水溶性脱脂粉末注射成型制备PLZT压电陶瓷及其压电性能

Preparation and Piezoelectric Properties of PLZT Piezoelectric Ceramic by Water-soluble Degreasing Powder Injection Molding

以聚乙二醇（PEG）为水溶性脱脂树脂、聚乙烯醇缩丁醛（PVB）/聚甲醛（POM）为粉末包覆及保型树脂,研究了水溶性脱脂粉末注射成型（PIM）制备锆钛酸铅镧（PLZT）压电陶瓷的工艺流程及黏结剂配比对注射成型喂料（简称喂料）脱脂率、流变行为的影响。用扫描电子显微镜观察了脱脂坯的微观形貌,通过热重分析确定烧结条件,研究了陶瓷的压电性能。结果表明：当黏结剂配比（质量比）为PEG：PVB：POM=6：2：2时（固含量50%）,喂料具有较高的生坯强度和较低的黏度,PEG脱除速率快。脱脂坯以2℃/min升温至1 285℃完成烧结,与压制成型相比,PIM法制备的PLZT陶瓷晶粒生长更完善,尺寸均匀且致密度高,压电性能优异。

Lead lanthanum zirconate titanate（PLZT） piezoelectric ceramic was prepared by water-soluble defatted powder injection molding（PIM） with polyethylene glycol（PEG） as a water-soluble degreasing resin and polyvinyl butyral（PVB）/polyoxymethylene（POM） as powder coating and preservative resin. The effect of binder ratio on the feed rate and rheological behavior was investigated. The morphology of the degreased pellets was determined by scanning electron microscopy. The sintering conditions were determined by thermogravimetric analysis, and the piezoelectric properties of the sintered ceramic were investigated. The results show that when the binder ratio is PEG：PVB：POM=6：2：2（solid content 50%）, the special material has a higher green strength and a lower viscosity, and the PEG removal rate is the maximum. Compared to compression molding, the PLZT ceramic prepared by the PIM method has better grain growth morphology, uniform grain size, high densification and excellent piezoelectric performance.