GPa, and a high Young’s modulus of 620–670 GPa. Cutting inserts produced from these materials are suitable for machining hardened steels.</p>

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Sintering of BL Group Ceramic-Matrix Composites in cBN–TiC–ZrN–Me Systems (Me–Co, Hf, W)

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • D. A. Stratiichuk,
  • N. M. Belyavina,
  • V. Z. Turkevich,
  • S. P. Starik,
  • Ya. M. Romanenko

摘要

Abstract

The formation of superhard ceramic-matrix composites of the BL group in the cBN–TiC–ZrN–Me (Me = Co, Hf, W) systems was investigated. The materials were synthesized by HPHT sintering (p = 7.7 GPa, T = 1800 and 2300°C) of mixtures with a composition of (vol %) 60 : 15 : 15 : 10. Before sintering, the TiC–ZrN–Me component was subjected to mechanochemical activation in a planetary mill. Under high-pressure and high-temperature conditions, reaction interactions between TiC, ZrN, and Me lead to the formation of multicomponent solid solutions (Ti,Zr,Me)(C,N) with an NaCl-type structure, the composition of which corresponds to that of the initial filler mixture. The resulting ceramics exhibit a homogeneous grain microstructure with well-defined interphase boundaries, a hardness HV50 of 33–35 GPa, and a high Young’s modulus of 620–670 GPa. Cutting inserts produced from these materials are suitable for machining hardened steels.