陶瓷热压铸成型的超临界CO_2流体脱蜡  

SUPERCRITICAL CARBON DIOXIDE DEWAXING FOR LOW-PRESSURE INJECTION MOLDING OF CERAMICS

作　　者：吴音[1] 司文捷[1] 金元生[2] 苗赫濯[1] 于恩平[3] 

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 [3]北京化工大学化工系,北京100029

出　　处：《硅酸盐学报》2003年第6期586-590,共5页Journal of The Chinese Ceramic Society

基　　金：国家重点基础研究发展规划 (G2 0 0 0 672 0 32 )资助项目

摘　　要：利用超临界CO2 流体萃取技术从陶瓷热压铸成型坯体中萃取有机粘合剂。对陶瓷热压铸成型中所使用的有机载体组分进行研究 ,对陶瓷热压铸成型超临界CO2 流体脱蜡工艺条件进行了探索。研究了陶瓷坯体厚度、萃取压力 ,温度及时间对萃取率和陶瓷坯体脱蜡质量的影响。结果表明 :由 60 % (质量分数 ,下同 )非极性分子石蜡 (熔点 5 7℃ )和 40 %极性分子蜂蜡 (熔点 5 8℃ )组成的混合蜡作为热压铸浆料的有机载体 ,在压力为 30MPa ,温度为 45℃的超临界CO2 流体中脱脂可获得无缺陷的陶瓷热压铸成型生坯 ,脱蜡时间从 34h减少到 3h。由超临界CO2The supercritical extraction with carbon dioxide was used to remove wax from low-pressure injection-molded ceramic green parts. The composition of organic additives for low-pressure injection molding feedstocks was studied. The extraction condition of low-pressure injection-molded ceramic green parts was investigated. The results show that the wax in low-pressure injection molding feed-stocks containing 60% (in mass, same below) paraffin wax and 40% bee wax is recommended. The efficient extraction condition for supercritical CO2 fluid dewaxing from low-pressure injection-molded ceramic green parts is as follows: pressure of 30 MPa and temperature of 45°C, under which defect free ceramic green parts can be obtained. The dewaxing time is reduced greatly from 34 h to 3 h. Moreover the sintered samples dewaxed by supercritical CO2 is characterized by higher density and less distortion.

关 键 词：陶瓷 热压铸成型 脱蜡 超临界二氧化碳流体 石蜡 

分 类 号：O614.33[理学—无机化学] TQ567[理学—化学]