Densification mechanism and corrosion properties of h-BN/MgAl2O4 ceramics prepared by hot-pressed sintering

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-09-30 DOI:10.1016/j.ceramint.2024.09.424

Yongshun Qi , Fan Zhang , Bingbing Fan , Xiaolu Li , Mao Chen , Rui Zhang , Hongxia Li , Yongqiang Chen

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Abstract

The dense h-BN/MgAl₂O₄ composites without additives were fabricated by hot-pressed sintering. The effect of sintering temperature and MgAl₂O₄ on the bulk density, mechanical properties and corrosion resistance were systematically investigated. The results showed that the collaboration of sintering temperature and MgAl₂O₄ dominated the densification behavior due to the enhanced pore filling effects and solid diffusion. The improved densification and induced microstructure development contributed to enhanced mechanical properties. Additionally, the residual MgAl₂O₄ is more conducive to forming plate-like complex oxide with molten steel after BN oxidation and B₂O₃ volatilization. Consequently, the plate-like complex oxide can effectively hinder direct contact between molten steel and the composite, which determines the corrosion resistance of the h-BN/MgAl₂O₄ composite. This study highlights the enormous potential of h-BN/MgAl₂O₄ composites for future use as side-sealing materials.

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热压烧结法制备的 h-BN/MgAl2O4 陶瓷的致密化机制和腐蚀特性

通过热压烧结法制备了不含添加剂的高密度 h-BN/MgAl2O4 复合材料。系统研究了烧结温度和 MgAl2O4 对体积密度、力学性能和耐腐蚀性能的影响。结果表明，由于孔隙填充效应和固体扩散作用的增强，烧结温度和 MgAl2O4 的协同作用主导了致密化行为。改善的致密化和诱导的微结构发展有助于提高机械性能。此外，在 BN 氧化和 B2O3 挥发后，残留的 MgAl2O4 更有利于与钢水形成板状复合氧化物。因此，板状复合氧化物能有效阻碍钢水与复合材料的直接接触，从而决定了 h-BN/MgAl2O4 复合材料的耐腐蚀性。这项研究凸显了 h-BN/MgAl2O4 复合材料在未来用作侧密封材料方面的巨大潜力。

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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.