ZrO_2陶瓷注射成型超临界CO_2流体脱脂动力学研究  

STUDY ON KINETICS FOR SUPERCRITICAL CO_2 DEBINDING OF INJECTION MOLDED ZrO_2 CERAMICS

作　　者：吴音[1] 司文捷[1] 金元生[2] 苗赫濯[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《硅酸盐学报》2004年第2期134-138,共5页Journal of The Chinese Ceramic Society

基　　金：国家重点基础研究发展规划(G200067203-2)资助项目

摘　　要：用传统扩散方程建立了描述ZrO2陶瓷注射成型超临界流体脱脂过程的传质模型,研究分析了陶瓷注射成型超临界流体脱脂行为和脱脂的动力学过程。研究结果表明:有机粘合剂的溶解和扩散是陶瓷注射成型超临界脱脂过程关键因素,其中扩散为控制步骤。当脱脂时间足够长,模型计算曲线与实验结果吻合。通过实验数据,利用简单的理论模型可以得到相应的扩散系数。利用传质模型可以预测陶瓷注射成型超临界脱脂过程传质速率和萃取动力学。Classical diffusion equation was used to describe the mass transfer of supercritical CO2 debinding of the injection molded ZrO2 ceramics. The behavior and kinetics of the debinding were studied and analyzed. Results show that the solubility and diffusivity of soluble binder are the key factors in supercritical CO2 debinding, while the diffusivity is a dominant factor. The calculation data from the theoretical model are consistent with the experiment under the condition of enough long debinding time. It is shown that the diffusivity can be obtained by simple theoretical model combined with experimental data. The extraction rate and the extraction kinetics of the process can be predicted using the theoretical model.

关 键 词：陶瓷注射成型 超临界二氧化碳流体 脱脂 动力学 

分 类 号：O614.33[理学—无机化学] TQ567[理学—化学]