Abstract: The composite fiber of ZrO₂ nanocrystal compounded fleece fiber has been prepared from ZrO₂·nH₂O sol and fleece fiber using the sol-soaking and hydrothermal methods.The effects of the state of ZrO,₂ and the particle sizes of ZrO_·nH₂O and ZrO₂ nanocrystal on the ZrO₂ content in the composite fiber have been studied, and the properties of the latter have been measured. Results show that the ZrO₂ nanocrystals have a square phase and the tensile feature of composite fiber is fine.

Key words: ZrO₂ nanocrystal, fleece fiber, composite fiber