Spark plasma sintering of β-Eucryptite/alumina nanocomposites with low thermal expansion and improved mechanical properties obtained by colloidal route

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-06-26 DOI:10.1016/j.matchar.2025.115335

N. López-Santos , L.A. Díaz , R. Benavente , A. Fernández , M. Suárez

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Abstract

In this study, β-Eucryptite/alumina nanocomposites were synthesized using colloidal methods and sintered by Spark Plasma Sintering (SPS). Nanocomposites with three different alumina contents (2.5, 5 and 10 wt%) were prepared, with pure β-Eucryptite serving as a reference material. The microstructural characteristics of the nanocomposites were analyzed, and their mechanical properties (Young's modulus, hardness, flexural strength, fracture toughness) were evaluated. The incorporation of alumina nanoparticles effectively controlled the grain growth of β-Eucryptite during the sintering process, resulting in a fine-grained structure. Compared to monolithic β-Eucryptite, the nanocomposites exhibited significant enhancements in mechanical performance: hardness increased by at least 25 %, fracture toughness improved by 30 %, and mechanical strength rose by more than 40 %. Furthermore, the composites demonstrated a very low thermal expansion coefficient, making them promising candidates for a wide range of industrial applications.

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火花等离子烧结制备了热膨胀率低、力学性能提高的β-易绿石/氧化铝纳米复合材料

本研究采用胶体法制备了β-易绿石/氧化铝纳米复合材料，并采用放电等离子烧结（SPS）进行烧结。制备了三种不同氧化铝含量（2.5%、5%和10% wt%）的纳米复合材料，以纯β-易绿石为基准物质。分析了纳米复合材料的显微组织特征，并对其力学性能（杨氏模量、硬度、抗弯强度、断裂韧性）进行了评价。在烧结过程中，氧化铝纳米颗粒的掺入有效地控制了β- eucrypite的晶粒生长，形成了细晶结构。与单片β- eucrypite相比，纳米复合材料的力学性能显著提高：硬度提高至少25%，断裂韧性提高30%，机械强度提高40%以上。此外，复合材料表现出非常低的热膨胀系数，使其成为广泛工业应用的有希望的候选者。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.