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<p>In this study, (Ti,W,Mo,Nb,Ta)(C,N)-7.5 wt.%Co-7.5 wt.%Ni composite powders were synthesized via carbothermal co-reduction nitridation method. The (Ti,W,Mo,Nb,Ta)(C,N)-Co-Ni precursor gels were prepared via sol-gel technology. The phase compositions and microstructures of two Ti(C,N)-based cermet powders were analyzed in comparison with the non-co-reduced powders. Results showed that (Ti,W,Mo,Nb,Ta)(C, N)-Co-Ni composite powders synthesized in N<sub>2</sub> atmosphere for 2 h under a pressure of 2&#xa0;kPa at 1550&#xa0;°C exhibited the uniform distribution of Co and Ni elements and the low free C contents. Compared with (Ti, W, Mo, Nb, Ta)(C, N) ceramic powders produced through the carbothermal reduction nitridation, the particle size of co-reduced powders decreased by approximately 100&#xa0;nm. The most optimal mechanical properties were achieved in (Ti, W, Mo, Nb, Ta)(C, N)-Co-Ni cermets prepared by 2-h vacuum sintering at 1500&#xa0;°C. In particular, the corresponding HV<sub>30</sub>(Vickers-hardness),TRS(Transverse rupture strength) and K<sub>IC</sub>(Indentation fracture toughness) values were 1827&#xa0;MPa, 1598&#xa0;MPa and 9.41&#xa0;MPa&#xa0;m<sup>1/2</sup>, respectively, being 5.5, 4.3 and 4.4% higher than those of cermets obtained from the non-co-reduced powders. Grain refinement, crack deflection and microcracks were found to be the main reasons for the improvement of hardness, strength and fracture toughness of the above cermets.</p>

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Synthesis of (Ti,Me)(C,N)-Co-Ni Composite Powders Produced via Polycompound Co-reduction and Properties of Their Cermets

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Xin Tao,
  • Houan Zhang,
  • Siyong Gu,
  • Dongxu Qiao,
  • Peng Xia,
  • Yunhao Zhang,
  • Wei Dang,
  • Xiao Wen

摘要

In this study, (Ti,W,Mo,Nb,Ta)(C,N)-7.5 wt.%Co-7.5 wt.%Ni composite powders were synthesized via carbothermal co-reduction nitridation method. The (Ti,W,Mo,Nb,Ta)(C,N)-Co-Ni precursor gels were prepared via sol-gel technology. The phase compositions and microstructures of two Ti(C,N)-based cermet powders were analyzed in comparison with the non-co-reduced powders. Results showed that (Ti,W,Mo,Nb,Ta)(C, N)-Co-Ni composite powders synthesized in N2 atmosphere for 2 h under a pressure of 2 kPa at 1550 °C exhibited the uniform distribution of Co and Ni elements and the low free C contents. Compared with (Ti, W, Mo, Nb, Ta)(C, N) ceramic powders produced through the carbothermal reduction nitridation, the particle size of co-reduced powders decreased by approximately 100 nm. The most optimal mechanical properties were achieved in (Ti, W, Mo, Nb, Ta)(C, N)-Co-Ni cermets prepared by 2-h vacuum sintering at 1500 °C. In particular, the corresponding HV30(Vickers-hardness),TRS(Transverse rupture strength) and KIC(Indentation fracture toughness) values were 1827 MPa, 1598 MPa and 9.41 MPa m1/2, respectively, being 5.5, 4.3 and 4.4% higher than those of cermets obtained from the non-co-reduced powders. Grain refinement, crack deflection and microcracks were found to be the main reasons for the improvement of hardness, strength and fracture toughness of the above cermets.