Oxidation mechanism and kinetics of TiB2 submicron powders in air

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2024-09-23 DOI:10.1111/jace.20135

Xin Li, Jian Tang, Jia Qiao, Bin Chen, Hongfang Shen

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Abstract

High-activity TiB₂ submicron powders were synthesized via microwave-assisted carbothermal reduction, and their oxidation behavior at 550°C–1000°C for 0.5–1.5 h in air atmosphere was carried out by the isothermal oxidation test. The phase composition and microstructure evolution of the oxidation products were performed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). It was established that TiB₂ submicron powders had been significantly oxidized at 550°C, and the oxidation products were TiO₂ and B₂O₃. Hexagonal plate-like TiB₂ grains had been completely disappeared, and fragmented into uniform nano-scale spherical TiO₂ particles after being oxidized at 1000°C for 1 h, accompanied by the violent evaporation of B₂O₃ products at temperatures above 1000°C. In addition, the corresponding oxidation kinetics was investigated by using a non-isothermal thermogravimetric (TG)–differential scanning calorimetry (DSC) technique. The results showed that the Mample power law (n = 1) was the most probable mechanism function, and the oxidation activation energy E of TiB₂ submicron powders was 640.58 kJ/mol.

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TiB2 亚微米粉末在空气中的氧化机理和动力学

通过微波辅助碳热还原法合成了高活性TiB2亚微米粉末，并通过等温氧化试验对其在550°C-1000°C空气环境中0.5-1.5小时的氧化行为进行了研究。通过 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM) 分析了氧化产物的相组成和微观结构演变。结果表明，TiB2 亚微米粉末在 550°C 下发生了显著氧化，氧化产物为 TiO2 和 B2O3。六方板状的 TiB2 晶粒完全消失，在 1000°C 氧化 1 小时后碎裂成均匀的纳米级球形 TiO2 颗粒，在 1000°C 以上的温度下，伴随着 B2O3 产物的剧烈蒸发。此外，还利用非等温热重（TG）-差示扫描量热法（DSC）技术研究了相应的氧化动力学。结果表明，曼普幂律（n = 1）是最可能的机理函数，TiB2 亚微米粉末的氧化活化能 E 为 640.58 kJ/mol。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.