Preparation of nano-Al_2O_3-coated ZrO_2 modified by silane coupling agent

摘要

Core-shell nano-Al_2O_3-coated ZrO_2 materials were prepared via a liquid co-deposition method using ZrO_2 as cores. Surface of ZrO_2 was modified by silane coupling agent. The mechanism of A-151[CH_2=CH-Si-(OC_2H_5)_3] was studied under the condition of HAc. The composite powders were characterized by FT-IR, TEM, EDS and SEM. TEM observation confirmed that amorphous Al_2O_3 layer deposited on the surface of ZrO_2 and the thickness of the Al_2O_3 coating ranged from 5 to 10 nm. After sintered at 1650°C for 10 h, the size distribution narrowed down and the compactness of composite sintered body was better in comparison with pure zirconia.