陶瓷注射成型超临界CO_2流体脱脂工艺研究

Supercritical Carbon Dioxide Debinding for Injection Molding of Ceramics

利用超临界CO_2流体萃取技术从陶瓷注射成型坯体中萃取有机粘合剂。对陶瓷注射成型中所使用的有机载体组分进行研究,对陶瓷注射成型超临界CO2流体脱脂的工艺条件进行了探索,研究了不同萃取压力,温度及时间对萃取率和陶瓷坯体脱脂质量的影响。结果显示利用40%～50%(质量分数,下同)非极性分子有机物石蜡(PW)与30%～40%极性分子有机物聚丙烯(PP)及20%硬脂酸(SA)组成陶瓷注射成型熔体中的有机载体,在压力P=30MPa,温度T=58℃的超临界CO2流体中脱脂可在较短的时间内获得无缺陷的陶瓷注射成型生坯。

Supercritical extraction with carbon dioxide was used to remove the binder from injection-molded ceramic green parts. The composition of organic additives for injection molding feedstocks was studied. The extraction condition of injection-molded ceramic green parts was investigated. The results show that the binder in injection molding feedstocks containing 40wt% similar to 50wt% paraffin wax, 30wt% similar to 40% polypropylene and 20% stearic acid is recommended. The efficient extraction condition for supercritical CO2 fluid debibding from injection-molded ceramic green parts are at 30MPa and 58degreesC under which the defect-free ceramic green parts can be obtained in short time as compared to the thermal debinding method.