分层多孔硼酸铝晶须基陶瓷通过冷冻凝胶铸造和原位反应

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International Pub Date : 2025-04-01 DOI:10.1016/j.pnsc.2024.12.016

Jianqiang Xin , Xinger Liu , Chong He , Wenbin Li , Yuheng Zhang , Ze Wu , Anran Guo

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引用次数: 0

摘要

多孔硼酸铝陶瓷是高温隔热应用的理想候选者。采用冷冻凝胶铸造和原位反应相结合的方法，制备了具有分层孔结构的轻质高强保温硼酸铝晶须基多孔陶瓷。研究了硼铝比对硼酸铝晶须形貌的影响以及琼脂添加量对硼酸铝晶须多孔陶瓷孔隙结构和性能的影响。硼酸铝晶须基多孔陶瓷具有典型的分层孔隙结构，包括冻结铸造过程中冰晶生长形成的宏观孔隙和B4C与Al2O3原位反应生成的重叠硼酸铝晶须在孔壁上形成的微观孔隙。结果表明，当B/Al摩尔比为6:9，琼脂添加量为0.4 g时，制备的硼酸铝晶须基多孔陶瓷具有低密度（0.20 g/cm3）、高孔隙率（93.5%）、高抗压强度（4.09 MPa）和低导热系数（0.072 W/(m·K)）的特点，是一种很有前途的高温保温结构材料。

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Hierarchically porous aluminum borate whisker-based ceramics via freeze-gel casting and in situ reaction

Porous aluminum borate ceramics are ideal candidates for high-temperature thermal insulation applications. In this work, lightweight, high strength and thermal insulating aluminum borate whisker-based porous ceramics with hierarchical pore structure were fabricated by the combination of freeze-gel casting and in situ reaction. The effects of B/Al ratio on the morphology of aluminum borate whiskers and the addition amount of agar on the pore structure and properties of aluminum borate whisker-based porous ceramics were investigated. The aluminum borate whisker-based porous ceramics exhibited a typical hierarchical pore structure, including macro pores formed by the growth of ice crystal in the freeze casting process and micro pores in pore walls formed by the overlapped aluminum borate whiskers generated from the in situ reaction of B₄C and Al₂O₃. Results shows when the B/Al molar ratio was 6:9 and the addition amount of agar was 0.4 g, the resultant aluminum borate whisker-based porous ceramics shows a low density (0.20 g/cm³), high porosity (93.5 %), high compressive strength (4.09 MPa) and low thermal conductivity (0.072 W/(m·K)), which can be regarded as a promising high temperature thermal insulation structural material.

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来源期刊

Progress in Natural Science: Materials International 综合性期刊-综合性期刊

CiteScore

8.60

自引率

2.10%

发文量

2812

审稿时长

49 days

期刊介绍： Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.