无机材料学报

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挤出成型用喷雾造粒氧化铝粉料

丁祥金; 张继周; 李静健; 王若钉; 冯楚德   

  1. 中国科学院上海硅酸盐研究所功能陶瓷工程中心 上海 200050
  • 收稿日期:2000-10-13 修回日期:2000-12-18 出版日期:2001-11-20 网络出版日期:2001-11-20

Spray-Dried Alumina Granules for Extrusion

DING Xiang-Jin; ZHANG Ji-Zhou; LI Jing-Jian; WANG Ruo-Ding; FENG Chu-De   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2000-10-13 Revised:2000-12-18 Published:2001-11-20 Online:2001-11-20

摘要: 用氧化铝溶胶为结合剂,采用喷雾干燥技术制备球形粉料.粉料形貌受干燥热空气的温度和颗粒尺寸的影响,降低空气温度和减小颗粒尺寸有利于获得具有完整球形的粉料.造粒的粉料;分别经800~1600℃煅烧得到不同热处理的粉料.用XRD,TG-DTA分析了氧化铝溶胶和造粒粉料的相组成和相变化,SEM观察了粉料形貌,单侧加压干压法评估了粉料抗破坏性,结果表明,氧化铝溶胶不仅起到常规粘合剂的作用,而且对喷雾造粒的氧化铝颗粒起到促烧结作用,使粉料经1200~1300℃的低温煅烧下即可获得良好的抵抗外力破坏能力,适用于挤出成型制备多孔支撑体。

关键词: 氧化铝溶胶, 喷雾干燥, 氧化铝, 粉料

Abstract: Alumina granules were prepared by spray-drying technique with alumina-sol as the binder. The granule morphology is influenced by inlet temperature and the granule
size. The decrease of inlet temperature and granule size benefits the granule morphology perfectible. Spray-dried granules were calcined at 800~1600℃,
respectively. XRD and TG-DTA were carried out to analyze the phases of alumina-sol and granules. SEM was used to observe the granules calcined at different temperatures. The strength
of granules was tested by the die pressing method. The results show that the alumina-sol not only acts as a common binder at room temperature but also improves the sintering behaviors of α-alumina, so as to
make granules get good strength for extrusion as low as 1200~1300℃.

Key words: alumina-sol, spray-drying, alumina, granule

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