Combustion Synthesis and Characterization of Ultra-High-Temperature NbB2–HfB2 Solid Solutions

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2024-01-18 DOI:10.3103/s1061386223040143

V. V. Kurbatkina, E. I. Patsera, T. A. Sviridova, N. A. Kochetov, E. A. Levashov

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Abstract

This paper presents an in-depth study on the combustion synthesis, solid-solution formation, processing, and characterization of NbB₂–HfB₂ ceramics, aiming to explore their potential applications, particularly in industries requiring high-performance materials. We conducted macrokinetic measurements and fitted regression models to predict combustion temperature and velocity for compositions ranging from 50 to 100% HfB₂. A combined method of ball milling and hot pressing was developed for processing the combustion products into dense ceramics. These methods resulted in samples with relative densities reaching 97%, hardness of up to 34 GPa, and Young’s modulus of up to 530 GPa, with NbB₂–50% HfB₂ solid solution exhibiting the best mechanical properties. The study revealed a linear increase in thermal properties and density with the rise in HfB₂ content. The thermal conductivity of the solid solutions in the Nb–Hf–B system ranged from 34 to 40 W/mK and was found to increase with temperature, making these ceramics suitable for ultra-high-temperature applications. The findings have significant implications for aerospace and high-performance engineering sectors and provide a solid foundation for further investigation of Nb–Hf–B ceramics under real-world operational conditions.

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超高温 NbB2-HfB2 固溶体的燃烧合成与表征

摘要本文对 NbB2-HfB2 陶瓷的燃烧合成、固溶形成、加工和表征进行了深入研究，旨在探索其潜在应用，特别是在需要高性能材料的行业中。我们进行了宏观动力学测量，并拟合了回归模型，以预测 50% 到 100% HfB2 成分的燃烧温度和速度。我们开发了一种球磨和热压相结合的方法，用于将燃烧产物加工成致密陶瓷。这些方法使样品的相对密度达到 97%，硬度高达 34 GPa，杨氏模量高达 530 GPa，其中 NbB2-50% HfB2 固溶体表现出最佳的机械性能。研究表明，随着 HfB2 含量的增加，热性能和密度也呈线性增长。Nb-Hf-B 系统中固溶体的热导率在 34 到 40 W/mK 之间，并且随着温度的升高而增加，这使得这些陶瓷适用于超高温应用。这些发现对航空航天和高性能工程领域具有重要意义，并为在实际操作条件下进一步研究 Nb-Hf-B 陶瓷奠定了坚实的基础。

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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.