Abstract: The preparation methods of aerogel fiber composites and its application in pipe and wall insulation area are mainly reviewed. The preparation methods are divided into two categories. One is that aerogel particles are added into the fiber. They can be added in the spinning solution or masterbatch, and they can also be added between the procedure of net forming and reinforcement, or in the process of post finishing. The other is that fibers were added in the sol-gel stage. The added fibers can be divided into short fibers, long fibers, fiber membrane fragments, and fiber preforms according to its pattern. They can be divided into inorganic fibers and organic fibers according to its types. When it was used in the insulation fields such as pipe and walls, the thickness of SiO₂ aerogel felt/board is smaller than half that of traditional insulation materials, and the energy saving rate is higher. The combination with aerogels and traditional insulation materials can effectively reduce the cost.

Key words: SiO₂ aerogel, aerogel felt, aerogel modified fibers, fiber-reinforced aerogel, thermal insulation, building energy-saving