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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

凝胶注模成型延迟固化研究

戴春雷, 杨金龙, 黄勇   

  1. 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室, 北京 100084
  • 收稿日期:2003-12-01 修回日期:2004-03-15 出版日期:2005-01-20 网络出版日期:2005-01-20

Investigation on Delay Solidification for Gelcasting

DAI Chun-Lei, Yang Jin-Long, HUANG Yong   

  1. Department of Materials Science & Engineering, State Key Lab of New Ceramics & Fine Processing,Tsinghua University, Beijing 100084, China
  • Received:2003-12-01 Revised:2004-03-15 Published:2005-01-20 Online:2005-01-20

PDF (PC)

1396

被引次数

49

摘要： 凝胶注模成型工艺中, 为了延长操作时间, 通常希望陶瓷浆料能延迟固化, 即延长浆料的聚合诱导期. 传统的方法是通过调节催化剂、引发剂的用量以及控制浆料的温度来实现这一目的. 本文研究了其它各种延长诱导期的方法, 包括改变浆料pH值、增加浆料中离子强度、加入阻聚剂等. 研究发现, 浆料中离子强度较高会使固化延迟; 浆料pH?值偏酸或偏碱, 诱导期会急剧增加; 加入适当的阻聚剂在不同温度下都可以使浆料延迟固化.

关键词: 凝胶注模成型, 诱导期, 离子强度, 阻聚剂

Abstract: In order to get enough operating time in gelcasting processing, we hope ceramic slurry delay solidification. Idle time commonly is postponed by decreasing slurry temperature and the
amount of initiator and catalyst. In this paper, other ways were studied. The heat evolution of the slurry was measured to characterize the
polymerization process. Results show that increasing ionic strength can delay polymerization reaction. Idle time is shortened when pH of slurry
decreased but mounted up rapidly when pH of slurry is under 1.7. Various inhibitors have different inhibit effect on polymerization under different
temperatures. Composite inhibitor of phenothiazine and catechol can delay solidification of ceramic slurry effectively under 20～60℃.

Key words: gelcasting, idle time, ionic strength, inhibitor

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