Preparation and forming mechanism of honeycomb-like zinc aluminate porous ceramics

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2025-05-28 DOI:10.1111/ijac.15179

Xiaoli Mei, Jianying Hao, Qi Liu, Zhenguo Zhu, Shuo Bai, Fuyan Wang

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Abstract

Porous ceramics have potential practical significance. The honeycomb-like zinc aluminate (ZnAl₂O₄) porous ceramics were successfully prepared using bauxite and zinc oxide as raw materials and soluble starch as pore-forming agent at 1250°C. The effects of different starch contents on the phase composition, mechanical properties, and microstructure of porous ceramics were systematically investigated. The starch is evenly dispersed in the powder mixture and filled in the space between the particles. When the starch content increases, the starch oxidizes and decomposes at high temperature to form some large pores, and the pores may be turned to honeycomb-like structure under the action of surface tension at the grain boundaries. When 40% starch is added, the prepared ZnAl₂O₄ ceramics have better comprehensive performance, 49.37% of apparent porosity, 2.19 g·cm⁻³ of bulk density, and 8.7 MPa and 19.23 MPa of flexural and compressive strength.

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蜂窝状铝酸锌多孔陶瓷的制备及其形成机理

多孔陶瓷具有潜在的实用意义。以铝土矿和氧化锌为原料，可溶性淀粉为成孔剂，在1250℃下成功制备了蜂窝状铝酸锌（ZnAl2O4）多孔陶瓷。系统研究了不同淀粉含量对多孔陶瓷相组成、力学性能和微观结构的影响。淀粉均匀地分散在粉末混合物中，并填充在颗粒之间的空间中。当淀粉含量增加时，淀粉在高温下氧化分解形成一些较大的孔隙，这些孔隙在晶界处表面张力的作用下可能转变成蜂窝状结构。当淀粉添加量为40%时，制备的ZnAl2O4陶瓷具有较好的综合性能，表观孔隙率为49.37%，容重为2.19 g·cm−3，抗折强度为8.7 MPa和19.23 MPa。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;