陶瓷零件低温挤压自由成形工艺挤压过程及液相迁移

水基陶瓷膏体低温挤压自由成形过程中，液相迁移对挤压过程和成形件的性能有重要影响。将挤压过程分为压实阶段、过渡阶段及稳定挤压阶段，基于Benbow-Bridgwater模型推导出各阶段的挤压力方程。采用单因素试验法研究了挤出速度、间隔时间和挤出喷嘴直径对水基陶瓷膏体挤压过程中液相迁移的影响。试验结果表明，增大挤压速度，采用大直径挤出喷嘴，缩短间隔时间，均能有效减小挤压过程中的液相迁移，提高成形质量。

Liquid Phase Migration and Freeze-form Extrusion Fabrication of Aqueous Ceramic Paste

During the aqueous ceramic paste freeze-form extrusion fabrication process, liquid phase migration had important effects on extrusion proces and the part performances. The extrusion process was divided into 3 stages, i.e.compaction stage, transition stage and stable extrusion stage. The extrusion pressure equation which included the shear forces between the barrel inner wall and the extrusion paste was derived based on Benbow-Bridgwater model. The influences of extrusion speed, interval time and nozzle diameter on liquid phase migration were studied attentively through single factor experiments. The results show that the longer interval time, the more serious the liquid phase migration, the higher extrusion speed and the bigger diameter of extrusion nozzle may reduce liquid phase migration and improve the forming efficiency.