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<p>HfC and TiC are high-temperature materials which can be used in astronautic and aeronautic industries. The titanium (Ti) and zirconium (Hf) have the similar chemical properties due to they are in the same IVB family. Zr<sub>x</sub>Hf<sub>1-x</sub>C composites doped with different Hf contents are prepared by pyrolysis of ZrC precursors. The precursor of aqueous solution systems is more environmentally friendly than in organic systems. The results show that prepare high-purity Zr<sub>x</sub>Hf<sub>1-x</sub>C composites can be obtained at the Zr: C and Hf: C molar ratio more than 1: 4. The mole number of C is at least four times than the metal ions Zr<sup>4+</sup> or Hf<sup>4+</sup>. All the prepared composites exist in the form of solid solution. The results show that the average particle size of Zr<sub>x</sub>Hf<sub>1-x</sub>C composite ceramic particles is about 100&#xa0;nm, and the distribution is uniform and dendritic. Zr<sub>0.25</sub>Hf<sub>0.75</sub>C composites can increase the oxidation temperature to 478.6&#xa0;°C, which is a certain increase compared with the initial oxidation temperature of ZrC of 460&#xa0;°C. Meanwhile, the first principles simulation showed that Zr<sub>0.5</sub>Hf<sub>0.5</sub>C has the best mechanical property and thermodynamic properties in Zr<sub>x</sub>Hf<sub>1-x</sub>C system, which can provide a future choice for good mechanical properties of block materials.</p>

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Effect of Hf Content on Microstructure and Properties of ZrxHf1-xC Composites

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Hua Jiao,
  • Qingxiang Wang,
  • Jia Wang,
  • Kang Zhao

摘要

HfC and TiC are high-temperature materials which can be used in astronautic and aeronautic industries. The titanium (Ti) and zirconium (Hf) have the similar chemical properties due to they are in the same IVB family. ZrxHf1-xC composites doped with different Hf contents are prepared by pyrolysis of ZrC precursors. The precursor of aqueous solution systems is more environmentally friendly than in organic systems. The results show that prepare high-purity ZrxHf1-xC composites can be obtained at the Zr: C and Hf: C molar ratio more than 1: 4. The mole number of C is at least four times than the metal ions Zr4+ or Hf4+. All the prepared composites exist in the form of solid solution. The results show that the average particle size of ZrxHf1-xC composite ceramic particles is about 100 nm, and the distribution is uniform and dendritic. Zr0.25Hf0.75C composites can increase the oxidation temperature to 478.6 °C, which is a certain increase compared with the initial oxidation temperature of ZrC of 460 °C. Meanwhile, the first principles simulation showed that Zr0.5Hf0.5C has the best mechanical property and thermodynamic properties in ZrxHf1-xC system, which can provide a future choice for good mechanical properties of block materials.