Strategies to improve oxidation resistance of MgO–C refractories by decreasing oxygen potential through MgSiN2

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

Journal of the American Ceramic Society Pub Date : 2024-09-13 DOI:10.1111/jace.20114

Fanqiang Meng, Yixin Luo, Zhenglong Liu, Chao Yu, Chengji Deng, Jun Ding

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引用次数: 0

Abstract

MgO–C refractories are of paramount importance in the converter side blowing system, requiring outstanding oxidation resistance under harsh conditions including high temperature, oxygen atmosphere, and high-speed airflow. In this study, MgSiN₂ phase reconstruction was used to improve the oxidation resistance of MgO–C refractories, as well as the mechanical properties and oxidation resistance of MgO–C refractories were evaluated. The results indicated that the cold modulus of rupture of the sample with 9 wt% MgSiN₂ was increased by 93.3% compared with the MgO–C refractories without MgSiN₂. After oxidation tests, the oxidation index and rate constant (k) of the sample with 9 wt% MgSiN₂ were reduced by 38.9% and 35.3%. Furthermore, incorporating MgSiN₂ facilitated the formation of layered dense structures consisting of plate-like Mg-Sialon and MgO–Mg₂SiO₄–MgAl₂O₄. This structural optimization effectively inhibited oxygen diffusion and reaction within the material, resulting in gradual oxygen potential mitigation.

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通过 MgSiN2 降低氧势以提高 MgO-C 耐火材料抗氧化性的策略

氧化镁-碳耐火材料在转炉侧吹灰系统中至关重要，需要在高温、氧气环境和高速气流等恶劣条件下具有出色的抗氧化性。本研究采用 MgSiN2 相重构来提高 MgO-C 耐火材料的抗氧化性，并对 MgO-C 耐火材料的机械性能和抗氧化性进行了评估。结果表明，与不含 MgSiN2 的 MgO-C 耐火材料相比，含 9 wt% MgSiN2 的样品的冷断裂模量提高了 93.3%。经过氧化测试，含有 9 wt% MgSiN2 的样品的氧化指数和速率常数（k）分别降低了 38.9% 和 35.3%。此外，MgSiN2 的加入还促进了由板状 Mg-Sialon 和 MgO-Mg2SiO4-MgAl2O4 组成的层状致密结构的形成。这种结构优化有效地抑制了材料内部的氧扩散和反应，从而逐步降低了氧电势。

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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.