氮化硅陶瓷直接凝固注模成型的凝固动力学

无机材料学报

氮化硅陶瓷直接凝固注模成型的凝固动力学

刘学建¹; 黄莉萍¹; 古宏晨²; 徐鑫¹; 符锡仁¹

1. 中国科学院上海硅酸盐研究所, 上海 200050; 2. 华东理工大学技术化学物理研究所, 上海 200237

收稿日期:1999-10-14 修回日期:1999-11-22 出版日期:2000-10-20 网络出版日期:2000-10-20

Solidification Kinetics of Silicon Nitride Suspension by Direct Coagulation Casting

LIU Xue-Jian¹; HUANG Li-Ping¹; GU Hong-Chen²; XU Xin¹; FU Xi-Ren ¹

1.Shanghai Institute of Ceramic; Chinese Academy of Science; Shanghai 200050; China; 2.East China University of Science & Technology; Shanghai 200237; China

Received:1999-10-14 Revised:1999-11-22 Published:2000-10-20 Online:2000-10-20

摘要/Abstract

摘要： 直接凝固注模成型（ＤＣＣ）是一种新的近净尺寸陶瓷成型工艺；它是通过可控制反应速率的酶催化反应来实现浆料原位固化的．本文将悬浮体流变学与陶瓷浆料的成型工艺学有机结合，通过陶瓷浆料的动态弛豫实验，研究了Ｓｉ_３Ｎ_４浆料ＤＣＣ成型的凝固动力学．结果表明：“凝固时间”可以成功地描述陶瓷浆料的凝固过程，动态弛豫实验为陶瓷浆料的凝固动力学提供了一条简便可行的研究方法．在Ｓｉ_３Ｎ_４浆料ＤＣＣ成型工艺条件优化的基础上，制备出了气孔分布均匀的Ｓｉ_３Ｎ_４坯体．

关键词: 氨化硅, 直接凝固注模成型, 凝固动力学

Abstract: Direct coagulation casting (DCC) is a novel-net-shape method for forming ceramic green bodies, which is based on the principle of the in-situ coagulation of a
powder suspension via a reaction-rate-controlled enzyme-catalyzed reaction after casting. Combining the rheology with the shape-forming technology of ceramic suspension,
the coagulation kinetics of silicon nitride suspension for DCC forming were investigated. The experimental results indicate that the coagulation kinetics can be successfully
studied by the dynamic relaxation experiments in terms of “coagulation time”, which provides a convenient and practicable way to research the coagulation kinetics of
ceramic suspension. After optimizing the processing conditions of the silicon nitride suspension for DCC forming, a green body with uniform, narrow and unimodal pore size distribution was prepared.

Key words: silicon nitride, direct coagulation casting, solidification kinetics

中图分类号:

O648

刘学建,黄莉萍,古宏晨,徐鑫,符锡仁. 氮化硅陶瓷直接凝固注模成型的凝固动力学[J]. 无机材料学报.

LIU Xue-Jian,HUANG Li-Ping,GU Hong-Chen,XU Xin,FU Xi-Ren. Solidification Kinetics of Silicon Nitride Suspension by Direct Coagulation Casting[J]. Journal of Inorganic Materials.

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