纳米Al_2O_3/GdAlO_3共晶陶瓷复合粉体的醇-水加热法制备与表征

Preparation and Characterization of Nano-sized Al_2O_3/GdAlO_3 Eutectic Ceramics Composite Powders by Alcohol-aqueous Heating Method

为制备分散均匀的纳米尺度的共晶陶瓷复合粉体,采用Al（NO3）3·9H2O和Gd2O3作为原材料,通过醇-水加热法制备了纳米尺度的Al2O3/Gd AlO3共晶成分陶瓷粉体。研究了溶液初始浓度配比和pH值等对复合粉体粒径的影响。通过SEM、TEM、FT-IR和BET N2吸附法等手段表征了前驱体颗粒大小和分散性,确定最佳的前驱体制备工艺,对前驱体进行煅烧制得Al2O3/Gd AlO3复合陶瓷粉体。结果表明,前驱体粒径和分散性受制备工艺影响较大;特别是,最佳工艺制备的前驱体平均粒径20 nm,分散性良好,形貌多呈球形;1250℃煅烧后得到的Al2O3/Gd AlO3共晶陶瓷粉体的晶化良好、成分均匀,粉体粒径100~200 nm。

In order to prepare nano-sized ceramic powders with eutectic composition,nano-sized Al2O3/Gd AlO3 eutectic composite ceramic powders were prepared using Al（ NO3）3·9H2O and Gd2O3 as the raw materials,through heating of alcohol-aqueous solutions. The influence of initial concentration of aqueous salt solutions and pH values on the sizes and the morphologies of the resulting particles was investigated. The best preparation process was determined by means of SEM,TEM,FT-IR,BET N2 adsorption method to characterize the precursor particle size and dispersion. These precursor powders were calcined at the temperature range from 1050 ℃ to 1250 ℃,and then the as-prepared Al2O3/Gd AlO3 composite ceramic powders were characterized. The obtained results show that the preparation process has a great influence on the particle average size and dispersion of the precursor; especially with the best preparation process,well dispersed and spherical particle can be obtained,and its average particle size reaches the 20 nm. After 1250 ℃ calcination,these resulting particles are crystallized well and have good uniformity of composition with a particle size of 100 nm to 200 nm.