The Structure and Properties of the Promising Ultra-High-Temperature HfB2–HfC–SiC Ceramics Obtained from Heterophase SHS Powders

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2024-07-01 DOI:10.3103/s1061386224700067

A. A. Zaitsev, Yu. S. Pogozhev, A. Yu. Potanin, A. N. Astapov, I. O. Vakhrusheva, V. V. Korolev, S. I. Rupasov, E. A. Levashov

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Abstract

This work continues the earlier studies focusing on fabrication of heterophase micropowders and consolidated ceramics based on HfB₂–HfC–SiC ultra-high-temperature boride/carbide compositions via self-propagating high-temperature synthesis (SHS) and hot pressing (HP). The effect of NH₄Cl addition on the morphology and microstructure of the SHS powders was studied. Composite micropowders characterized by particle size of 0.2–10 μm and 40–50% content of the submicron-sized fraction were fabricated. The structure, mechanical and thermophysical properties, kinetics and mechanism of high-temperature oxidation of hot-pressed ceramic materials composed of 57–72 wt % HfB₂, 14–20 wt % HfC_x, 10–14 wt % SiC, and 8–15 wt % HfO₂ were studied. They are found to have hardness up to 18.9 GPa, crack resistance up to 9.7 MPa m^0.5, bending strength up to 400 MPa, temperature diffusivity up to 22.6 mm²/s, and thermal conductivity up to 59 W/(m K). The power law describes their oxidation kinetics. The protection mechanism against oxidation involves the formation of a multilayered heterogenous oxide film consisting of HfO₂, HfSiO₄, and borosilicate glass.

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利用异相 SHS 粉末制备的前景广阔的超高温 HfB2-HfC-SiC 陶瓷的结构与性能

摘要这项工作延续了先前的研究，重点是通过自蔓延高温合成（SHS）和热压（HP）法制备基于 HfB2-HfC-SiC 超高温硼化物/碳化物组合物的异相微粉和固结陶瓷。研究了 NH4Cl 添加量对 SHS 粉末形貌和微观结构的影响。制备出的复合微粉的粒度为 0.2-10 μm，亚微米级部分的含量为 40-50%。研究了由 57-72 wt % HfB2、14-20 wt % HfCx、10-14 wt % SiC 和 8-15 wt % HfO2 组成的热压陶瓷材料的结构、机械和热物理性能、高温氧化动力学和机理。研究发现，它们的硬度高达 18.9 GPa，抗裂性高达 9.7 MPa m0.5，抗弯强度高达 400 MPa，温度扩散率高达 22.6 mm2/s，热导率高达 59 W/（m K）。幂律描述了它们的氧化动力学。氧化保护机制包括形成一层由 HfO2、HfSiO4 和硼硅玻璃组成的多层异质氧化膜。

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来源期刊

International Journal of Self-Propagating High-Temperature Synthesis MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

33.30%

发文量

期刊介绍： International Journal of Self-Propagating High-Temperature Synthesis is an international journal covering a wide range of topics concerned with self-propagating high-temperature synthesis (SHS), the process for the production of advanced materials based on solid-state combustion utilizing internally generated chemical energy. Subjects range from the fundamentals of SHS processes, chemistry and technology of SHS products and advanced materials to problems concerned with related fields, such as the kinetics and thermodynamics of high-temperature chemical reactions, combustion theory, macroscopic kinetics of nonisothermic processes, etc. The journal is intended to provide a wide-ranging exchange of research results and a better understanding of developmental and innovative trends in SHS science and applications.