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Alumina continuous fibers are among the most important ceramic fibrous materials due to their exceptional properties, including high strength and modulus, excellent high-temperature resistance, chemical inertness in both oxidizing and reducing atmospheres (even at elevated temperatures), resistance to non-oxide material corrosion, superior electrical insulation, and low thermal conductivity. These fibers—stiff yet flexible, round, dense, smooth, transparent, and chemically resistant—enable many unique applications. Consequently, their preparation and applications have attracted significant attention in recent years, with remarkable progress being made. The primary methods for preparing alumina ceramic continuous fibers include slurry spinning, polymer precursor processing, and sol-gel spinning. However, the slurry method faces challenges in producing high-strength alumina fibers. In contrast, the polymer precursor and sol-gel processes yield excellent alumina continuous fibers. Among these, the sol-gel method stands out due to its adjustable composition, relatively moderate preparation conditions, and low cost, making it the dominant commercial production method for alumina ceramic continuous fibers. The mechanical performance and thermal resistance of these fibers are significantly influenced by their chemical composition and microstructure. Depending on these factors, the fibers exhibit tensile strengths ranging from 1.5 GPa to 3.1 GPa and long-term service temperatures between 1000 °C and 1300 °C. Therefore, careful selection is necessary according to the unique circumstances and conditions involved in the use and processing of the alumina fibers. This chapter focuses on high-performance alumina continuous fibers with practical value, particularly emphasizing the preparation, microstructure, and properties of commercial polycrystalline alumina continuous fibers. The discussion aims to serve as a reference for selecting alumina continuous fibers in real-world applications and guiding the development of novel fibers.

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Polycrystalline Alumina Continuous Fibers: Processing, Microstructure, and Properties

  • 动态工具书词条

  • 发表日期：

    2026年

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  • Xiuling Jiao,
  • Dairong Chen

摘要

Alumina continuous fibers are among the most important ceramic fibrous materials due to their exceptional properties, including high strength and modulus, excellent high-temperature resistance, chemical inertness in both oxidizing and reducing atmospheres (even at elevated temperatures), resistance to non-oxide material corrosion, superior electrical insulation, and low thermal conductivity. These fibers—stiff yet flexible, round, dense, smooth, transparent, and chemically resistant—enable many unique applications. Consequently, their preparation and applications have attracted significant attention in recent years, with remarkable progress being made. The primary methods for preparing alumina ceramic continuous fibers include slurry spinning, polymer precursor processing, and sol-gel spinning. However, the slurry method faces challenges in producing high-strength alumina fibers. In contrast, the polymer precursor and sol-gel processes yield excellent alumina continuous fibers. Among these, the sol-gel method stands out due to its adjustable composition, relatively moderate preparation conditions, and low cost, making it the dominant commercial production method for alumina ceramic continuous fibers. The mechanical performance and thermal resistance of these fibers are significantly influenced by their chemical composition and microstructure. Depending on these factors, the fibers exhibit tensile strengths ranging from 1.5 GPa to 3.1 GPa and long-term service temperatures between 1000 °C and 1300 °C. Therefore, careful selection is necessary according to the unique circumstances and conditions involved in the use and processing of the alumina fibers. This chapter focuses on high-performance alumina continuous fibers with practical value, particularly emphasizing the preparation, microstructure, and properties of commercial polycrystalline alumina continuous fibers. The discussion aims to serve as a reference for selecting alumina continuous fibers in real-world applications and guiding the development of novel fibers.