冷冻铸造-压力浸渗制备仿贝壳层状结构Al/Al<sub>2</sub>O<sub>3</sub>复合材料及其性能研究

doi:10.19976/j.cnki.43-1448/TF.2024096

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Abstract Drawing inspiration from the high performance of natural materials such as nacres, which derive their advantages from a unique lamellar structure, and combined with the concept of bionics. This study prepared Al/Al₂O₃ composites with a nacre-inspired lamellar structure using freeze casting and pressure infiltration. The effects of basalt sintering aids and sintering temperature on the microstructure and compressive strength of the porous Al₂O₃ framework were studied by scanning electron microscope and material testing machine, and the microstructure and phase volume fraction of the composites were observed and analyzed by micro-CT. The results show that the porous Al₂O₃ framework has a lamellar structure with alternating arrangement of pores and ceramics. The formation mechanism of this structure is attributed to the directional growth of ice crystals, during the growth process, the ice crystals push the ceramic particles to the sides to form the directional lamellar structure. The addition of basalt sintering aids or an increase in sintering temperature can significantly enhance volume shrinkage and compressive strength of ceramic framework. Chemical bonding is established at the Al/Al₂O₃ interface, which enables the melt and skeleton to be effectively composited. Al/Al₂O₃ composites feature high densification and show a delicate lamellar structure, largely achieving the design goal of the nacre-inspired structure.

Key words： freeze casting vacuum-pressure infiltration bioinspired structure design lamellar structure metal/ceramic composite

Received: 29 October 2024 Published: 08 April 2025

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	YANG Likai
	LÜ Boliang
	CEN Junchi
	LIN Qiaoli
	SHI Yu

Cite this article:

YANG Likai,LÜ Boliang,CEN Junchi, et al. Preparation and properties study of nacre-inspired lamellar Al/Al₂O₃ composites by freeze casting and pressure infiltration[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(1): 71-78.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2024096 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I1/71

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