本工作研究了β″-Al2O3陶瓷压型粉料的化学组成；制备方法对其密度、电导及显微结构的影响．与水基料浆喷雾干燥相比，酒精基料浆稳定性好，易于调制，其喷雾干燥粉料收获率高，化学组成均匀，耐大气湿气性好，粉体颗粒可在较低压力下被压碎，生坯压实密度较高．采用Li2O－Al2O3和Na2O－Al2O3混合物的高温煅烧产物为组元，配成化学组成为0.69～075wt％Li2O，8．85～9．10wt％Na2O，其余为Al2O3的酒精基料浆喷雾干燥粉料，可获得密度、电导和显微结构俱佳的高性能β″-Al2O3陶瓷．
The influences of chemical composition and fabrication technology of forming powders on sintering density, Na-ion conductivity
and microstructure of β’’-Al2O3 ceramics were investigated. Compared with water-based slurry, ethanol-based slurry was more stable
and could be prepared more easily. Moreover, the latter had better stability to moisture and chemical homogeneity, and the agglomerates
could be crushed at a lower pressure. Thus, higher green densities could be obtained. High quality β’’-Al2O3 ceramics with densities
>3.23g·cm-3, and resistivities of 5～6Ω·cm at 300℃ and homogeneous microstructures were prepared with such powder spray dried from ethanol-based
slurry which was composed of two components, namely Li2O-Al2O3 and Na2O-Al2O3 calcinated at 1250℃ for 2h. respectively. The
contents of Li2O and Na2O in the resulting powders were variable in the ranges of 0.69～0.75wt% and 8.85～9.10wt%.
参考文献
| [1] | 樊增钊，陈昆刚，徐孝和，硅酸盐学报， 1989， 17(3): 278--282 2 陈昆刚，樊增钊等，第二十届全国化学与物理电源会议论文集，成都, 1992. 113 樊增钊，顾中华，第七届全国固态离子学学术会议论文集，成都, 1994. 9. 58?4 Davicl W Jhnson, Selie M. Granstaff, Warren W. Rhodes. Amer. Ceram. Soc. Bull., 1979, 58 (9): 849--853 |
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