Effect of lanthanum on the structure, properties and high-temperature oxidation patterns of the (Hf,Ta)B2–SiC ceramics

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-10-31 DOI:10.1016/j.jeurceramsoc.2024.117044

A.N. Astapov , A.Yu. Potanin , A.A. Zaitsev , Yu.S. Pogozhev , N.V. Shvyndina , A.N. Tarasova , E.A. Levashov

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引用次数: 0

Abstract

This paper focuses on the kinetics and the mechanism of oxidation (at 1650°C) of the ceramics based on the (Hf_0.8Ta_0.2)B₂, β-SiC and LaF₃ (0 and 3.5 wt%) phases fabricated by a combination of self-propagating high-temperature synthesis (SHS) and hot pressing (HP). The physicomechanical and thermophysical properties of the ceramics were determined. The effect of doping with lanthanum on the kinetics and mechanism of oxidation as well as the structural and morphological features of the resulting oxide layers after efficiency of their protective action was analyzed. The evolutionary changes in the structure were studied: the formation of a three-layered heterogeneous oxide film, modification of borosilicate glass with Hf⁴⁺, Ta⁵⁺ and La³⁺ cations, formation of Hf⁴⁺-doped La_1/3TaO₃ globules followed by their growth via the Ostwald ripening mechanism, generation and oxidation of the secondary TaB₂ phase, significant reduction of the content of the HfSiO₄ phase, etc. Doping the ceramics with lanthanum was shown to exhibit a negative effect on high-temperature oxidation resistance, and the main reasons for that were analyzed.

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镧对(Hf,Ta)B2-SiC 陶瓷结构、性能和高温氧化模式的影响

本文重点研究了以(Hf0.8Ta0.2)B2、β-SiC和LaF3（0和3.5 wt%）相为基础，通过自蔓延高温合成（SHS）和热压（HP）相结合的方法制造的陶瓷（1650°C）的氧化动力学和机理。测定了陶瓷的物理机械性能和热物理性能。分析了掺杂镧对氧化动力学和机理的影响，以及氧化层保护作用效率后的结构和形态特征。研究了结构的演化变化：三层异质氧化膜的形成；Hf4+、Ta5+ 和 La3+ 阳离子对硼硅玻璃的修饰；掺杂 Hf4+ 的 La1/3TaO3 球状的形成及其通过奥斯特瓦尔德熟化机制的生长；次生 TaB2 相的生成和氧化；HfSiO4 相含量的显著降低等。研究表明，在陶瓷中掺入镧会对高温抗氧化性产生负面影响，并分析了其主要原因。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.