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<p>In this study (Zr1-2 × Hfx Tix) B2 ultra-high temperature ceramic (UHTCs) matrix composites were fabricated and reinforced with various additives (SiC, Si-Gr, Si-CNT) through spark plasma sintering (SPS) at 2000&#xa0;°C, 40&#xa0;MPa, for 10&#xa0;min. The research investigates the impact of different reinforcement types on densification behavior, microstructure, and solid solution formation. Relative density measurements were conducted using the Archimedes method, while microstructural analysis and phase identification were performed using FE-SEM and XRD respectively. The findings revealed that the highest level of densification was achieved in (Zr1-2 × Hfx Tix) B2 samples reinforced with Si–C and Si-CNT, with relative densities of 98.2% and 95.8%, respectively, while the lowest densification was observed in the SiC-reinforced sample, denoted as HZTSiC. XRD analysis indicated the formation of new peaks distinct from the initial powders, corresponding to B<sub>4</sub>Si, HfSiO4, TiB<sub>2</sub> and solid solution phases. It was observed that Ti and Hf diffused and dissolved into the ZrB2 lattices, resulting in the formation of (Zr1-2 × Hfx Tix) B2 solid solutions. The lowest level of oxide impurity (3.7 wt%) and the highest proportion of solid solution phases (88.7 wt%) were observed in (Zr1-2 × Hfx Tix) B2 containing Si-Gr.</p> Graphical Abstract <p></p>

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Impact of different additives on the microstructure and relative density of (Zr1-2xHfxTix)B2 solid solution

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Abbas Jahanbakhsh,
  • Zohre Balak,
  • Hosein Kafashan,
  • Mahdi Azizieh

摘要

In this study (Zr1-2 × Hfx Tix) B2 ultra-high temperature ceramic (UHTCs) matrix composites were fabricated and reinforced with various additives (SiC, Si-Gr, Si-CNT) through spark plasma sintering (SPS) at 2000 °C, 40 MPa, for 10 min. The research investigates the impact of different reinforcement types on densification behavior, microstructure, and solid solution formation. Relative density measurements were conducted using the Archimedes method, while microstructural analysis and phase identification were performed using FE-SEM and XRD respectively. The findings revealed that the highest level of densification was achieved in (Zr1-2 × Hfx Tix) B2 samples reinforced with Si–C and Si-CNT, with relative densities of 98.2% and 95.8%, respectively, while the lowest densification was observed in the SiC-reinforced sample, denoted as HZTSiC. XRD analysis indicated the formation of new peaks distinct from the initial powders, corresponding to B4Si, HfSiO4, TiB2 and solid solution phases. It was observed that Ti and Hf diffused and dissolved into the ZrB2 lattices, resulting in the formation of (Zr1-2 × Hfx Tix) B2 solid solutions. The lowest level of oxide impurity (3.7 wt%) and the highest proportion of solid solution phases (88.7 wt%) were observed in (Zr1-2 × Hfx Tix) B2 containing Si-Gr.

Graphical Abstract