Abstract:

A specific size of fir flour was treated with 20% NaOH solution，and fir flour/ZrO₂ hybrid material was prepared by the hydrothermal method using ZrOCl₂•8H₂O as inorganic precursor.Porous ZrO₂ ceramics was obtained after the hybrid material was treated at 800℃ in air.The morphology，micro structure and properties of the alkaline treated fir flour，hybrid material and ZrO₂ ceramics were analyzed by FESEM，FTIR，XRD and TGA.The results showed that cross-porous network structure of the tracheid and pit of fir flour were clear.The hydrogen bonds in cellulose were broken partly and the crystallinity of cellulose decreased，which caused an increase in reaction activity of cellulose.Under the hydrothermal condition，inorganic precursor was infiltrated into the tracheid and pit of fir flour.The hydroxyl groups from the hydrolysis of ZrOCl₂ reacted with the hydroxyl groups of the fir flour and interpenetrating network micro structure of the hybrid material was lastly formed.The decomposition temperature increased from 282℃ for fir flour to 298℃ for the hybrid material.The porous ZrO₂ ceramics had cage-like structure and the diameter of the pore was about 10—20 μm.