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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

高性能β″-Al2O3陶瓷压型粉料的制备

樊增钊; 顾中华; 陈昆刚; 徐孝和   

  1. 中国科学院上海硅酸盐研究所; 上海 200050
  • 收稿日期:1998-03-20 修回日期:1998-04-14 出版日期:1999-02-20 网络出版日期:1999-02-20

Preparation of Forming Powders of High Quality β

FAN Zeng-Zhao; GU Zhong-Hua; CHEN Kun-Gang; XU Xiao-He   

  1. Shanghai Institute oOf Ceramics; Chinese Academy of Sciences Shanghai 200050 China）;
  • Received:1998-03-20 Revised:1998-04-14 Published:1999-02-20 Online:1999-02-20

PDF (PC)

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摘要： 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．

关键词: β″-Al2O3, 压型粉料, 喷雾干燥

Abstract: 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%.

Key words: β’’-Al2O3, forming powder, spray drying

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