硬脂酸表面改性对PLZT压电陶瓷粉末注射成型性能的影响  

Surface Modification by Stearic Acid on Property of PLZT Piezoelectric Ceramics Prepared via Powder Injection Molding

作　　者：吴盾 秦帅 刘春林 方必军 曹峥 成骏峰 WU Dun;QIN Shuai;LIU Chun-Lin;FANG Bi-Jun;CAO Zheng;CHENG Jun-Feng(School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials,Changzhou 213164,China;Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering,Changzhou 213164,China;Huaide College,Changzhou University,Jingjiang 214500,China)

机构地区：[1]常州大学材料科学与工程学院,常州213164 [2]常州大学怀德学院,靖江214500 [3]江苏省光伏科学与工程协同创新中心,常州213164 [4]江苏省环境友好高分子材料重点实验室,常州213164

出　　处：《无机材料学报》2019年第5期535-540,共6页Journal of Inorganic Materials

摘　　要：以硬脂酸为粉末改性剂,聚乙二醇/聚乙烯醇缩丁醛/聚甲醛(PEG/PVB/POM)为粘结剂体系制备锆钛酸铅镧(PLZT)粉末注射成形喂料,并通过先水脱脂后烧结的工艺制备了PLZT压电陶瓷。研究了硬脂酸用量对粉末特性、喂料黏度、水脱脂率以及坯体强度的影响,并对烧结后陶瓷的微观形貌与电性能进行对比与分析。结果表明:硬脂酸通过湿法改性成功包覆于PLZT粉体表面,硬脂酸改性打破了粉末间的团聚,且当硬脂酸包覆量为2wt%时,喂料具有较低的剪切黏度及较高的坯体弯曲强度。但过量改性反而使得喂料黏度上升,坯体弯曲强度下降。改性后的粉体在坯体内分散均匀,烧结后的陶瓷晶粒生长完善,具有更大的烧结致密度。与未改性的PLZT陶瓷相比,在2 kV/mm极化电压下, 2wt%硬脂酸改性的PLZT的压电常数d_(33)由638 pC/N提高为682 pC/N。A powder injection molding feedstock of lead zirconate titanate (PLZT) was successfully prepared using stearic acid as powder modifier and polyethylene glycol/polyvinyl butyral/polyoxymethylene (PEG/PVB/POM) as binder system. Then, PLZT piezoelectric ceramics were prepared by degreasing and post-sintering processes. The effects of stearic acid (SA) dosage on powder properties, feedstock viscosity, water degreasing rate and green body strength were studied. The microstructure and electrical properties of the sintered ceramics were compared and analyzed. The results showed that stearic acid was successfully coated onto the PLZT powder by wet modification. The modification of stearic acid broke the agglomeration between the powders, and when the amount of stearic acid was 2wt%, the feedstock had a lower shear viscosity and a higher green body bending strength. However, excessive modification caused the feed viscosity to increase and the bending strength of the green body to decrease. The modified powder was uniformly dispersed in the body, and the sintered ceramic had higher density with well grown grains. As compared to the unmodified sample, the piezoelectric constant d33 of the PLZT modified with 2wt% SA increased from 638 pC/N to 682 pC/N.

关 键 词：硬脂酸 粉末改性 PLZT 注射成型 压电性能 

分 类 号：TF124[冶金工程—粉末冶金]