利用建筑废弃物原位合成莫来石晶须增强的高声吸性能多孔陶瓷的制备与性能

Preparation and Properties of High Sound-Absorbing Porous Ceramics Reinforced by In Situ Mullite Whisker from Construction Waste.

作者信息

Hua Kaihui, Chen Xiaobing, Shui Anze, Xi Xiuan, Gao Pinhai, Zheng Yu, He Chuncan

机构信息

School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China.

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.

出版信息

Molecules. 2024 Jul 21;29(14):3419. doi: 10.3390/molecules29143419.

DOI:10.3390/molecules29143419

PMID:39064998

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11279600/

Abstract

Porous sound absorption ceramic is one of the most promising materials for effectively eliminating noise pollution. However, its high production cost and low mechanical strength limit its practical applications. In this work, low-cost and in situ mullite whisker-reinforced porous sound-absorbing ceramics were prepared using recyclable construction waste and AlO powder as the main raw materials, and AlF and CeO as the additives, respectively. The effects of CeO content, AlF content, and sintering temperature on the microstructure and properties of the porous ceramics were systematically investigated. The results showed that a small amount of CeO significantly promoted the growth of elongated mullite crystals in the resultant porous ceramics, decreased the growth temperature of the mullite whiskers, and significantly increased the biaxial flexural strength. When 2 wt.% CeO and 12 wt.% AlF were added to the system, mullite whiskers were successfully obtained at a sintering temperature of 1300 °C for 1 h, which exhibited excellent properties, including an open porosity of 56.4 ± 0.6%, an average pore size of 1.32-2.54 μm, a biaxial flexural strength of 23.7 ± 0.9 MPa, and a sound absorption coefficient of >0.8 at 800-4000 Hz.

摘要

多孔吸声陶瓷是有效消除噪声污染最具前景的材料之一。然而，其高生产成本和低机械强度限制了其实际应用。在本工作中，以可回收建筑垃圾和氧化铝粉末为主要原料，分别以氟化铝和氧化铈为添加剂，制备了低成本且原位莫来石晶须增强的多孔吸声陶瓷。系统研究了氧化铈含量、氟化铝含量和烧结温度对多孔陶瓷微观结构和性能的影响。结果表明，少量的氧化铈显著促进了所得多孔陶瓷中细长莫来石晶体的生长，降低了莫来石晶须的生长温度，并显著提高了双轴弯曲强度。当向体系中添加2 wt.%的氧化铈和12 wt.%的氟化铝时，在1300℃烧结1 h成功获得了莫来石晶须，其表现出优异的性能，包括开孔率为56.4±0.6%，平均孔径为1.32 - 2.54μm，双轴弯曲强度为23.7±0.9 MPa，在800 - 4000 Hz时吸声系数>0.8。