Oxidation behavior of Al2O3-SiC-C castable with highly wettable SiC@C composites

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-09-23 DOI:10.1016/j.ceramint.2024.09.302

Chaofan Yin , Junrui Yang , Jianjun Chen , Li Wang , Binbin Dong , Keke Zhang , Kai Peng , Xiangcheng Li

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Abstract

Graphite-based composite materials have emerged as a crucial alternative to traditional flake graphite for optimizing the performance of Al₂O₃-SiC-C (ASC) castables after decarburization. In this paper, high wetting SiC@C composites powder was prepared via a sol-gel method combined with a carbothermal reduction reaction, and its effect on the oxidation behavior of ASC castables is explored. The results showed that SiC@C composites was synthesized under microwave conditions at 1000 °C, forming a structure where SiC whiskers are coated. And its contact angle with water decreases from 107° to 35°. Upon incorporation into ASC castables, the SiC whiskers within the sample continued to grow and develop with increasing addition of graphite-based composite materials. At a 2 wt% addition, the SiC whiskers began to form a cylindrical structure. Simultaneously, both the cold crushing strength and cold modulus of rupture exhibited a gradual increase. At the optimal 2 wt% addition, these values reached their maximum, 79.5 MPa and 11.4 MPa, respectively. The substitution of graphite-based composite materials also conferred good oxidation resistance to the ASC samples. Under oxidizing atmosphere conditions, the SiC whiskers on the composite material's surface facilitated the formation of a SiO₂ coating layer, which impeded the contact between oxygen and graphite, thereby enhancing the oxidation resistance of the material. Consequently, the oxidation index was reduced from 75.58 % to 42.71 %.

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Al2O3-SiC-C 浇注料与高润湿性 SiC@C 复合材料的氧化行为

石墨基复合材料已成为传统鳞片石墨的重要替代品，可优化脱碳后的 Al2O3-SiC-C (ASC) 浇注料的性能。本文通过溶胶-凝胶法结合碳热还原反应制备了高润湿性 SiC@C 复合材料粉末，并探讨了其对 ASC 浇注料氧化行为的影响。结果表明，SiC@C 复合材料是在 1000 ℃ 的微波条件下合成的，形成了 SiC 晶须包覆的结构。其与水的接触角从 107°降至 35°。加入 ASC 浇注料后，随着石墨基复合材料添加量的增加，样品中的 SiC 晶须不断生长和发展。添加量为 2 wt% 时，SiC 晶须开始形成圆柱形结构。与此同时，冷压强度和冷断裂模量也逐渐增加。在最佳添加量为 2 wt% 时，这些值达到最大值，分别为 79.5 兆帕和 11.4 兆帕。石墨基复合材料的替代还赋予了 ASC 样品良好的抗氧化性。在氧化气氛条件下，复合材料表面的碳化硅晶须促进了二氧化硅涂层的形成，阻碍了氧气与石墨之间的接触，从而增强了材料的抗氧化性。因此，氧化指数从 75.58 % 降至 42.71 %。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.