期刊
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
卷 19, 期 5, 页码 2489-2499出版社
WILEY
DOI: 10.1111/ijac.14078
关键词
Al2O3-SiO2-system; porous mullite ceramics; dielectric properties; radome application
资金
- National Natural Science Foundation of China [51772062]
Integrated porous Al2O3-SiO2 ceramics were successfully prepared for load-bearing/wave-transmitting applications, with controlled mullite whisker morphology. The prepared ceramics exhibit high strength, high porosity, and good dielectric properties.
Ceramics from porous Si3N4 and its derivatives SiAlON and Si2N2O were once considered the most promising high-temperature wave-transmitting materials. However, their large-scale application in the field of radomes is greatly restricted due to their poor oxidation resistance, high preparation costs, and expensive raw materials. Therefore, the development of low-cost porous oxide ceramics remains of significant interest to the field of high-temperature wave transmission. Surprisingly, mullite ceramics, which are representative of the Al2O3-SiO2-system of ceramics, are ultra-low-cost materials with the potential to replace ceramics from Si3N4 and its derivatives. In this paper, integrated porous Al2O3-SiO2-system ceramics were successfully prepared for load-bearing/wave-transmitting applications, using inexpensive calcined kaolin and alumina powder as the main raw materials. Calcined kaolin can provide seeds for the growth and development of mullite crystals in the ceramic system. High-strength and high-porosity ceramics were obtained with the mullite morphology controlled through the molar ratio of Al2O3 to SiO2 and the resulting content of mullite seeds. With increasing of mullite seed content, the length and radial width of mullite whiskers with interlocking structure gradually change from rod-shaped long and thick to needle-like short and thin. The prepared porous Al2O3-SiO2 ceramics have high flexural strength, fracture toughness, and good dielectric properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据