Preparation and Structural Evolution of ZrB 2 –HfC–SiC/Dicyanobenzene Hybrid Ultra-High-Temperature Materials Moulded at 250 °C/2 h.
Saved in:
| Title: | Preparation and Structural Evolution of ZrB 2 –HfC–SiC/Dicyanobenzene Hybrid Ultra-High-Temperature Materials Moulded at 250 °C/2 h. |
|---|---|
| Authors: | Wang, Jiayi1 (AUTHOR), Zhu, Xiumao1,2 (AUTHOR), Mu, Xueliang1 (AUTHOR) xueliang.mu@dlut.edu.cn, Wang, Bingzhu2 (AUTHOR) |
| Source: | Materials (1996-1944). Jul2026, Vol. 19 Issue 13, p2783. 13p. |
| Subjects: | Hafnium compounds, Zirconium boride, Thermal conductivity, Silicon carbide, Heat resistant materials, Mechanical behavior of materials, Organic compounds |
| Abstract: | Highlights: Hafnium carbide and other ceramic powders bonded with phthalonitrile at 250 °C transform into ultra-high-temperature materials capable of withstanding ablation of 0.156 μm/s at 2600 °C 480 s. The evolution patterns of internal temperature and chemical structure of the as-prepared ultra-high-temperature ceramics during ablation are inferred. This work investigates the variations in ablation performance, mechanical properties, and thermal conductivity of the target ultra-high-temperature ceramics during the ablation process. Ultra-high-temperature materials (UHMs) are indispensable for extreme thermal environments (e.g., temperatures exceeding 2000 °C); however, their practical implementation remains severely constrained by demanding processing conditions, including extreme sintering temperatures, prolonged cycles, densification barriers and high equipment cost. In order to meet the low-cost and ablation-resistant requirements of aircraft nose cones, a facile organic–inorganic hybrid strategy is proposed to fabricate ZrB2–HfC–SiC composites using a high-char-yield 1,2-dicyanobenzene (DCB) binder, enabling low-temperature moulding at merely 250 °C (2 h; 20 MPa). Upon high-temperature oxidative exposure, the DCB matrix undergoes in situ pyrolysis and synergistic co-sintering with the ceramic powders, producing a multi-layered, self-protective structural architecture. A comprehensive structure–temperature map correlating temperature-dependent phase evolution with flexural strength and thermal conductivity is established, thereby elucidating the underlying self-healing and ablation-resistance mechanisms. The hybrid material in this work exhibits excellent flexural strength, ablation resistance and thermal stability. This study successfully reconciles the long-standing contradiction between low-temperature processability and ultra-high-temperature (2600 °C) service durability, offering a scalable route for next-generation thermal protection systems. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | Highlights: Hafnium carbide and other ceramic powders bonded with phthalonitrile at 250 °C transform into ultra-high-temperature materials capable of withstanding ablation of 0.156 μm/s at 2600 °C 480 s. The evolution patterns of internal temperature and chemical structure of the as-prepared ultra-high-temperature ceramics during ablation are inferred. This work investigates the variations in ablation performance, mechanical properties, and thermal conductivity of the target ultra-high-temperature ceramics during the ablation process. Ultra-high-temperature materials (UHMs) are indispensable for extreme thermal environments (e.g., temperatures exceeding 2000 °C); however, their practical implementation remains severely constrained by demanding processing conditions, including extreme sintering temperatures, prolonged cycles, densification barriers and high equipment cost. In order to meet the low-cost and ablation-resistant requirements of aircraft nose cones, a facile organic–inorganic hybrid strategy is proposed to fabricate ZrB2–HfC–SiC composites using a high-char-yield 1,2-dicyanobenzene (DCB) binder, enabling low-temperature moulding at merely 250 °C (2 h; 20 MPa). Upon high-temperature oxidative exposure, the DCB matrix undergoes in situ pyrolysis and synergistic co-sintering with the ceramic powders, producing a multi-layered, self-protective structural architecture. A comprehensive structure–temperature map correlating temperature-dependent phase evolution with flexural strength and thermal conductivity is established, thereby elucidating the underlying self-healing and ablation-resistance mechanisms. The hybrid material in this work exhibits excellent flexural strength, ablation resistance and thermal stability. This study successfully reconciles the long-standing contradiction between low-temperature processability and ultra-high-temperature (2600 °C) service durability, offering a scalable route for next-generation thermal protection systems. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 19961944 |
| DOI: | 10.3390/ma19132783 |
